Download 1-Service Manual LT3XX RCDT3XX LRCD2XX

Service manual
Loop Testers LT310, LT320 & LT330
RCD Testers RCDT310, RCDT320 & RCDT330
Loop/RCD Testers LRCD200, LRCD210 & LRCD220
Issue 1
6172-901
© Megger Limited
Safety Warnings
Safety Warnings and Precautions must be read
and understood before the instrument is used.
They must be observed during use. Please read
the special hazards for the service engineer
below.
Replacement fuses must be of the correct type and rating. Failure to fit the correctly rated
fuse may result in a safety hazard and may cause damage to the instrument in the event of an
overload.
When connected to a mains supply, the whole of the instrument must be considered
hazardous live. If instrument is open and you are faultfinding, suitable precautions must be
taken.
After tests, the power resistors and heatsink on the power board could be hot.
2
Guide to Fault-Finding
Basic Operation
Switching from OFF will cause the firmware version number to be shown for slightly less
than one second. The backlight (if fitted) will turn on until the display has settled. Normally
the supply voltage will be shown, and a test started by pressing the TEST button.
Pressing the backlight button enables the backlight. The backlight turns off after 20 seconds
to save battery power.
The LT3x0, RCDT3x0 and LRCD2x0 are similar instruments with common circuits and
functions - in fact the PCBs are largely common and instrument's identity is setup in
manufacture/test - the only differences in the PCB Build are in the Power Board
LT
RCDT
LRCD
Fit TR46
(FQA11N90)
Fit TR37
(P6NK90)
Fit TR46
(FQA11N90)
Do not fit TR37
Do not fit TR46
Do not fit TR37
RL2
Fitted
Not Fitted
Fitted
R251
100Ω
91Ω
100Ω
FET
Switch the instrument on by rotating the switch.
The instrument carries out these primary functions. If a fault is suspected, these functions
need to be investigated in this order.
1. Voltage/Frequency Measurement
The voltages between the three terminals are continuously measured. The maximum
voltage is displayed if this is greater than 25V a.c.
The voltages are measured via 10Mohm resistances on the power board, connected before the
fuses, and sampled by the processor. On some instruments, the frequency can also be
displayed.
Note that as the voltages are measured before the fuses, the correct voltage will be displayed
even if the fuse has blown.
2. 'Constant Current Source'
A current source can be connected across the supply to draw between 4.75mA and
1050mA. This is controlled by the microprocessor, and is used to drive a current to trip
RCDs, or to drive a switched current to measure loop resistance.
In general, this current is not there long enough to measure with a multimeter. However, on
an RCD tester the 'a.c. selective' type test can be used, and the test current will flow for 2s.
This current will be nominally 5% higher than the rated current, as EN61557 requires that
this current is never lower than the rated current. The wave shape for the d.c. sensitive test
will confuse most multimeters. The current used to measure loop resistance can never be
3
measured with a multimeter. Never use ‘peak hold’ on the multimeter - they are readily
confused by switching transients.
A resistor and a FET are used, and both or either of these will get hot. The temperature is
measured prior to (and during testing) and the test will be stopped if this is too high.
3. Difference Voltage measurement (Loop Resistance)
To measure the loop resistance of a circuit the difference between the on load and off
load voltages is measured. This is normally done several times and an average taken.
4
Assembly Drawings
Insulator
Fuses
Power Resistors
PCB securing
screws
5
FET
Battery Lead
1
2
4
3
5
Title:
25 Retain with continuous bead of RTV (Item 43)
6
Part No.:
Instrument Assembly
1st Used On: LT/RCDT300 Series & LRCD200 Series
Start/Finish
Ensure no gap
F
Note: LT310
does not have
upper switch fitted
7
41
9
7
8
9
4
19
8
Lower switch shown in OFF position
Apply contact grease (item 17) to pcb
switch pads using Tool AT21372
Use switch assembly nest AT22184
13
Sheet 1 of 2
LT310
LT320
LT330
RCDT310
RCDT320
RCDT330
LRCD200
LRCD210
LRCD220
Note: Upper switch is rotated
180° to lower switch
18
2
6411-095
Scale:- 1:1
F
Apply pressure directly over
legs when pushing into switch
mouldings
E
E
28
Start/Finish
Ensure no gap
26
25
11
4
8
Torque 75Ncm
1
6
2
Use press
AT22178
#
50
10
9
11
10
24
Torque 100Ncm
D
14
2
27
3
#
D
21
8
Do not fit disc & spring to
bottom side of upper switch
26
Torque 30Ncm
Fit after
programming
Use press
AT22179
# Cut hole for USB socket
using Punch AT22181
#
48
5
#
USB socket assembly order:
1. Fit usb cover into terminal panel.
2. Attach usb pcb to main pcb with spacer
3. Rotate usb pcb into usb cover.
4. Screw usb pcb to terminal panel.
4
Silver contacts
this side up
49
Use Heatsink
AT22180 when soldering
wires to sockets
C
Fold 90° on each
crease line
38
4
W1 & W2
Upper Switch Pin Positions
Model
Pin 1
Pin 2
LT310
N/F
N/F
LT320
R
V
LT330
R
V
RCDT310
Q
U
RCDT320
P
V
RCDT330
P
W
LRCD200
Q
V
LRCD210
Q
V
LRCD220
P
V
W
V
U
T
S
R
B
Q
P
A
B
C
D
E
F
G
H
I
O
A
N
M
L
K
J
37
14
2
Torque 75Ncm
3
37
Pass wires through
battery contact holes
and solder in place
Black wire
Red wire
Ensure that switch spiders are correctly
engaged in case top and range knobs
before screwing pcb in place.
25
Ensure no gap
at ends when terminal
panel is fitted
Wipe switch detents with
special plastics grease (Item 16)
Bend battery contact
tabs as shown
B
+
4
Lower Switch Pin Positions
Model
Pin 1
Pin 2
LT310
D
H
LT320
D
I
LT330
D
L
RCDT310
C
H
RCDT320
A
I
RCDT330
A
L
LRCD200
D
J
LRCD210
B
J
LRCD220
B
K
Use front panel nest AT22185
# Fit to LT/RCDT330 only
A
Pins (Item 14) to protrude 2.5mm
Megger Ltd. Archcliffe Road, Dover, Kent CT17 9EN, U.K.
Use Press AT22182, using
plate marked with model name.
DO NOT SCALE
IF IN DOUBT, ASK!
1
2
3
4
THIRD ANGLE
PROJECTION
DIMENSIONS IN MILLIMETRES ISSUE
THIS IS A COMPONENT DRAWING AND THE TOLERANCES SHOWN TOLERANCES UNLESS STATED:
REFER TO THE COMPONENT AND NOT ITS ASSOCIATED TOOLING NOMINAL
0.5
© MEGGER LIMITED
Reproduction in whole or part without prior permission
from the copyright owner is strictly prohibited
A1/E9
C
TO 1 DECIMAL PLACE 0.15
ANGULAR
1
HOLES TO BS4500 H11
5
6
Drawn By: S.D.Clark
DATE
CN No.
11/01/2005
22222
Material:
Date: 23/03/2004
See BOM
Finish:
5
02/07/2004
22058
6
1
12
2
Tri socket
wiring
Note: Keypad type varies between models
Remove protective film from lcd and from
both sides of the window before packing
F
4
3
Black
5
Title:
6
Part No.:
Instrument Assembly
1st Used On: LT/RCDT300 Series & LRCD200 Series
Red
26
Red
Red
Red
W4
W4
W5
Green Green
W6
W7
39
W6
Green
Red
46
3
F
USB PCB
Connection
W3
Battery connection
(W1 & W2)
Black
E
Sheet 2 of 2
LT310
LT320
LT330
RCDT310
RCDT320
RCDT330
LRCD200
LRCD210
LRCD220
W4
W3
6411-095
Scale:- 1:1
E
W6
RCDT320 shown as example.
Note - LT310 uses Case Kit A,
with one range switch.
Green
W5
Pack instrument in blister with lid in position shown
Red
W3
26
Black
D
D
French, German & Spanish
26 For
(or Dutch for LRCD) models fit
language variant label
W7
Green
Fit Sleeve S1 over
W7, starting this end
4
45 Stick to top face of components
in position shown.
C
CARRY CASE & SLEEVE PACKAGING
Place User guide CD (item 105), Warranty card (item 106),
Safety warning sheet (item 112), Certificate of Test (item 44)
and Download Manager CD (item111#) in polythene bag
(item 116) and insert in lid pocket as shown.
104
C
CARTON & BLISTER PACKAGING
102
Place model label
on top face.
113
114
108
B
B
Pack Leads and Carry Strap
(item 20) in this area
109
Ensure blister clips into
c shaped catch on bottom
face of carton.
104
Pack Leads and Carry Strap (item20) in Pouch
A
Place User guide CD (item 105), Warranty card (item 106), Safety warning sheet (item 112),
Certificate of Test (item 44)and Download Manager CD (111#) in a polythene bag on top of the pouch.
104
Place large label & barcode label
on underside.
Megger Ltd. Archcliffe Road, Dover, Kent CT17 9EN, U.K.
115
DO NOT SCALE
IF IN DOUBT, ASK!
THIS IS A COMPONENT DRAWING AND THE TOLERANCES SHOWN
REFER TO THE COMPONENT AND NOT ITS ASSOCIATED TOOLING
© MEGGER LIMITED
Reproduction in whole or part without prior permission
from the copyright owner is strictly prohibited
A1/E9
1
2
107
3
4
DIMENSIONS IN MILLIMETRES
TOLERANCES UNLESS STATED:
NOMINAL
0.5
TO 1 DECIMAL PLACE 0.15
ANGULAR
1
HOLES TO BS4500 H11
5
THIRD ANGLE
PROJECTION
Drawn By: S.D.Clark
ISSUE
DATE
CN No.
6
11/01/2005
22222
5
02/07/2004
22058
Material:
Date: 23/03/2004
See BOM
Finish:
6
A
Disassembly
1. Turn switch to OFF position.
2. Remove four corner screws in the base.
3. Keeping instrument upside down, separate the bottom from the top, taking care not to
damage the battery lead.
4. To remove the printed circuit boards, unplug battery lead and remove the two securing
screws (see picture page 5). Do not remove the screw in the centre of the rotary switch(s)
(unless you want to take the switch apart).
5. Lift the terminal block and the pcbs will follow.
6. Note position of the rotary switch(s) (as shown in picture on page 9) so that it can be
returned to this position for re-assembly.
Note that to retain calibration, the printed circuit boards need to be replaced as a pair.
Re-assembly
1. Ensure that the rotary switch and the knob are both in the ‘OFF’ position.
2. The battery connector can be fitted either way round since positive is the centre pin and
negative is both outer pins.
3. Take care not to trap the battery lead.
4. Do not over tighten the four case screws; they screw into plastic.
Miscellaneous notes
•
Relays and Fuses are fitted only if required, depending on model.
•
Replacement printed circuit board assemblies are available from Megger Sales. These
board pairs are tested, calibrated and set up for specific models.
11
5
4
3
2
1
SK1
Temp TR
Temp R
I Sense
Zero Cross
ZERO CROSS 50%
+5V
0V(A)
0V(D)
-5V
+15V
-15V
Micro
Volts L-N
Volts L-E
Volts N-E
+5V_SWITCHED
ZC SELECT[1..2]
TP283
DIFF OUT
ZC SELECT[1..2]
PL24
3
2
1
ZC1
LOADED
UNLOADED
ZERO
ZERO CROSS SELECT
ZC2
DIFF_SELECT[1..3]
Volts L-N
DIFF_SELECT[1..3]
Volts L-N
Volts L-E
Volts L-E
Volts N-E
Volts N-E
Volts L-E (High Gain)
RANGE A
RANGE B
2nd F A
2nd F B
Volts L-E (High Gain)
DIFF OUT
Volts N-E (High Gain)
DIFF GAIN
Range Switches
TEMP TR
TEMP R
I SENSE
DIFF OUT
Volts L-N Shifted
Volts L-E Shifted
Volts N-E Shifted
RANGE A
RANGE B
2nd F A
2nd F B
I x10
NMI-
Volts L-E
Volts L-E Shifted
Volts N-E
Volts N-E Shifted
DAC x2
I ENABLELOOP TEST
DAC I
SW_OFF
2nd F A
2nd F B
SW OFF
I x10
LEDs
POWER OFF
SW_5V-
NMIKEYS CLK
KEYS LDTEST KEYKEYS DATA
CONF DATA
Volts L-N Shifted
2nd F A
2nd F B
C
LED DATA
LED CLK
Level Shift
Volts L-N
DAC x2
I ENABLELOOP TEST
DAC I
ZERO CROSS 50%
KEYS CLKKEYS LD-
B
RANGE LEDS
RANGE A
RANGE B
LOADED
UNLOADED
ZERO
Differance
+5V
0V(A)
0V(D)
-5V
+15V
-15V
+5V_SWITCHED
0V(S)
RANGE A
RANGE B
Range Switches
DIFF GAIN
Volts N-E (High Gain)
BACKLIGHT
ZERO CROSS
ZERO CROSS SELECT
ZERO CROSS
LOADED
UNLOADED
ZERO
ZERO CROSS SELECT
Differance Circuit
Volts L-N
Volts L-E
Volts N-E
Volts L-E (High Gain)
Volts N-E (High Gain)
TEMP TR
TEMP R
I Sense
SPARE
DAC x2
I ENABLELOOP TEST
DAC I
I x10
L-N FIT
N-E FIT
RELAY N-E
RELAY L-N
1
2
3
Zero Cross
PL25
TP232
TP233
TP234
TP235
TP236
TP237
TP238
TP239
TP240
TP241
TP242
TP243
TP244
TP245
TP246
TP247
TP248
TP249
TP250
TP251
TP252
TP253
TP254
TP255
TP256
TP257
ZC1
ZC2
ZERO CROSS 1
ZERO CROSS 2
0V(S)
TP284
C
D
ZERO CROSS 50%
ZC2
D
Volts L-N
Volts L-E
Volts N-E
Volts L-E (High Gain)
Volts N-E (High Gain)
TEMP TR
TEMP R
I Sense
SPARE
DAC x2
I ENABLELOOP TEST
DAC I
I x10
L-N FIT
N-E FIT
RELAY N-E
RELAY L-N
ZC1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
L-N FIT
N-E FIT
RELAY N-E
RELAY L-N
POWER OFF
SW_5VLED DATA
LED CLK
LED DATA
LED CLK
DIFF_SELECT[1..3]
L-N FIT
N-E FIT
ZC SELECT[1..2]
DIFF_SELECT[1..3]
ZC SELECT[1..2]
RELAY N-E
RELAY L-N
LEDs
Micro
Volts L-N Shifted
B
Volts L-E Shifted
CONF DATA
KEYS DATA
TEST KEY-
Volts N-E Shifted
Keys/Config
Power Supply
KEYS LDKEYS CLK-
Level Shift
SW_OFF
KEYS DATA
CONFIG DATA
NMISW_5V-
SW_5VTEST KEY-
POWER OFF
POWER_OFF
TEST_KEY_POWER_ON
TEST_KEY_POWER_ON
Keys & Config
Power
TEST KEY POWER ON
A
A
<Core Design>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
6270-290
Title
Display Board Block Diagram
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Chris Wedge
Issue
4
3
Size A3
© MEGGER LIMITED
5
4
3
2
1
Date
11-06-04
05-05-04
Sheet 1
CN No.
22036
22007
of 10
5
4
3
TP153
2
+5V
1
TP285
+5V
4
LOADED
TP154
IC50
D
1
2
3
TP157
10.00nF
50.00
5
B
VCC
A
GND
Y
1
2
3
TP265
D
11
C
4
Q
9
Q
8
IC10-2
74HC74
R
Vdd
C5
100.00n
25
IC11-4
4053
INH
XOR GATES
TP21
0V(D)
0 = USE ZERO CROSS
1 = USE ZERO CROSS-
TP288
R43
47.00K
1
0.063
TP22
R45
1.00M
1
0.063
+5V
TP25
IC53-3
0V(D)
3
R49
100.00K
1
0.063
MMBF0201NLT1
1
C81
1.00u
40.00
TP23
TP26
TP290
Vloop AC
SW
13
14
5
IC15-3
4053
D16
LL4148
3
062
11
+
9
SW
PHASE
SENSITIVE
DETECTOR
TP2
0V(S)
IC11-2
4053
x 4.3 GAIN
or x 37.3 GAIN
10.00nF
50.00
0V(A)
7
IC32-2
7
TP29
R51
1
R54
10.00K
1
0.063
R325
1.00K
1
0.063
C
4
6 -
TP28
C121
NF
R324
1.00K
1
0.063
-5V
TP279
C1
47.00n
50.00
R1
5
R47
1.00K
1
0.063
R50
100.00K
1
0.063
TR34
+5V
- Vloop AC 12
2 -
0V(A)
33.00K
0.063
3
+
1
Rg1
8
Rg2
2
-
11
OUT
IC33
AD622AR
REF
V-
TP260
+15V
R59
10.00R
1
0.063
R58
300.00R TP34
1
0.063
0V(A)
TP32
R60
1.00M
1
0.063
TP33
+5V
TP291
10
2
SW
15
C11
100.00n
25.00
062
8
V+
R61
10.00R
1
0.063
R62
1.00M
1
0.063
IC15-1
4053
R63
100.00K
TP37
5
V4
+5V
Volts L-N
Volts L-E
A Volts N-E
Volts L-E (High Gain)
Volts N-E (High Gain)
6
16
C16
100.00n
25
C14
100.00n
25
1
+
IC53-1
-
3
2
TLE2022CD
R56
4.70K
1.00
0.06
NF
+5V
C10
10.00nF
50
0V(A)
0V(S)
0V(A)
C15
100.00n
25
C8
100.00n
25
3
-5V
8
7
A
C9
100.00n
25
0V(D)
C17
100.00n
25
0V(A)
TP159
0V(A)
MEGGER LIMITED
Document Number
LOOP MEASUREMENT
3
6270-290
Title
LOOP MEASUREMENT
-5V
4
<Core Design>
Archcliffe Road, Dover,
Kent, CT17 9EN, England
-5V
5
8
-15V
7
E
A
0
B G _ Vdd
C 7
0
1
2
OUT
3
IC34
4
5 4051
6
Vss
7
Vee
Vss
Vee
TP38
IC15-4
4053
INH
TP1
R2
4
IC15-2
4053
Vdd
R64
300.00R
1
0.063
TP134
9
SW
3
0V(A)
16
C13
100.00n
25.00
DIFF_SELECT[1..3]
+5V
C82
1.00u
40.00
B
R48
100.00K
1
0.063
C2
47.00n
50.00
TP36
IC32-3
SELECT LOOP SOURCE
0V(A)
1
Vloop AC
6
11
10
9
13
14
15
12
1
5
2
4
TP282
13
IC11-3
4053
B
DIFF_SELECT1
DIFF_SELECT2
DIFF_SELECT3
5
4
DIFF_SELECT3
0V(D)
6
-5V
14
TP259
TP131
TP30
12
SW
0V(A)
V+
TP266
SELECT INPUT
FOR LOOP
CCT.
TP281
0V(A)
IC11-1
4053
R46
1.00M
1
0.063
0V(A)
x1 or x10 Gain
TP289
2
SW
D61
LL4148
30.00K
1
0.063
R330
30.00K
1.00
0.06
TP24
1
IC32-1
R329
D
1.00K
1
0.063
4
DIFF GAIN
R44
1.00M
1
0.063
TP27
+
TP280
TP132
R224
+
7
IC53-2
6 TLE2022CD
TLE2022CD
V-
C6
100.00n
25
D15
LL4148
062
5
-5V
15
C
8
V+
0V(D)
10
TP278
TP133
13
74AHCT1G86GW
ZERO CROSS SELECT
6
GND
74HC74
7
TP287
S
12
5
B
VCC
A
GND
Y
VCC
IC10-3
TP264
IC51
ZERO CROSS
TP286
10
4
DIFF OUT
14
1
ZERO
0V(D)
Q
Vss
TP155
74AHCT1G86GW
74HC74
R
16
C
Vee
UNLOADED
C110
5
6
8
3
S
D IC10-1 Q
7
2
+5V
2
Instrument: CM450UK
Drawn By:
KF/OG/RH
Date:
Monday, October 20, 2003
© MEGGER LIMITED
Issue
4
Size A3
1
Date
11-06-04
Sheet
2
CN No.
22036
of
10
5
4
3
2
1
+5V
R279
10.00K
1
0.063
D
R280
10.00K
1
0.063
R281
10.00K
1
0.063
+5V
R282
10.00K
1
0.063
R283
10.00K
1
0.063
TP161
TP162
TP163
R284
10.00K
1
0.063
R285
10.00K
1
0.063
TP164
R286
10.00K
1
0.063
R287
10.00K
1
0.063
TP165
TP166
R288
10.00K
1
0.063
R289
10.00K
1
0.063
R290
10.00K
1
0.063
TP167
TP172
TP168
R292
10.00K
1
0.063
TP169
R293
10.00K
1
0.063
R294
10.00K
1
0.063
D
TP171
TP173
TP174
TP175
LK1
SWK1
1
R291
10.00K
1
0.063
2
SWK2
1
LK2
2
LK3
SWK3
1
2
C
C
LK4
SWK4
1
2
+5V
KEYS LDKEYS CLK-
SWK5
1
2
TP178
SWK6
1
2
1
2
3
4
5
6
7
8
IC22
SH/LD VCC
CLKCLK INH
E
D
F
C
G
B
H
A
QH
SER
GND
QH
TP176
16
15
14
13
12
11
10
9
KEYS DATA
LK5
KEYS LDKEYS CLK-
LK6
TP179
TP177
1
2
3
4
5
6
7
8
+5V
IC23
SH/LD VCC
CLKCLK INH
E
D
F
C
G
B
H
A
QH
SER
GND
QH
16
15
14
13
12
11
10
9
+5V
74HC165
74HC165
TP180
B
1
2
TP292
0V(D)
0V(D)
LK8
SWK8
1
CONFIG DATA
+5V
TEST_KEY_POWER_ON
2
TP181
C83
100.00n
25
+5V
BATTERY +VE
0V(D)
D62
LL4148
SW16
TP135
R226
R227
1.00K
1
0.063
B
R318
10.00K
1
0.063
LK7
SWK7
TP293
C84
100.00n
25
0V(D)
0V(D)
<Core Design>
A
TEST / POWER ON
1.00K
1
0.063
TEST KEY-
MEGGER LIMITED
R81
10.00K
1
0.063
Keys & Config
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Chris Wedge
© MEGGER LIMITED
4
A
6270-290
Title
0V(D)
5
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
3
2
Issue
4
3
Size A4
1
Date
11-06-04
05-05-04
Sheet 3
CN No.
22036
22007
of 10
5
4
3
LINE NEUTRAL ON
LED INDICATOR
2
NEUTRAL_EARTH ON
LED INDICATOR
LINE EARTH ON
LED INDICATOR
+5V
+5V
1
D
D
+5V
D68
D69
D70
R82
1.00K
1
0.063
R83
1.00K
1
0.063
R84
1.00K
1
0.063
TP294
TP41
TP295
TP43
TP42
TP296
TP39
R85
TP40
TP44
R86
R87
TR11
BCW32
TR12
BCW32
TR13
BCW32
C111
100.00n 4.70K
1
25.00
0.063
4.70K
1
0.063
4.70K
1
0.063
0V(D)
0V(D)
0V(D)
0V(D)
C
C
R327
10.00K
1
0.063
C112
100.00n
25.00
R326
10.00K
1
0.063
0V(D)
TP48
TP267
TP268
R328
10.00K
1
0.063
C113
100.00n
25.00
DIFF_SELECT[1..3]
TP45
0V(D)
+5V
TP47
TP269
R88
10.00K
1
0.063
IC37
LED DATA
TP49
DIFF_SELECT[1..3]
1
2
SHIFT0
3
SHIFT1
4
SHIFT2
5
ZC SELECT2 6
7
TP50
DS1
DS2
Q0
Q1
Q2
Q3
GND
Vcc
Q7
Q6
Q5
Q4
MR
CP
14
13
12
11
10
9
8
DIFF_SELECT1
DIFF_SELECT2
DIFF_SELECT3
ZC SELECT1
TP182
C18
100.00n
25
74HC164
TP51
LED CLK
C19
100.00n
25
B
B
0V(D)
ZC SELECT[1..2]
ZC SELECT[1..2]
A
A
<Core Design>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
6270-290
Title
LEDs and Shift Register
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Chris Wedge
Issue
4
3
Size A3
© MEGGER LIMITED
5
4
3
2
1
Date
11-06-04
05-05-04
Sheet 4
CN No.
22036
22007
of 10
5
4
3
2
1
FILTERED 5V
FILTERED 5V
R89
10.00K
1
0.063
R90
10.00K
1
0.063
D
R91
R92
IC17-1
3 +
LMV324
2 _
Volts L-N
10.00K
1
0.063
IC17-4
12 +
LMV324
13 _
Volts N-E
1
Volts L-N Shifted
10.00K
1
0.063
TP184
D
14
Volts N-E Shifted
TP183
TP185
TP186
C
C
FILTERED 5V
R93
10.00K
1
0.063
R94
IC17-2
5 +
LMV324
6 _
Volts L-E
10.00K
1
0.063
+5V
7
4
Volts L-E Shifted
C85
100.00n
25
TP187
IC17-5
TP297
V+
FILTERED 5V
LMV324
V-
C20
100.00n
25
11
B
R95
10.00R
1
0.063
B
TP188
0V(A)
A
A
<Core Design>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
6270-290
Title
Level Shift
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Chris Wedge
Issue
4
3
Size A3
© MEGGER LIMITED
5
4
3
2
1
Date
11-06-04
05-05-04
Sheet 5
CN No.
22036
22007
of 10
5
4
3
2
1
+5V
+5V
TP270
RXD1
TP271
TXD1
TP52
TP272
RXD0
1
4
TP273
TXD0
LC1
1
2
0V(D)
R116
10.00R
1 0.063
Buzzer
0V(S)
TP53
TP58
2
3
R122
1.00M
1
0.063
R123
33.00R
1
0.063
R124
33.00R
1
0.063
R331
TR35
BC807-25
R125
1.00M
1
0.063
10.00K
0.063
C31
2.20uF
TP300
16
R127
10.00R
1
0.063
TP301
C34
10.00uF+
16
10.00K
1
0.063
BACKLIGHT
100.00K
1
0.063
TP62
C
8
Vcc
IC39
24C64
R130
10.00K
1
0.063
TP64
A0
A1
A2
WP
SDA
5
SCL
6
+5V
4
3
2 RXD0
1 TXD0
R132
10.00K
1
0.063
R131
10.00K
1
0.063
0V(D)
N-E FIT
L-N FIT
PROG
+5V
0V(D)
LOADED
UNLOADED
ZERO
0V(D)
POWER OFF
ZERO CROSS 50%
I x10
+5V
4
TP65
ZERO CROSS
TEST KEY-
8
Vcc
A0
A1
A2
WP
XOR
SDA
SCL
5
IC52
Patch EEPROM
Not Normally
fitted
4
NMIC36
1
2
3
6
Vss
1
2
3
7
SW_5VZERO CROSS SELECT
TP274
0V(D)
5
B
VCC
A
GND
Y
4
74AHCT1G86GW
IC40
24C64
+5V
B
TP275
R138
10.00K
1
0.063
TP303
100.00n
25
0V(D)
0V(D)
TP67
XL1
C37
TP68
DAC x2
I ENABLELOOP TEST
DAC I
LED DATA
LED CLK
Volts L-N Shifted
Volts L-E Shifted
Volts N-E Shifted
DIFF OUT
TEMP TR
TEMP R
I Sense
MHz 6
NMI-
C38
33.00p
50
33.00p
50
38
37
36
35
DIFF GAIN
P64
34
FLASH - CLK1
33
RXD1
32
TXD1
31
BACKLIGHT30
SPARE1
29
BUZZ
28
27
26
25
SDA 24
23
22
21
20
19
18
NMI- 17
11
10
7
6
5
4
3
2
1
100
97
95
94
93
92
91
90
BATTERY V 89
15
13
RES
12
BYTE
8
9
+5V
R322
10.00K
1
0.063
TP56
TP314
R126
30.00K
1
0.063
P60/CTS0/RTS0
P61/CLK0
P62/RxD0
P63/TxD0
P64/CTS1/RTS1/CTS0/CLKS1
P65/CLK1
P66/RxD1
P67/TxD1
P70/TxD2/SDA/TA0out
P71/RxD2/SCL/TA0in/TB5in
P72/CLK2/TA1out/V
P73/CTS2/RTS2/TA1in/V
P74/TA2out/W
P75/TA2in/W
P76/TA3out
P77/TA3in
P80/TA4out/U
P81/TA4in/U
P82/INT0
P83/INT1
P84/INT2
P85/NMI
P86/Xcout
P87/Xcin
P90/TB0in/CLK3
P91/TB1in/Sin3
P92/TB2in/Sout3
P93/DA0/TB3in
P94/DA1/TB4in
P95/ANEX0/CLK4
P96/ANEX1/Sout4
P97/ADtrg/Sin4
P100/AN0
P101/AN1
P102/AN2
P103/AN3
P104/AN4/KI0
P105/AN5/KI1
P106/AN6/KI2
P107/AN7/KI3
Xin
Xout
RESET
BYTE
CNVss
SEG27
SEG28
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
BP 1
BP 2
BP 3
BP 4
RANGE A
RANGE B
2nd SW A
2nd SW B
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG32
SEG31
SEG30
SEG29
FLASH - CE
P51
P52
P53
P57
P56
P54
P55
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
BP 1
BP 2
BP 3
BP 4
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
D
6280-350
TP59
R129
10.00K
1
0.063
TP60
72
71
70
69
68
67
66
65
63
61
60
59
58
57
56
55
54
53
52
51
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
50
49
48
47
46
45
44
43
39
40
42
41
C1
C2
C3
C4
S32
S31
S30
S29
S28
S27
S26
S25
S24
S23
S22
S21
S20
S19
BATTERY V
TR16
BCW32
P20/A0(/D0/-)
P21/A1(/D1/D0)
P22/A2(/D2/D1)
P23/A3(/D3/D2)
P24/A4(/D4/D3)
P25/A5(/D5/D4)
P26/A6(/D6/D5)
P27/A7(/D7/D6)
P30/A8(/-/D7)
P31/A9
P32/A10
P33/A11
P34/A12
P35/A13
P36/A14
P37/A15
P40/A16
P41/A17
P42/A18
P43/A19
P00/D0
P01/D1
P02/D2
P03/D3
P04/D4
P05/D5
P06/D6
P07/D7
P10/D8
P11/D9
P12/D10
P13/D11
P14/D12
P15/D13/INT3
P16/D14/INT4
P17/D15/INT5
P44/CS0
P45/CS1
P46/CS2
P47/CS3
P50/WRL/WR
P51/WRH/BHE
P52/RD
P53/BCLK
P57/RDY/CLKout
P56/ALE
P54/HLDA
P55/HOLD
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
C33
10.00nF
50
0V(A)
0V(A)
+5V
R164
30.00K
1
0.063
2.5V REFERENCE
IC17-3
10 +
LMV324
9 _
TP104
R133
10.00K
1
0.063
R134
10.00K
1
0.063
R135
10.00K
1
0.063
R136
10.00K
1
0.063
C63
100.00n
25
C
8
R169
30.00K
1
0.063
TP107
0V(A)
RANGE A
RANGE B
2nd F A
2nd F B
+5V
R137
10.00K
1
0.063 TP66
B
CONF DATA
KEYS DATA
KEYS LDKEYS CLK
RELAY L-N
RELAY N-E
TP74
+5V
PROG
C39
100.00n
25.00
R140
10.00K
1
0.063
SW18
R142
100.00K
1
0.063
0V(D)
R143
10.00K
1
0.063
SW19
TXD1
R321
10.00K
1
0.063
RXD1
R320
10.00K
1
0.063
TXD0
R319
10.00K
1
0.063
RXD0
A
BUSY P64
RXD1
EPM P55
RES
TXD1
Vcc
Vcc
AVcc
Vref
AVss
Vss
Vss
R141
100.00K
1
0.063
TP81
PL21
R121
100.00K
1
0.063
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
M30620F CPFP
D21
LL4148
+5V
2
4
6
8
10
0V(D)
TP73
0V(D)
1
FLASH - CLK1 3
FLASH - CE
5
7
PROG
9
TP57
0V(D)
SPARE1
+5V
16
62
99
98
96
14
64
0V(S)
DIFF GAIN
6
5
4
3
2
1
Cal Plug
Vss
1
2
3
7
0V(D)
PP1
EEPROM (8k x 8)
R120
30.00K
1
0.063
C32
100.00n
25
AVSS
0V(S)
+5V
TR15
IC38
Vref
C35
100.00n
25
PL26
BCF29
TR14
BCW32
TP302
A-VCC
MMBF0201NLT1
0V(D)
TP299 BUZZ
1.00K
1
0.063
+
TP54
R119
+5V
R128
R333
R118
10.00R
1
0.063
BACKLIGHT1
TP61
TR33
R332
R117
30.00K
1
0.063
+5V
TP298
D
TP55
LL4148
D20
+5V
0.063
2.20K
+
+5V
1
BATTERY +VE
WD1
BL1
LCD BACKLIGHT
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
LKD3
BACKLIGHT DRIVER
0V(D)
0V(D)
A
RESET
0V(D)
<Core Design>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
PROG
6270-290
Title
Microprocessor Circuits
Instrument: Loop Tester
Drawn By:
Rongkai Xu
Date:
Tuesday, November 04, 2003
© MEGGER LIMITED
5
4
3
2
Issue
4
3
Size A3
1
Date
11-06-04
05-05-04
Sheet 6
CN No.
22036
22007
of 10
5
4
TP276
3
2
1
TP83
BATTERY +VE
FS1
PL22
3
2
1
TP84
3.00 A
C41
10.00uF
16.00
TP277
12V in - 8 AA Cells
+
R147
100.00K
1
0.063
D22
MBRS130LT3
R144
1.00K
1
0.063
C51
10.00nF
50.00
TP304
NDS352AP
D
BATTERY +VE
HI = OFF, LO = ON
R335
TR30
BCW32
1.00M 1
0.063
R228
1.00M
1
0.063
D63
HI = ON
R230
3.00K
1
0.063
TR22
TP94
R303
TP146
300.00R
1
0.063 TR31
C
TR21
D24
PULSE HI TO
TURN ON
TP149
LL4148
POWER_OFF
R231
10.00K
1
0.063
HI = OFF
C92
100.00n
25
MMBF0201NLT1
TEST_KEY_POWER_ON
MMBF0201NLT1
TP189
0V(P)
IC41
GND
OUT
RT
Vcc
DTC
COMP
SCP
FB
TL5001ACD
8
7
6
5
TP140
TP87
MMBF0201NLT1
TP141
D64
LL4148
TP142
220uH
D73
BZX84C5V6
C118
R151
100.00K
1
0.063
+ 100.00uF
16.00
16.00
TP88
1
2
3
4
R149
10.00K
1
0.063
TP91
50
1.00n
TP143
TP148
R334
0R
1.00
0.00
TP93
R154
3.00K
1
0.063
C49
TP306
+ 10.00uF
R158
2
IC25-1
YLM339
+
C
5
C52
10.00nF
50.00
LL4148
D26
+
D27
TP308
16
4
0V(P)
+5V
C104
+ 10.00uF
C76
100.00n
25
TP95
TP307
30.00K
1
0.063
R159
10.00K
1
0.063
0V(D)
R155
300.00R
1
0.063
16
R156
3.00K
1
0.063
C103
10.00nF
50.00
R150
30.00K
1
0.063
TP90
BCF29
TR20
TP313
C46
TP145
R157
100.00K
1
0.063
TP89
D25
LL4148
C45
10.00nF
50.00
TP144
C119
+ 100.00uF
0V(P)
TP305
100.00n
25.00
D
+5V
TP86
MBRS130LT3
TP139
HI = ON, LO = OFF
LL4148
10.00nF
50.00
1.00
TR19
D23
C44
220.00n
25.00
TP138
C120
LO = OFF
C40
L3
R229
1.00M
1
0.063
SW_OFF
10.00M
NDS352AP
TP85
TR18
0V(P)
R145
0V(P)
R160
30.00K
1
0.063
C105
10.00uF
16
LM339
10
-
11
Y
+IC25-4
NMI CIRCUIT
+5V
R232
30.00K
1
0.063
C93
100.00n
25
R233
1.00M
1
0.063
TWEAK
R234
68.00K
1
0.063
8
TP151
9
C42
+ 10.00uF
D65
LL4148
Y
16
TP190
14
+15V
R161
D66
100.00K
1
0.063
NMI-
+IC25-3
R236
10.00K
1
0.063
-5V
R235
10.00K
1
0.063
LM339
TP150
B
LL4148
13
TP99
0V(P)
B
BAV99
L2
TP309
+5V_SWITCHED
TP152
TP310
LM339
6
-
7
Y
+IC25-2
C54
22.00pF
50.00
1
R165
100.00K
1
0.063
0V(P)
R166
7.50K
2
0.125
C59
470.00p
50.00
TP102
C60
330.00pF
50.00
220uH
TP101
IC42
1
2
3
4
-IN
Vin
+INCUR LIM
OSC COL
GND EMIT
LM3578AM
8
7
6
5
TP103 TP311
C58
100.00n
25.00
C107
+ 10.00uF
+
50
R167
1.00R
1
0.063
C106
+ 10.00uF
C108
10.00uF
50
C77
100.00n
25
50
LL4148
D30
LKD1
0V(P)
5V SWITCH
+5V
TR25
+5V_SWITCHED
NDS352AP
FOR 15V
SUPPLIES
+5V
1
0V(A)
2
LKD2
1
2
3
V+
R237
30.00K
1
0.063
A
C109
+ 10.00uF
0V(P)
50
D31
0V(D)
IC25-5
LM339
V-
C62
10.00nF
50
C78
100.00n
25
A
LL4148
-15V
<Core Design>
12
0V(P)
SW_5V-
R170
100.00K
1
0.063
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
TP105
POWER SUPPLIES
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Rongkai Xu
Issue
4
3
Size A3
© MEGGER LIMITED
5
6270-290
Title
0V(P)
4
3
2
1
Date
11-06-04
05-05-04
Sheet 7
CN No.
22036
22007
of 10
5
4
3
SW_OFF
2
These LEDs are for debug only
and are not intended to be
fitted on production
instruments
+5V
+5V
D32
D33
D34
D36
D
R173
1.00K
1
0.063
TP194
R172
220.00R
1
0.125
D35
D37
D71
1
RANGE_LEDS
D41
TP195
TP5
0V(D)
D43
R175
1.00K
1
0.063
R176
1.00K
1
0.063
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
TC17
TC18
TC19
TC20
TC21
TC22
TC23
TC24
TC01
TC02
TC03
TC04
TC05
TC06
TC07
TC08
TC09
TC10
TC11
TC12
TC13
TC14
TC15
TC16
C
Top switch
Bottom switch
Ring Alignment
Ring Alignment
SW12
TP2
RANGE POSITION OUTER
TO01
|
TM09
|
TC17
BO01
|
BM17
|
RANGE
BC09
RANGE POSITION SWITCH MIDDLE
CENTER
145
POSITION SWITCH INNER
TP1
BC09
BC10
BC11
BC12
BC13
BC14
BC15
BC16
BC17
BC18
BC19
BC20
BC21
BC22
BC23
BC24
BC01
BC02
BC03
BC04
BC05
BC06
BC07
BC08
TP1
TP5
TP4
+5V
TP3
Range Switch
B
137
138
139
140
141
142
143
144
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
BO01
BO02
BO03
BO04
BO05
BO06
BO07
BO08
BO09
BO10
BO11
BO12
BO13
BO14
BO15
BO16
BO17
BO18
BO19
BO20
BO21
BO22
BO23
BO24
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
0V(A)
TP197
01
R179
1.00K
1
0.063
B
POWER SWITCH MIDDLE
TP3
R178
1.00K
1
0.063
TP200
TR26
BCW32
0V(D)
R177
1.00K
1
0.063
TP199
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
POWER SWITCH OUTER
BM17
BM18
BM19
BM20
BM21
BM22
BM23
BM24
BM01
BM02
BM03
BM04
BM05
BM06
BM07
BM08
BM09
BM10
BM11
BM12
BM13
BM14
BM15
BM16
TP198
TM09
TM10
TM11
TM12
TM13
TM14
TM15
TM16
TM17
TM18
TM19
TM20
TM21
TM22
TM23
TM24
TM01
TM02
TM03
TM04
TM05
TM06
TM07
TM08
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
TP4
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
97
98
99
100
101
102
103
104
C
R174
22.00K
1
0.063
0V(D)
TO01
TO02
TO03
TO04
TO05
TO06
TO07
TO08
TO09
TO10
TO11
TO12
TO13
TO14
TO15
TO16
TO17
TO18
TO19
TO20
TO21
TO22
TO23
TO24
TP196
D
RANGE LEDS
D39
RANGE B
R180
100.00K
1
0.063
RANGE A
TP201
C115
1.00n
50.00
R181
100.00K
1
0.063
TP202
C114
1.00n
50.00
0V(A)
<Core Design>
MEGGER LIMITED
A
0V(A)
A
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
6270-290
Title
Range Switch
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Chris Wedge
© MEGGER LIMITED
5
4
3
2
Issue
4
3
Size A4
1
Date
11-06-04
05-05-04
Sheet 8
CN No.
22036
22007
of 10
R316
1.00K
1
0.063
TP209
TAP1
R317
1.00K
1
0.063
5
SW13
RANGE POSITION OUTER
+5V
4
D48
D72
D50
POWER SWITCH OUTER
TO01
|
TM09
|
TC17
0V(A)
R185
100.00K
1
0.063
3
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
D46
TC17
TC18
TC19
TC20
TC21
TC22
TC23
TC24
TC01
TC02
TC03
TC04
TC05
TC06
TC07
TC08
TC09
TC10
TC11
TC12
TC13
TC14
TC15
TC16
TM09
TM10
TM11
TM12
TM13
TM14
TM15
TM16
TM17
TM18
TM19
TM20
TM21
TM22
TM23
TM24
TM01
TM02
TM03
TM04
TM05
TM06
TM07
TM08
D47
BC09
BC10
BC11
BC12
BC13
BC14
BC15
BC16
BC17
BC18
BC19
BC20
BC21
BC22
BC23
BC24
BC01
BC02
BC03
BC04
BC05
BC06
BC07
BC08
R314
1.00K
1
0.063
BM17
BM18
BM19
BM20
BM21
BM22
BM23
BM24
BM01
BM02
BM03
BM04
BM05
BM06
BM07
BM08
BM09
BM10
BM11
BM12
BM13
BM14
BM15
BM16
4
137
138
139
140
141
142
143
144
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
B
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
D45
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
97
98
99
100
101
102
103
104
R315
1.00K
1
0.063
TAP1
TP208
TAP3
TAP5
TP207
TAP5
TAP4
R313
1.00K
1
0.063
TO01
TO02
TO03
TO04
TO05
TO06
TO07
TO08
TO09
TO10
TO11
TO12
TO13
TO14
TO15
TO16
TO17
TO18
TO19
TO20
TO21
TO22
TO23
TO24
D
TAP3
TP206
BO01
BO02
BO03
BO04
BO05
BO06
BO07
BO08
BO09
BO10
BO11
BO12
BO13
BO14
BO15
BO16
BO17
BO18
BO19
BO20
BO21
BO22
BO23
BO24
TP205
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
5
3
2
+5V
R182
220.00R
1
0.125
Top switch
Bottom switch
Ring Alignment
Ring Alignment
RANGE POSITION SWITCH MIDDLE
BO01
|
BM17
|
RANGE
BC09
TP211
2nd F A
C117
1.00n
50.00
2
1
2nd Function Switch
These LEDs are for debug only
and are not intended to be
fitted on production
instruments
D52
D
+5V
RANGE_LEDS
TP203
R312
1.00K
1
0.063
R183
22.00K
1
0.063TP204
CENTER
TP210
R184
100.00K
1
0.063
A
0V(A)
Instrument:
Drawn By:
Date:
LT/RCDT3xx
Chris Wedge
© MEGGER LIMITED
TR27
BCW32
POWER SWITCH MIDDLE
TAP4
0V(D)
C
01
C
145
POSITION SWITCH INNER
TAP2
B
2nd F B
C116
1.00n
50.00
0V(A)
<Core Design>
MEGGER LIMITED
Archcliffe Road, Dover,
Kent, CT17 9EN, England
Document Number
Issue
4
3
Size A4
1
Date
11-06-04
05-05-04
Sheet 9
A
Title
6270-290
2nd Function Switch
CN No.
22036
22007
of 10
5
4
3
2
1
ZERO-CROSSING DETECTOR
+5V
SELECT ZERO CROSS
SOURCE
ZC SELECT[1..2]
D
D
+5V
0V(A)
ZC SELECT1
ZC SELECT2
6
11
10
9
13
14
15
12
1
5
2
4
Volts L-N
Volts L-E
Volts N-E
TP216
TP217
TP218
E
A
0
B G _ Vdd
C 7
0
1
2
OUT
3
IC45
4
5 4051
6
Vss
7
Vee
16
R206
C94 TP214
100.00n
25
R207
47.00K
1
0.063
R210
10.00M
1
0.063
TP123
3
LM339
+
Y
- IC49-1
5
8
7
0V(D)
4
10.00K
1
0.063
R323
10.00K
1
-5V
R213
1.00K
1
0.063
TR32
ZERO-CROSSING
CLAMPER
R211
TP124
2
ZERO CROSS 2
TP215
TP230
C95
100.00n
25
0V(A)
R208
1.00K
1
0.063
TP125
ZERO-CROSSING
1.00K
1
0.063
D67
LL4148
0V(A)
MMBF0201NLT1
TP231
0V(A)
ZERO CROSS 50%
C
C
+5V
4
TP127
+5V
+5V
3
TP219
V+
1
12
3
4
6
7
5
15
-5V
TP222
C67
22.00nF
50.00
0V(A)
16
C/IN
P1/OUT
VCOUT P2/OUT
C1(1)
PULSE
C1(2)
Vco IN
INH
DEMOD
ZEN
IC43
LM339
+
Y
- IC49-4
11
10
2
13
1
9
10
5
Q
6
IC1-1
74HC74
R
1
ZERO CROSS 1
TP221
SK22
PLL LOCKED
+5V
TP223
R2
Vss
R215
10.00K
1
0.063
13
R216
100.00K
1
0.063
C
Q
R214
10.00K
1
0.063
14
10
8
R1
TP226
12
TP225
11
C96
TP224
100.00n
25
3
TP129
TP130
4046
B
TP220
D
Vdd
+5V
SIG
6
14
LM339
+
Y
- IC49-2
7
LM339
IC49-5
V-
TP261
S
2
TP227
12
C68
10.00nF
50
11
C97
100.00n
25
B
D
Q
9
Q
8
IC1-2
C
VCC
TP262
S
74HC74
R
IC1-3
GND
74HC74
7
TP263
13
0V(A)
0V(D)
0V(A)
TP312
9
8
LM339
+
Y
- IC49-3
14
Not Fitted list
Surface Mount D63
IC40
R1 & R2
SW18 & SW19
A
0V(A)
Conventional
LK1, LK2, LK3, LK4, LK5, LK6, LK7, LK8
D32, D33, D34, D35, D36, D37, D38, D39, D40, D41
D43, D45, D46, D47, D48, D50, D52, D71, D72
PL24, PL25
A
<Core Design>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
6270-290
Title
ZERO CROSSING Circuit
Instrument: Loop Tester
Drawn By:
Rongkai Xu
Date:
Tuesday, October 21, 2003
© MEGGER LIMITED
5
4
3
2
Issue
4
3
Size A3
1
Date
11-06-04
05-05-04
Sheet 10
CN No.
22036
22007
of 10
5
4
3
2
1
SK1
D
+5V
0V(A)
0V(D)
-5V
+15V
-15V
+5V_SWITCHED
RLN fitted
+5V
0V(A)
0V(D)
-5V
+15V
-15V
+5V_SWITCHED
Neutral
L-N
L-N
Loop
DAC x2
I EnableI x10
DAC I
L-N
Temp Measure
TEMP TR (D)
TEMP R (D)
Neutral
TEMP TR (D)
TEMP R (D)
Earth
I Sense
N or E
TEMP TR (D)
TEMP R (D)
Temp TR
Temp R
C
Temp TR
Temp R
Temp Measure
Earth
L or N
Volts L-N
Volts L-E
Volts N-E
Volts L-E (High Gain)
Volts N-E (High Gain)
TEMP TR
TEMP R
I Sense
SPARE
DAC x2
I EnableLoop
DAC I
I x10
RLN fitted
RNE fitted
N or E
L or N
Line
RNE fitted
Current Source
I Sense
Current Source
PL3
Relays
L or N
TP175
TP176
TP177
TP178
TP179
TP180
TP181
TP182
TP183
TP184
TP185
TP186
TP187
TP188
TP189
TP190
TP191
TP192
TP193
TP194
TP195
TP196
TP197
TP198
TP199
Loop
Relays
0V(S)
Line
C
DAC I
DAC x2
I EnableI x10
RNE fitted
PL4
N or E
D
Volts L-N
Volts L-E
Volts N-E
Volts L-E (High Gain)
Volts N-E (High Gain)
TEMP TR
TEMP R
I Sense
SPARE
DAC x2
I EnableLoop
DAC I
I x10
RLN fitted
RNE fitted
N or E
L or N
RLN fitted
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
PL5
Measurement
B
B
Volts L-N
Line
Volts L-E
Volts N-E
Volts L-N
Volts L-E
Volts N-E
Neutral
Volts L-E (High Gain)
Earth
Volts N-E (High Gain)
Volts L-E (High Gain)
Volts N-E (High Gain)
Measurement
A
A
<Variant Name>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
Title
6270-289
LT/RCDT300 series Power PCB
Instrument: LT3xx/RCDT3xx
Drawn By:
Rongkai Xu/Chris Wedge
Date:
Monday, October 20, 2003
© MEGGER LIMITED
5
4
3
2
Issue
2
3
Size A3
1
Date
26/4/04
11-06-04
Sheet 1
CN No.
21993
22036
of 6
5
4
3
2
1
+5V
D58
D
RL1
3
+
SK10
LL4148
-
SK9
D
4
FS2
2
Line
5
A
L-N
1
2A 32mm FUSE
R186
RLN fitted
TR28
BCW32
L or N
3.00K
1
0.063
TP108
R187
1.00M
1
0.063
C
SK12
C
0V(D)
SK11
+5V
FS3
Neutral
D59
2A 32mm FUSE
RL2
B
-
3
LL4148
+
A
4
B
2
Earth
5
1
0V(A)
RNE fitted
R188
TR29
BCW32
N or E
3.00K
1
0.063
R189
1.00M
1
0.063
TP109
<Variant Name>
A
MEGGER LIMITED
0V SUPPLY FOR
RELAY COILS
0V(D)
Title
4
3
2
6270-289
LT/RCDT300 series Power PCB
Instrument: LT3xx/RCDT3xx
Drawn By:
Rongkai Xu/Chris Wedge
Date:
Monday, October 20, 2003
© MEGGER LIMITED
5
A
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
Issue
2
3
Size A4
1
Date
26/4/04
11-06-04
Sheet 2
CN No.
21993
22036
of 6
5
4
3
2
1
C21
C22
C23
100.00pF
50
R96
100.00pF
50
R97
100.00pF
50
R98
D
0V(S)
470.00K
0V(S) 1
0.063
0V(S)
47.00K
1
0.063
47.00K
1
0.063
D
R99
Line
R100
R101
Neutral
10.00M
1
0.5
Line
10.00M
1
0.5
3
+
IC20-1
2 062
1
10.00M
1
0.5
Volts L-N
3
+
IC19-1
2 062
1
+
IC18-1
2 062
R104
Neutral
10.00M
1
0.5
R106
R107
Volts L-E (High Gain)
Earth
Earth
10.00M
1
0.5
10.00M
1
0.5
1
R102
Volts N-E
R103
R105
470.00K
1
0.063
C24
47.00K
1
0.063
C25
47.00K
1
0.063
C26
C
3
100.00pF
50
C
100.00pF
50
100.00pF
50
C27
C28
100.00pF
50
R108
100.00pF
50
R109
+5V
0V(S)
47.00K
1
0.063
0V(S)
R110
TP241
Line
TP243
470.00K
1
0.063
R111
10.00M
1
0.5
B
5
+
IC20-2
6 062
7
Volts L-E
R112
Earth
R113
10.00M
1
0.5
8
8
8
V+
V+
V+
IC20-3
IC19-3
IC18-3
Neutral
5
062
V-
062
V-
062
V-
4
4
4
TP242
R218
10.00K
1
0.063
47.00K
1
0.063
C29
+
IC19-2
6 062
R219
10.00K
1
0.063
B
7
10.00M
1
0.5
5
+
IC18-2
6 062
7
Volts N-E (High Gain)
R114
R217
10.00K
1
0.063
Earth
R115
10.00M
1
0.5
470.00K
1
0.063
C30
100.00pF
50
0V(S)
-5V
+5V
C86
100.00n
25
A
100.00pF
50
C87
100.00n
25
C88
100.00n
25
A
<Variant Name>
MEGGER LIMITED
C89
100.00n
25
C90
100.00n
25
Title
4
6270-289
LT/RCDT300 series Power PCB
Instrument: LT3xx/RCDT3xx
Drawn By:
Rongkai Xu/Chris Wedge
Date:
Monday, October 20, 2003
© MEGGER LIMITED
-5V
5
3
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
0V(S)
C91
100.00n
25
2
Issue
2
3
Size A3
1
Date
26/4/04
11-06-04
Sheet 3
CN No.
21993
22036
of 6
5
4
3
2
1
+5V
D
R192
R195
15.00K
1
0.063
+5V
Temp R is two diode junctions attached to the power resistors. Would
expect a voltage about 1.2V, changing by -4mV/C. We could expect
tempertures in the range -10C (cold, no test) to about 100C .. a range
of about 1.1V - 1.5V.
R196
1.00M
1
0.063
10.00K
1
0.063
TP111
IC21-2
5 +
LM324
6 _
0V(S)
1
R191
10.00K
1
0.063
R194
10.00K
1
0.063
TP115
4
IC21-1
3 +
LM324
2 _
0.31V
TEMP R (D)
+5V
TP153
x4.7
R190
3.00K
1
0.063
TP110
R238
R239
1.00K
1
0.063
1.00K
1
0.063
7
R193
D66
LL4148
47.00K
1
0.063
TP112
D
Temp R
TP113
0V(A)
TP114
0.31V
V+
IC21-5
LM324
C65
10.00nF
50
V11
R197
1.00K
1
0.063
R198
1.00M
1
0.063
TP257
+5V
R337
10.00R
1
0.063
-5V
TP117
C
IC21-3
10 +
LM324
9 _
0V(S)
TEMP TR (D)
Temp TR is one diode junctionsattached to the power transistors.
Would expect a voltage about 0.6V, changing by -2mV/C. We could
expect tempertures in the range -10C (cold, no test) to about 100C ..
a range of about 0.55V - 0.75V.
R203
10.00K
1
0.063
+5V
C120
100.00n
25
+5V
C121
C117
100.00n
25
0V(S)
8
10.00K
1
0.063
IC21-4
12 +
LM324
13 _
R202
10.00K
1
0.063
R205
TP120
B
TP155
x4.7
R201
3.00K
1
0.063
R240
Temp TR
1.00K
1
0.063
R204
TP118
C
R241
14
1.00K
1
0.063
D67
LL4148
47.00K
1
0.063
TP121
TP156
TP119
0V(A)
B
+15V
C116
+ 10.00uF
16
C118
+ 10.00uF
50
+ 10.00uF
C119
100.00n
25
16
C122
C125
100.00n
25
C124
+ 10.00uF
+ 10.00uF
50
0V(A)
C123
100.00n
25
16
0V(D)
-5V
-15V
A
A
<Variant Name>
MEGGER LIMITED
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
Title
6270-289
LT/RCDT300 series Power PCB
Instrument: LT3xx/RCDT3xx
Drawn By:
Rongkai Xu/Chris Wedge
Wednesday, October 29, 2003
Date:
© MEGGER LIMITED
5
4
3
2
Issue
2
1
Size A3
1
Date
26/4/04
11-06-04
Sheet 4
CN No.
21993
22036
of 6
5
4
3
2 SK15
SK13
SK14
1
Wire
Link
R243
Current Source +VE
390.00K
5
0.5
R247
100.00R
5
7
D
D
By Power Resistors
TEMP R (D)
2
D87
TP232
R311
1.00K
1
0.063
LL4148
D88
1
TX2
R310
330.00R
1
0.063
R312
1.00M
1
0.063
R308
R251
91R0
5.00
12.00
TP213
LL4148
R314
330.00R
1 0.063
TR33
BCW32
TR34
BCW32
D94
TR41
1.30R
1
0.25
TP228
BC807-25
R319
TP215
BA159
TR37
STP6NK90Z
10.00K
1
0.063
TP221
TEMP TR (D)
TR46
TR43
BCW32
FQA11N90
TP224
TP225
D90
C
C113
100.00nF
BZX79C15
D95
LL4148
C112
100.00nF
C114
10.00nF
50
R321
100.00K
1
0.063
R322
68.00K
1
0.063
TR44
MJF31C
C111
1.00n
50
C127
1.00n
50
C
TR37 for RCD Tester
TR46 for Loop Tester
0V(S)
D79
1N4007
+5V
D80
1N4007
16
C107
100.00nF
50
+5V
VCC
IC52-3
GND
D81
1N4007
74HC123
B
200ns pulses every 8us
0V(D)
R313
+5V
R316
10.00K
1
0.063
TP217
TP218
15
14
1
2
3
C110
1.00n
50
A
RC
C
Q
A
&
B
RES
Q
74HC123
R318
2.20K
1
0.063
C108
100.00nF
50
1
2
R299
33.00R
2
0.75
D83
1N4007
D84
1N4007
TX1
TP214
D85
1N4007
IC52-2
6
7
9
10
11
13
TP222
4
C109
22.00pF
50
TP226
R298
150.00R
1
0.25
TP216
TP219
IC52-1
TP220
Current Source Drive
R317
10.00K
1
0.063
D89
LL4148
D82
1N4007
B
TP212
1.30R
1
0.25
R315
10.00K
1
0.063
R297
150.00R
1
0.25
R309
100.00R
1
0.063
8
LL4148
D93
R320
10.00K
1
0.063
C
RC
Q
A
&
B
RES
Q
74HC123
5
R300
20.00R
1
0.25
TR42
12
MMBF0201NLT1
R301
20.00R
1
0.25
D86
1N4007
SK17
TP254
A
<Variant Name>
Current Source -VE
Document Number
MEGGER LIMITED
0V(D)
Archcliffe Road, Dover,
Kent, CT17 9EN, England
Title
6270-289
LT/RCDT300 series Power PCB
Instrument: LT3xx/RCDT3xx
Drawn By:
Rongkai Xu/Chris Wedge
Date:
Monday, October 20, 2003
© MEGGER LIMITED
5
4
3
2
Issue
2
3
Size A3
1
Date
26/4/04
11-06-04
Sheet 5
CN No.
21993
22036
of 6
5
4
TP248
3
2
1
+15V
TP249
TP200
IC49-1
+
Y
- LM339
5
4
7
2
6
IC49-2
+
Y
LM339
TP201
IC49-4
+
Y
LM339
11
1
10
TP202
V+
IC49-5
LM339
V-
R323
10.00K
1
0.063
R324
10.00K
1
0.063
L-N
3
13
+5V
12
Current Source +VE
I Enable-
D
D
-15V
0V(A)
R340
10.00K
1
0.063
TP240
TP161
TP158
R248
DAC I
10.00K
1
0.063
R325
100.00K
1
0.063
Not Fitted
TP162
IC46-1
3 +
TL064CD 1
2 _
R249
I Enable-
TP203
R242
D68
TR32
BC807-25
10.00K
1
0.063
R250
10.00K
1
0.063
TP204
10.00K
1
0.063
R252
TP159
10.00M
1
0.063
R253
10.00K
1
0.063
TP205
9
8
TR35
MMBF0201NLT1
DAC x2
R254
3.30K
1
0.063
TP163
TP164
IC49-3
+
Y
LM339
1N4007
TP206
R326
14
Current Source Drive
3.30K
1
0.063
C
TP207
R338
100.00K
1
0.063
D91
LL4148
0V(A)
+15V
TP229
4
R257
10.00K
1
0.063
TR45
LOOP
V+
Current Source -VE
MMBF0201NLT1
TP208
TP244
C115
TP245
11
TP168
0V(A)
R261
-15V
10.00K
1
0.063
10.00K
1
0.063
IC46-2
+ 5
TL064CD
7
_ 6
B
IC46-3
+
8 TL064CD
_
TP210
D98
LL4148
TP167
10.00nF
50
10.00K
1
0.063
D97
LL4148
8
TP169
R266
6
10
10.00K
1
0.063
9
D
2
TP209
DG212CJ
TP255
+5V
IC51-2
8
6
IN
D
7
R276
TP239
+15V
S
+5V_SWITCHED
10.00K
DG212CJ
13
C104
100.00n
25
A
V+
VL
11
IN
D
TP247
IC51-5
DG212CJ
IC51-3
9
0.063 1
12
10
GND
C106
100.00n
25
S
5
V-
C105
100.00n
25
TP173
IC46-4
12 +
TL064CD 14
13 _
R277
R278
10.00K
1
0.063
I Sense
16
IN
14
S
D
0V(A)
15
TP230
DG212CJ
D92
LL4148
0V(A)
0V(A)
<Variant Name>
MEGGER LIMITED
TR40
MMBF0201NLT1
6270-289
LT/RCDT300 series Power PCB
Instrument: LT3xx/RCDT3xx
Drawn By:
Rongkai Xu/Chris Wedge
Date:
Monday, October 20, 2003
© MEGGER LIMITED
-15V
0V(A)
0V(A)
3
Document Number
Archcliffe Road, Dover,
Kent, CT17 9EN, England
TP174
4
TP211
R274
1.00K
1
0.063
Title
5
R272
3.30R
1
3
IC51-4
DG212CJ
0V(A)
-15V
B
A
DAC x2
4
R267
3.30R
1
3
TP250
R339
10.00K
1
0.063
D78
LL4148
10.00K
1
0.063
10.00K
1
0.063
2
5 1 4
S
TP172
3
R273
1.00K
1
0.063
0V(A)
0V(A)
R264
TP252 TP253
I x10
10.00K
1
0.063
7
+
IC50
OP07CS
R268
18.00K
1
0.125
R269
IC51-1
Not Fitted
TP251 +15V
R262
R327
IN
C
D75
P6KE440P
0V(A)
IC46-5
TL064CD
V-
3
D70
1N4007
D72
0V(A)
1
D69
1N4007
D71
P6KE440P
2
Issue
2
3
Size A3
1
Date
26/4/04
11-06-04
Sheet 6
CN No.
21993
22036
of 6
Bill of Materials
Instrument Assembly – RCDT, LT, & LRCDs
Megger Part
Number
6140-377
6231-723
5310-446
25965-099
5310-357
5131-378
5160-324
5210-361
21264-227
5210-461
21819-527
21277-018
21138-014
17685-008
17641-672
5140-930
21814-737
6220-780
25511-841
6172-877
6172-059
18190-013
5270-848
5152-273
5210-454
6220-782
6220-785
6260-169
6260-170
5140-982
22420-084
25274-417
5174-171
5270-855
13497-095
18760-013
25132-017
21127-638
Description
LT310/320 PWR PCB ASSY (RE
LT320/RCDT320 DISPLAY PCB
WACL LT/RCDT300 RANGE
CASE KIT B (2 SWITCHES) (1)
TERMINAL PANEL MIT/LT/RCDT
SOCKET 4mm DIA.
INDEX SPIDER/SWITCH TOP**
CONTACT DISC
SPRING (ROTARY SWITCH)
SWITCH BOTTOM
**
SCREW PLASTITE No4 .5" PAN
KEYPAD LT320 (2)
SCREW M4x8 PAN POZI ST.ZP&
SCREW PT 3x6mm PAN HD THRE
PIN DOWEL 2x5mm ST.STEEL D
GREASE (PLASTICS) SPG3
GREASE SILICONE MOLYKOTE 4
FOAM STRIP 25x8x3
WASHER M4 LD-PE ANTI-LOSS
CARRY STRAP MIT/LT/RCDT30
BATTERY 1.5V (AA) ALKALINE
USER GUIDE CD MIT/LT/RCDT3
Qty
PCB Assemblies need to be exchanged as a pair. Contact
us with instrument serial number for further details
1
1
1
1
1
2
2
3
3
2
6
1
1
2
4
0
0
2
1
1
8
1
Cut wires set
CASE KIT A (2 SWITCHES) to Drg. Iss. 3
TERMININAL PANEL TO DRG. ISS.1
SOCKET 4MM DIA. BRASS NICKEL PLATED
INDEX SPIDER/SWITCH TOP DRG. ISSUE 2
Contact Disc to Drg. Iss. 1
SPRING (ROTARY SWITCH) DRG. ISSUE 1
SWITCH BOTTOM DRG. ISSUE 2
NO.4 X 1/2" SELF-TAPPING SCREW
Keypad to Drg. Iss.
SCREW M4 X 8MM, STEEL, ZINC
SCREW PT SIZE 3 PAN HD
STAINLESS STEEL DOWEL PIN 2x5mm DIN7 H8
GREASE FOR PLASTICS
GREASE, SILICONE BASED
FOAM STRIP 25 x 8 x 3
WASHER M4 ANTI-LOSS
CARRY STRAP TO DRG ISS. 1
BATTERY 1.5V (SIZE=AA) ALKALINE
USER GUIDE CD MIT/LT/RCDT300 TO DRG ISS 4
SHEET 1
WARRANTY CARD 3 YEAR MEG WARRANTY CARD - 3 YEAR (EDITION 4)
1
SLEEVING SILIC ID1.5,OD2.1
SILICONE RUBBER SLEEVING TO BS2848
1.2 m
LABEL SET LT320 (3)
1
PLUG CONTACT
PLUG CONTACT
3
INTERLOCK MIT/LT/RCDT300 S INTERLOCK TO DRG. ISS.1
1
LEADSET RED/BLK/GRN 1.5M L LEADSET RED/BLK/GRN 1.5M LT300 TO DRG. ISS. 2
1
POUCH MIT300
CARRY BAG TO DRG. ISS. 2
1
CARTON MIT/LT/RCDT300
CARTON MIT/LT/RCDT300 TO DRG. ISS 1
1
BLISTER INSERT
BLISTER INSERT TO DRG. ISS. 1
1
INSULATOR LT/RCDT300 SERIE
1
SPACER-10LG SNAP FIT NYLON SPACER, 10mm LONG, SNAP FIT, NYLON (PCB)
4
CABLE TIE 100x2.5mm T18R
DESCRIPTION: CABLE TIE, NYLON
3
SAFETY WARNING SHEET LT/RC SAFETY WARNING SHEET LT/RCD300
1
QUICKSTART LABEL LT300 (4)
QUICKSTART LABEL LT300 TO DRG ISS 4
1
RIBBON CABLE 30-WAY 40LG F RIBBON CABLE 30-WAY 40mm LONG 1mm PITCH
1
ADHESIVE/SEALANT 744RTV 31 ADHESIVE/SEALANT 744RTV
0.25 ml
CABLE SLEEVE NEOPR BLK 1.5 CABLE SLEEVE TO BS.3858, BLACK
3
PIN COILED, 1/8"DIA X 9/16
DOWEL PIN 1/8" DIA X 9/16" LG TO ISO 8750
2
Note: LT310 only has 1 switch and uses Case Kit A (6231-722)
Keypads and Labels
Instrument
Type
LT310
LT320
LT330
RCDT310
RCDT320
RCDT330
LRCD200
LRCD210
LRCD220
Keypad
5210-460
5210-461
5210-462
5210-463
5210-464
5210-465
5210-471
5210-471
5210-472
Instrument
Label Set
5270-847
5270-848
5270-849
5270-850
5270-851
5270-852
5270-873
5270-874
5270-875
Quick Start
Label
5270-855
5270-855
5270-855
5270-856
5270-856
5270-856
5270-877
5270-877
5270-877
Display PCB Assembly – LT, RCDT & LRCDs
Megger
Part
Number
6231-733
30000-023
30000-024
30000-050
Description
LT320/RCDT320 DISPLAY PCB
IC MULTIPLEXER ANOLOG 40
IC ANALOG SWITCH 3x2IN-PT
IC FLIP FLOP DUAL 74HC7
30000-052 IC OP-AMP J-FET
30000-078
30000-087
30000-102
6139-190
30000-180
30000-181
30200-036
30200-037
30200-041
31000-001
31000-002
31000-004
31000-005
31000-021
31100-007
31100-010
31300-004
32000-001
32000-002
32000-013
32000-017
32000-023
32000-025
32000-027
062
IC PHASE LOCK LOOP HEF4046
IC OP-AMP AD622AR
IC EEPROM 8Kx8 24C64 SO8
PROGRAMMED uP LT/RCD310/32
IC SHIFT REG 8-BIT SIPO HC
IC SHIFT REGISTR 8-BIT 74H
IC OP-AMP QUAD
LMV
IC PWM CONTROLLER TL5001
IC REGULATOR(SWICHING) LM3
TRANSISTOR NPN DRG 6180-39
DIODE SM
LL4
TRANSISTOR PNP DRG 6180-39
IC COMPARITOR (TAPE) LM
DIODE SM SCHOT 1A MBRS130
*TRANSISTOR MOSFET N, MMBF
TRANSISTOR MOSFET P, NDS35
DIODE SM FAST DUAL
BA
CAP SMD CER 330pF 10% 12
CAP SMD CER 470pF 10% 12
CAP SMD TANT' 2.2uF 20% 1
CAP SMD CER- 220nF 10% 12
CAP SMD ELEC'- 10uF 16V 04
CAP SMD CER- 10nF 10% 060
CAP SMD CER. 1nF 10% 060
32000-029 CAP SMD CER- 100nF -20+80%
32000-031 CAP SMD CER 33pF 5% 060
INTEGRATED CCT. 4051 ANALOGUE MULTIPLEXER
DESCRIPTION: IC 3x2 INPUT ANALOGUE SWITCH 4053
DESCRIPTION: INTEGRATED CIRCUIT DUAL FLIP
FLOPS
INTEGRATED CIRCUIT BASE NO.062 LOW POWER JFET
DESCRIPTION: IC PHASE LOCK LOOP
IC INSTRUMENTATION OP-AMP
IC 8Kx8 SERIAL EEPROM
IC SHIFT REGISTER 8-BIT 74HC164
IC SHIFT REGISTER 8-BIT 74HC165
IC OP-AMP QUAD RAIL-TO-RAIL LMV324
IC PWM CONTROLLER
IC SWITCHING REGULATOR LM3578
TRANSISTOR
DESCRIPTION: DIODE LL4148 75V 150mA
TRANSISTOR
DESCRIPTION: IC QUAD COMPARITOR
1A SCHOTTKY POWER RECTIFIER DIODE
DESCRIPTION:
TRANSISTOR MOSFET P-CHANNEL
DESCRIPTION: HIGH SPEED DUAL SERIES DIODE
SURFACE MOUNTED CERAMIC CAPACITOR ¤ ¤
SURFACE MOUNTED CERAMIC CAPACITOR ¤ ¤
CAPACITOR,TANTALUM,2.2UF,20%,
SURFACE MOUNTED CERAMIC CAPACITOR
ALUMINIUM ELECTROLYTIC SMD (CHIP)
SURFACE MOUNTED CERAMIC MULTILAYER
SURFACE MOUNTED CERAMIC MULTILAYER
CAPACITOR
SURFACE MOUNTED CERAMIC MULTILAYER
SURFACE MOUNTED CERAMIC MULTILAYER
Qty
2
2
2
1
1
1
1
1
1
2
1
1
1
8
15
2
2
2
6
3
1
1
1
1
1
6
11
5
35
2
32000-037 CAP SMD ELEC''100uF 20% 08
32000-041
32000-043
32000-070
33000-020
33000-027
33000-028
33000-031
33000-037
33000-038
33000-039
33000-040
33000-041
33000-042
33000-044
33000-051
33000-052
33000-068
33000-069
33000-070
33000-101
33000-033
34000-008
35000-015
35400-002
35965-009
5173-579
25995-013
5240-442
31000-039
32000-035
CAP SMD CER- 22nF 10% 120
CAP SMD CER 22pF 10% 060
CAP SMD ELEC'- 10uF 50V 06
RES SM- 7K5 MF 2% 1/8W 12
RES SM; 10R MF 1% 0.063W
RES SM; 33R MF 1% 0.063W
RES SM- 1K MF 1% 0.063W
RES SM- 10K MF 1% 0.063W
RES SM- 22K MF 1% 0.063W
RES SM- 33K MF 1% 0.063W
RES SM- 47K MF 1% 0.063W
RES SM- 68K MF 1% 0.063W
RES SM-100K MF 1% 0.063W
RES SM' 1M MF 1% 0.063W
RES SM' 10M MF 1% 1/4W 12
RES SM;220R MF 1% 1/8W 12
RES SM;300R MF 1% 0.063W
RES SM- 3K MF 1% 0.063W
RES SM- 30K MF 1% 0.063W
RES SM; 1R TF 1% 0.063W
RES SM- 2K2 MF 1% 0.063W
POT SMD 100K 25% 0.15W 4mm
CRYSTAL, 6MHz
HC49/4H
FUSE, 3A (T)SMD. NANO. R45
SOCKET SM 30-WAY 1mm FFC (
PCB BAR CODE LABEL
LABEL(CUSTOM) 6,35X24mm
DISPLAY PCB LT/RCDT300 SER
IC XOR GATE SINGLE I/P 74A
CAP SMD FILM, 1.0uF 5%
33000-035
33000-114
30000-084
31400-008
31500-003
33000-064
25960-045
25975-107
27900-061
27920-011
28920-098
6280-350
6180-433
27900-059
25925-004
RES SM- 4K7 MF 1% 0.063W
RES SM' 10M MF 1% 0.063W
IC OP-AMP DUAL TLE2022CD
ZENER SM 0.35W 5% 5.6V BZX
TRANSISTOR PNP BC807-25
RES SM; 0R0 TF 1% 0W 1206
HEADER 36-WAY
SWITCH PUSH SPNO PCB (NO P
INDUCTOR-220uH 0.24A AXIAL
BUZZER 1.5V 16ohm
T
LED RED HI-BRIGHT 600MCD 3
LCD MIT300 SERIES
BACKLIGHT MFT1502
INDUCTOR-220uH 0.6A 10% EL
WIRE LINK BARE 0.6mm DIA.
ALUMINIUM ELECTOLYTIC SMD CAPACITOR LONG LIFE
VERT
CAP SMD CER 22nF 10%
CAP SMD CER 22pF 50Vdc 10%
CAPACITOR SMD ELECTROLYTIC 10uF 50V
RESISTOR 7K5, 2%, 0.125W,
CHIP RESISTOR 10R 1% 0.063W
CHIP RESISTOR 33R 1% 0.063W
CHIP RESISTOR 1K 1% 0.063W
CHIP RESISTOR 10K 1% 0.063W
CHIP RESISTOR 22K 1% 0.063W
CHIP RESISTOR 33K 1% 0.063W 50V TC 100PPM
CHIP RESISTOR 47K 1% 0.063W
CHIP RESISTOR 68K 1% 0.063W
CHIP RESISTOR 100K 1% 0.063W 50V
CHIP RESISTOR 1M 1% 0.063W 50V
RES SM 10M 1% 0.25W
RES SM 220R 1% 0.125W
RESISTOR SM 300R MF 1% 0.063W 50Vdc
RESISTOR SM 3K MF 1% 0.063W 50Vdc
RESISTOR SM 30K MF 1% 0.063W 50Vdc
RES SM 1R TF 1% 0.063W
CHIP RESISTOR 2K2 1% 0.063W 50V DC
POTENTIOMETER 100K-25%-0.15W 50V
CRYSTAL 6MHz HC49
SURFACE MOUNT FUSE NANO SMF 3AMP TIME DELAY
SOCKET SM 30-WAY 1mm FFC (BOTTOM CONTACT)
CUSTOM LABEL 6,35X24 MM. 3 LABELS PER ROW
Display PCB to Drg. iss.1 A/W Ed.3
IC XOR GATE SINGLE INPUT
DESCRIPTION: SURFACE MOUNTED POLYESTER
CAPACITOR
CHIP RESISTOR 4K7 1% 0.063W
RESISTOR SM 10M MF 1% 0.063W 50V 100PPM
DUAL OP-AMP SMD
ZENER SM 0.35W 5% 5.6V BZX84
DESCRIPTION: TRANSISTOR SM BC807-25
DESCRIPTION: RES SM 0R0 1% 0W 1206 JUMPER LINK
HEADER, 36-WAY,
SWITCH PUSH BUTTON TACTILE PCB MOUNT 12x12mm
INDUCTOR 220uH 0.24A 10% Q=110 @ 500kHz
ELECTRO-MAGNETIC TRANSDUCER,
LED HIGH BRIGHT RED 600MCD 3mm
LCD MIT300 SERIES TO DRG. ISS. 1
Backlight to Drawing Iss. 1
INDUCTOR 220uH 0.6A 10% 0.29ohms
WIRE LINK 0.6mm DIA. CU. TINNED BANDOLIERED
Variations
LT310, RCDT310, LRCD200 & LRCD210 have no backlight fitted.
LT330, RCDT330 have programmed uP no. 6139-194
2
1
1
4
1
6
2
26
56
2
1
2
1
18
11
1
2
4
3
12
1
1
1
1
1
1
1
1
1
3
2
4
1
1
1
1
1
0.2
1
1
1
3
1
1
1
1
Power PCB Assembly – LT, RCDT & LRCDs
6231-735
5240-443
30000-015
30000-052
30000-055
30100-017
31000-001
31000-002
31000-003
31000-005
31000-018
31100-007
31500-003
32000-004
32000-023
32000-025
32000-027
32000-029
32000-030
32000-043
32000-070
33000-027
33000-029
33000-030
33000-031
33000-033
33000-034
33000-037
33000-040
33000-041
33000-042
33000-044
33000-060
33000-069
33000-100
33000-112
33000-114
35965-010
5173-579
25995-013
25413-306
25955-028
25960-118
25980-056
26836-077
26836-706
26837-116
26837-130
26837-134
26837-175
26900-008
26900-029
26900-188
LT310/320 PWR PCB ASSY (RE
POWER PCB LT/RCDT300 SERIE
IC DUAL MONO 74HC123 (NOT
IC OP-AMP J-FET 062
IC OP-AMP PRECISION OP07CS
IC ANALOG SWITCH SPSW DG21
TRANSISTOR NPN DRG 6180-39
DIODE SM
LL4
IC OP-AMP QUAD (TAPE) LM
IC COMPARITOR (TAPE) LM
IC OP-AMP JFET QUAD TL064
*TRANSISTOR MOSFET N, MMBF
TRANSISTOR PNP BC807-25
CAP SMD CER- 100nF 10% 12
CAP SMD ELEC'- 10uF 16V 04
CAP SMD CER- 10nF 10% 060
CAP SMD CER. 1nF 10% 060
CAP SMD CER- 100nF -20+80%
CAP SMD CER 100pF 5% 060
CAP SMD CER 22pF 10% 060
CAP SMD ELEC'- 10uF 50V 06
RES SM; 10R MF 1% 0.063W
RES SM;100R MF 1% 0.063W
RES SM;330R MF 1% 0.063W
RES SM- 1K MF 1% 0.063W
RES SM- 2K2 MF 1% 0.063W
RES SM- 3K3 MF 1% 0.063W
RES SM- 10K MF 1% 0.063W
RES SM- 47K MF 1% 0.063W
RES SM- 68K MF 1% 0.063W
RES SM-100K MF 1% 0.063W
RES SM' 1M MF 1% 0.063W
RES SM- 18K MF 1% 1/8W 12
RES SM- 3K MF 1% 0.063W
RES SM-470K MF 1% 0.063W
RES SM- 15K TF 1% 0.063 0
RES SM' 10M MF 1% 0.063W
SOCKET SM 30-WAY 1mm FFC (
PCB BAR CODE LABEL
LABEL(CUSTOM) 6,35X24mm
FUSE, 2A(F)HBC 600V 50KA 3
FUSE CLIP 1 1/4" LOW PROFI
HEADER 1-WAY (CLIP-IN)
RELAY SP C/O 250 VAC 8A 5V
RES; 33R MF 2% 0.75W
RES;100R WW 5% 12W
RES;100R FUSIBLE 5% 7W
RES' 10M0 MG 1% 0.5W
RES-390K MG 5% 0.5W
RES; 3R3 WW 1% 3W P
RES; 20RO MF 1% 0.25W
RES;150R0 MF 1% 0.25W
RES; 1R3 MF 1% 0.25W
POWER PCB TO DRG. ISS. 2 A/W Ed. A4
DESCRIPTION: IC DUAL MONOSTABLE
INTEGRATED CIRCUIT BASE NO.062 LOW POWER J-FET
INTEGRATED CIRCUIT, PRECISION OP-AMP, BASE NO. 07
DESCRIPTION: IC ANALOG SWITCH SPSW DG212BD
TRANSISTOR
DESCRIPTION: DIODE LL4148 75V 150mA
INTEGRATED CIRCUIT,QUAD OP-AMP
DESCRIPTION: IC QUAD COMPARITOR
IC QUAD OP-AMP JFET TL064
DESCRIPTION:
DESCRIPTION: TRANSISTOR SM BC807-25
SURFACE MOUNTED CERAMIC CAPACITOR ¤ ¤
ALUMINIUM ELECTROLYTIC SMD (CHIP)
SURFACE MOUNTED CERAMIC MULTILAYER
SURFACE MOUNTED CERAMIC MULTILAYER CAPACITOR
SURFACE MOUNTED CERAMIC MULTILAYER
SURFACE MOUNTED CERAMIC MULTILAYER
DESCRIPTION: CAP SMD CER 22pF 50Vdc 10%
CAPACITOR SMD ELECTROLYTIC 10uF 50V
CHIP RESISTOR 10R 1% 0.063W
CHIP RESISTOR 100R 1% 0.063W
CHIP RESISTOR 330R 1% 0.063W
CHIP RESISTOR 1K 1% 0.063W
CHIP RESISTOR 2K2 1% 0.063W 50V DC
CHIP RESISTOR 3K3 1% 0.063W 50V DC
CHIP RESISTOR 10K 1% 0.063W
CHIP RESISTOR 47K 1% 0.063W
CHIP RESISTOR 68K 1% 0.063W
CHIP RESISTOR 100K 1% 0.063W 50V
CHIP RESISTOR 1M 1% 0.063W 50V
DESCRIPTION: RES SM 18K 1% 0.125W 1206
DESCRIPTION: RESISTOR SM 3K MF 1% 0.063W 50Vdc
RESISTOR 470K MF 1% 0.063W
RESISTOR SM 15K TF 1% 0.063W RC22H
RESISTOR SM 10M MF 1% 0.063W 50V 100PPM
SOCKET SM 30-WAY 1mm FFC (TOP CONTACT)
CUSTOM LABEL 6,35X24 MM. 3 LABELS PER ROW
FUSE, 2 AMP,(F) HBC. CERAMIC
¤¤
1 1/4" LOW PROFILE PCB MOUNT FUSE CLIP
DESCRIPTION: HEADER, 1-WAY (CLIP-IN)
RELAY SINGLE POLE C/O 250 VAC 8A 5V COIL
RESISTOR, METAL FILM.
RESISTOR 100.00R TOL 5% 7.0 WATT WIRE WOUND
RESISTOR 10M 1% 0.5W 2500V METAL GLAZE
RESISTOR 390K 5% 0.5W 400V
RESISTOR WIREWOUND PRECISION
RESISTOR 20R 1% 0.25W
RES MF 150R 1% .25W MFR4
RESISTOR, METAL FILM,
1
1
1
3
1
1
5
15
1
1
1
4
2
4
3
3
4
14
10
1
2
1
1
2
8
1
2
33
8
1
2
5
1
4
4
1
1
1
1
1
2
4
3
1
1
1
1
10
1
2
2
2
2
27920-039
28863-078
28863-082
28863-160
29650-006
25925-004
13489-326
21189-015
21813-304
21810-601
18760-013
5131-418
29550-009
ZENER TVS.600W 440V UniDir
ZENER 0.4W 5%'15V DO35 BZX
DIODE,1N4007 1A-1000V
DIODE,1A 1000V BA159
TRANSISTOR NPN MJF31C
WIRE LINK BARE 0.6mm DIA.
WIRE 1/0.6 PTFE WHITE TYP
STUD M3x12LG SELF CLINCHIN
WASHER M3 CRINKLE BER.Cu
NUT M3 FULL STEEL N.P
ADHESIVE/SEALANT 744RTV 31
HEATSINK 2mm LT300
TRANSISTOR MOSFET N, FQA11
TRANSIENT SUPPRESSOR 600W/MS VBR-440V CB417
ZENER DIODE 15V 0.4W
DIODE ,
TRANSISTOR NPN N-CHANNEL MJF31C
WIRE LINK 0.6mm DIA. CU. TINNED BANDOLIERED
1/0.6MM H.C.COPPER WIRE,
STUD M3x12LG SELF CLINCHING
M3 CRINKLE WASHER TO BS.4463,
M3 FULL NUT, HEXAGONAL, TO
ADHESIVE/SEALANT 744RTV
HEATSINK TO DRG. ISS. 1
TRANSISTOR MOSFET N-CHANNEL
Variations:
Relays:
If no relays are fitted, only one fuse (FS2) needs to be fitted
Transistor TR46 29550-009 is fitted to LTs and LRCDs
Transistor TR37 29550-008 is fitted to RCDTs
Resistor 91Ω 26836-214 fitted to RCDTs
Resistor 100Ω 26836-706 fitted to LTs and LRCDs
2
1
12
1
1
1
0.08
2
2
2
0.5
1
1
Appendix 1 - Display Messages
A2d – diagnostic test ad converter
AC – ac rcd test selected
AC.S – ac selective rcd test selected
ALL – with dEL, delete all
bAT – diagnostic test battery
bXY – (distribution) board number XY
CAL – calibrate mode selected
CAL – diagnostic test, read calibration constants
CAL – calibration was successful
cAL – calibration flag status, instrument is calibrated
CEN – diagnostic test keys, centre button pressed
CH.O – checksum flag status, checksum OK
CH.F – checksum flag status, checksum failed
CH.F – checksum failed warning at start-up
chk - check connections, no current detected, test could not be performed
chk (+ warning triangle) chX – diagnostic test ad converter, channel number (0 – 7)
CON – diagnostic test, contrast on display
CUS – customer mode selected
cXY – circuit number XY
dC – dc rcd test selected
dc.S – dc selective rcd test selected
dEb – debug mode selected
dEC – decalibration was successful
dEC – decalibrate mode selected
dEC – decalibration warning
dEL – delete
diA – diagnostics mode selected
EAS – diagnostic test keys, east (right) key pressed
ESC – escape fomr storage screen
EEP – diagnostic test eeprom, transmit contents
EXY – error number XY (2 digit error number)
eXY – error number (XY + 100) ***
Hot – FET too hot for test to proceed
hot – resistors too hot for test to proceed
INV – invalid result which cannot be stored
kEy – diagnostic test, keys
LEF – diagnostic test keys, left-hand key pressed
LIN – diagnostic test. Links
L-L – line-line connection
L-N – line-neutral connection
L+L – LN swap setting, LN swap tests allowed
L+N – LN swap setting, LN swap tests not allowed
NEU – neutral fault
NOC – no calibration (calibration failed)
NOR – diagnostic test keys, north (up) key pressed
NOS – no shutdown mode selected
noS – noise on supply
nXY – wire number
N-E – neutral-earth connection
oFF – diagnostic test, switch–off
OFF – switch off imminent
OK – ok, acknowledge of result stored or deleted
Pot – diagnostic test, balance pot set-up
PX – phase number
PXY – diagnostic test ad converter, port number
REF – reference value not set before doing ‘R1+R2’ loop test
RIg – diagnostic test keys, right-hand key pressed
RS.P – diagnostic test, rotary switch, primary
RS.S – diagnostic test, rotary switch, secondary
Snd – send
SEt – set-up menu
SOU – diagnostic test keys, south (down) key pressed
SPA – diagnostic test keys, spare key pressed
tES – test mode selected
tFE – diagnostic test, temperature of fet
trE – diagnostic test, temperature of resistors
trP – supply tripped unexpectedly
t X – auto rcd test phase
uNC - calibration flag status, instrument is uncalibrated
UNC – uncalibrated warning at start-up
USb – usb mode selected
VES – diagnostic test keys, west (left) key pressed
VX.Y – firmware version number at start-up
>25V – contact voltage limit exceeded
>50V – contact voltage limit exceeded
<xyzV – insufficient supply voltage for test to begin
->xyz – job number xyz
Appendix 2 - Manual Test Procedure
Loop Testers (and Loop Test functions on Loop/RCD testers).
In the Dover factory, instruments are calibrated and tested automatically using a PC.
Manual calibration is not possible, contact [email protected] for details of the
options available.
This is a Manual test procedure for the LT310, LT320 and LT330 instruments, and for
the loop test functions on LRCDs. Note that some instruments allow for Neutral and
Line to be swapped, and the tests need to be repeated in this configuration.
Switch instrument on, battery voltage = 12V, measure battery drain < 50mA after 5s.
Switch instrument to V, connect voltages as indicated and read display
L-N, L-PE = 230V 50Hz
L-N, L-PE = 440V 50Hz
L-N, N-E = 240V 50Hz
230 +/- 6V
440 +/- 10V
240 +/- 6V
Switch to the indicated range. Switch the 2nd function switch to the 'Z' position, if
present. Connect to loop resistance close to suggested value and press the test button.
Hi Current Loop Test
953
165
90
20
10
1
0
+/- 50 digits
+/- 14 digits
+/- 5 digits
+/- 1.5 ohms
+/- 1 ohm
+/- 8 digits
+/- 3 digits
No Trip Loop Test
953
165
90
20
10
1
0
+/- 50 digits
+/- 14 digits
+/- 5 digits
+/- 1.5 ohms
+/- 1 ohm
+/- 8 digits
+/- 3 digits
Checking No Trip Loop Test Current.
The No-trip loop current is intermittent and cannot be measured directly with a
multimeter. However, the magnitude of the current is the same as that used during a
30mA ½ I rcd test.
On an LT310, this check cannot be performed.
On an LRCD210 or LRCD220 select ‘1/2 I’ and ‘30mA’ directly on the rotary switches.
On an LRCD200 or LT320, proceed as follows:
1). Switch the instrument 'on', while simultaneously holding down the 'TEST' button,
the upper left-hand button and the upper right-hand button.
2). The instrument should display ‘CUS’. Release the buttons.
3). Press the ‘TEST’ button. The instrument should display a 3-digit code, e.g. ‘L2R’
4). Press the upper left-hand button until the code is ‘R1R’
5). Turn the main rotary switch to accept the new code. Do not switch OFF.
6a). On an LRCD200, select ‘I’ and ‘30mA’.
6b). On an LT320, select ‘No Trip’ and ‘Z’.
Now perform the measurement:
1). Connect an a.c. current meter to measure the current flowing in the circuit Line to
PE.
2). Connect the instrument to a mains supply.
The current meter should read about 0.5-0.75mA.
3). Press the test button.
The instrument will now do a 15mA test of 2 seconds duration.
The reading on the current meter will vary until it stabilizes at about 14mA. This should
be less than 15mA. Do not use peak hold.
Switch instrument OFF to restore to normal operation.
Final Checks
1. Fit blank grey label to hole in battery compartment.
2. Insert batteries and secure battery compartment
3. Open case by folding lid to the back and clicking it into position.
4. Visually check external appearance. Check the gap between the two halves of the
case.
5. Turn on to V. Observe the version number (e.g. V1.0), and the three L-PE, L-N and
N-PE LEDs light briefly.
6. Instrument should say --- V, arc should be display with pointer at 0, and battery
indicator should show full.
7. Press backlight button (if applicable) and check backlight works.
8. Press PFC, <0°/180°> <Lock> and <TEST> buttons (if applicable) and check and
beep.
9. Rotate main switch through ranges and check for end stops and correct display – i.e.
V
arc and ---V
Hz
--- Hz
No Trip
---V and closed switch
Hi (if present)
---V and open switch
10. Check end stops work on 2nd function switch (if fitted).
11. Switch to OFF and watch display go out.
RCD Testers (and RCD Test functions on Loop/RCD testers).
In the Dover factory, instruments are calibrated and tested automatically using a PC.
Manual calibration is not possible, contact [email protected] for details of the
options available.
This is a Manual test procedure for the RCDT310, RCDT320, RCDT330, LRCD200,
LRCD210 & LRCD220 instruments. Note that some instruments allow for Neutral and
Line to be swapped, and the tests need to be repeated in this configuration.
Switch instrument on, battery voltage = 12V, measure battery drain < 50mA after 5s.
Switch instrument to V, connect voltages as indicated and read display
L-N, L-PE = 230V 50Hz
L-N, L-PE = 440V 50Hz
L-N, N-E = 240V 50Hz
230 +/- 6V
440 +/- 10V
240 +/- 6V
Test Currents
The no-trip (1/2I) current can be measured (not LRCD200) as follows:
1) Connect a.c. current meter to measure the current following in the circuit Line to
PE.
2) Select the RCD Rating and 1/2I RCD Test.
3) Meter should read about 0.5-0.75mA. Press the test button and the reading on the
current meter will vary until it stabilizes to a reading. Do not use peak hold.
The 'trip' (I) current can be measured as follows
1) Connect a.c. current meter to measure the current following in the circuit Line to
PE.
2) Select the RCD Rating and I RCD Test.
3) Press the 'type' button and the display should brief display 'AC.S'. Since the
instrument is now set to selective, the test current will flow for two seconds.
4) The meter should read about 0.5-0.75mA. Press the ‘TEST’ button once to start the
test, and then again when the count begins. The reading on the current meter will
vary until it stabilizes to a reading. Do not use peak hold.
RCD
Rating
10mA
30mA
100mA
300mA
500mA
1000mA
1/2I
(mA)
4.6-4.9
13.8-14.7
46-49
138-147
230-245
460-490
I
(mA)
10.2-10.8
30.6-32.4
102-108
306-324
510-540
1020-1080
It is not possible to measure the 5I test currents or the ramp test currents, but this is all
generated from the same circuit as used for the 1/2I and I test currents. Similarly
dc-sensitive test current cannot be measured.
The contact voltage can also be checked. This is a measurement of the loop resistance,
but displayed as a voltage. It is the voltage that would be expected to be dropped across
the loop resistance if the rated current of the RCD was flowing in the circuit.
Therefore
V = Idn * Rloop
In most installations this needs to be less than 50V; in agricultural installations 25V.
In some cases the display of this voltage will need to be turned on. This can be done by:
1). With the instrument switched OFF, hold down the ‘TEST’ button and turn the range
knob to any ON position.
2). Keep the button held down until the instrument displays the ‘SET’ warning.
3). Now release the ‘TEST’ button.
4). Press the ‘TEST’ button twice to view the current settings for the touch voltage.
The display shows the fault voltage limit, ‘25 V’ or ‘50 V’.
If the fault-voltage display is active, a bar-graph display will also appear.
5). Press the ‘TYPE’ button to turn bar-graph display ON or OFF. Switch ON.
6). Press the ‘TEST’ button to exit from the set-up menu.
The normal test is with a loop resistance of 900Ω on the 30mA rated current setting.
This will give a calculated contact voltage of 27V, or a display of 28 to 31V. (+5% to
+15%).
Appendix 3 – LT3X0/RCDT3X0/LRCD2X0 Error Numbers
03
.
.
.
16
17
18
19
20
.
.
.
39
40
.
42
43
44
.
.
.
53
.
.
.
58
.
.
.
75
No acknowledgement from eeprom
Unstable data from keys or configuration links
Unstable data from rotary switches
Invalid data from range switch
Invalid data from secondary switch
Unstable data from battery measurement
Resistor temperature is out of range
Fet temperature is out of range
Input frequency is too high
Battery voltage is too high
Battery voltage is too low
Shutdown failed, power has not turned off
Instrument. type incompatible with hardware configuration
Eeprom error during result storage.
Appendix 4 - Diagnostic Tests
There are several ways to access diagnostics - choose the most convenient method.
In each case, the display shows the message ‘diA’.
It is usually possible (but not always) to exit diagnostics by turning the turn the range
switch to OFF.
Method 1. (disassembled instrument)
Fit link LK3
When viewing the display board from the display side, locate the position of the middle
switch in the row of three. LK3 is the closest link at the upper left. The orientation is
north-south.
Method 2. (disassembled instrument)
Move the range switch to the diagnostics position
This is located beyond the normal operating positions.
The exact location depends on instrument type.
Method 3. (assembled or disassembled instrument)
Send the serial command ‘W’
Method 4. (fully assembled instrument)
Use the ‘secret’ menus.
With the instrument switched OFF, hold down the TEST button, the top left-hand
button and the top right-hand button, then turn the range knob to any ON position.
Keep the buttons held down until the instrument displays the current operating mode,
normally ‘CUS’ (customer mode). Now release the buttons.
Press the ‘LOCK/DEGREE’ button until the display shows ‘NOS’.
Hold down the top right-hand key and then press the left-hand key.
The display shows ‘diA’
Press the TEST button to begin the first diagnostic test.
Diagnostic test sequence
Test 1 - Display
All display segments, backlight, led ‘neons’, and all power supplies are turned ‘on’.
Hold down any button except the TEST button to sound the buzzer.
Press the TEST button to step to the next test.
Test 2 – Keys
Message - ‘KEY’.
The neons and +/-15V supplies are turned off.
Hold down any key.
The display shows a code according to which button is pressed
Top row left – LEF
Top row centre – CEN
Top row right – RIG
North – NOR
South – SOU
East – EAS
West – VES
Test – TES
Press the TEST button and one other to step to the next test.
Test 3 – Battery voltage
Message - ‘bAt’.
The battery voltage and battery symbol are displayed
The data is also transmitted via the serial interface
Press the TEST button to step to the next test.
Test 4 – FET temperature sensor
Message - ‘tFE’
The temperature reading in Celsius is displayed, along with the ‘0°’ symbol.
The data is also transmitted via the serial interface
Press the TEST button to step to the next test.
Note: There is a shortcut to this procedure from the ‘diA’ screen. Hold down the top
right-hand button and press the centre button.
Test 5 – Power resistors temperature sensor
Message - ‘trE’
The temperature reading in Celsius is displayed, along with the ‘0°’ symbol.
The data is also transmitted via the serial interface
Press the TEST button to step to the next test.
Test 6 – A/d converter
Message - ‘A2d’
Display shows ‘P0’, then ‘ch0’ to identify Port 0 channel 0, then shows the actual a/d
reading. This is the average of 100 readings with sample and hold ‘on’. The converter is
used in 10-bit mode, so the range of the reading is 0 – 1023.
Press the ‘LOCK/DEGREE’ key to step sequentially through all the ad channels.
After channel 7 the test moves on through the Port 2 channels and then through Port 10
channels.
Since port 2 and half of port 0 are used for the display, the display driving is suspended
for a short time while these channels are sampled. They should return values near zero.
Press the TEST button at any point to step to the next test.
Test 7 – Primary rotary switch (Range switch)
Message - ‘RS.P’
Shows the numbers of the ‘a’ and ‘b’ tappings as read from the range switch.
Led neons are turned off.
The display shows tapping ‘b’ number on the left, and tapping ‘a’ number on the right,
with ‘P+’ in the centre to identify the Primary switch. Note that the instrument cannot
be switched off during this test.
Press the TEST button to step to the next test.
Test 8 – Secondary rotary switch (Second switch)
Message - ‘RS.S’
Shows the numbers of the ‘a’ and ‘b’ tappings as read from the second switch.
Led neons are turned on as an indicator to the second switch.
The display shows tapping ‘b’ number on the left, and tapping ‘a’ number on the right,
with ‘S+’ in the centre to identify the Secondary switch.
Press the TEST button to step to the next test.
Test 9 – Mode links
Message - ‘LIN’
Shows the status of mode links LK1 to LK8
The display shows the data as ‘LXY’ where ‘XY’ is a hexadecimal byte in which ‘Y’
represents LK1 – LK4, and ‘X’ represents LK5 – LK8.
Press the TEST button to step to the next test.
Test 10 – Display Contrast
Message - ‘CON’
Show/modify the display contrast.
The display shows a number accompanied by the ‘0°’ symbol, to indicate the contrast as
a percentage of the maximum. This is also represented on the bargraph display.
The default setting is 44%.
PFC/TYPE button - increase contrast
NORTH/UP button – increase contrast
LOCK/DEGREE button - reduce contrast
SOUTH/DOWN button - reduce contrast
WEST/LEFT button - set to minimum contrast
EAST/RIGHT button - set to maximum contrast
SPARE button - reset contrast to default 44%
Press the TEST button to step to the next test.
Test 11 – Calibration constants
Message - ‘CAL’
Transmits all the data via the serial interface, and then displays the calibration constants
one-by-one.
Displays ‘0’ followed by the value of calibration constant 0.
Press the LOCK/DEGREE button to step to the next constant. There are 64 altogether.
The default setting is 1.000 for constants 0 – 31, and 0.000 for constants 32-63.
Press the TEST button at any time to step to the next test.
Test 12 - Pot adjust
Message - ‘Pot’
For correct measurement of loop resistances, the time-constants of the two branches in
the ‘2-armed’ circuit need to be closely matched. This is done by adjusting the series
resistance in one of the arms using a potentiometer. This diagnostic procedure provides
a way of performing the adjustment. Tests are carried out as a pair, each test measuring
the voltage difference between the two capacitors. Alternating tests reverse the roles of
the capacitors - each one being either unloaded or loaded (15mA). The displayed
reading is a rolling average of the difference in the pairs of readings.
An input of at least 50V a.c. must be applied. If this is not present, the display shows
‘Vol’. After a few seconds, the display gives the result in both analog and digital
formats, along with an arrow showing which way to turn the pot (as viewed from the
pot side of the board).
Adjust R63 for a minimum reading (less than +/-10 counts).
Press the TEST button at any time to step to the next test.
Note: There is a shortcut to this procedure from the ‘diA’ screen. Hold down the top
right-hand button and press the left-hand button. (Not available on the 310). The pot
adjust routine begins automatically. Another shortcut is to fit LK7, which allows the
procedure to be executed immediately after the start-up sequence.
Test 13 – EEPROM
Message - ‘EEP’
The entire content of the eeprom is transmitted via the serial interface.
It is arranged as hex bytes and formatted into rows and columns, with addresses at the
start of each row. The led neons show progress via a pattern which changes every
kilobyte.
Press the TEST button at any time to step to the next test.
Test 14 – Power down
Message - ‘oFF’
The microcontroller continuously asserts the ‘POWER OFF’ signal.
The instrument should switch off after a couple of seconds.
Appendix 5 - Common Faults
Appendix 6 - Firmware updates
310/320
V1.0
V1.1
V1.2
V1.3
330
V2.0
V1.4
V1.5
V1.6
V2.1
V2.2
V2.3
Details
used for first 50 loop testers
Improvements in automatic cal and test
first RCD testers
fixed bugs in variants (switched RCD, Spanish) and improvements in
automatic cal and test
Fixed problems with 50V-0-50V supplies
Fixed false ‘noise’ indication on some RCD/RCBOs
LRCD range introduced
Appendix 7 - Hardware updates
RCD Testers only: Change R251 to 91 ohms because a number of instruments were
failing low on 1A test.
LT330 and RCDT330 instruments
These instruments benefit from a USB connection, allow download of stored results to a
PC
They differ in that a different microprocessor is fitted, and also a bigger EEPROM in
which the results are stored. Also an extra board is fitted containing an isolated USB
interface.
The USB interface uses the Texas Instrument TUSB3410. To use this, 'driver' software
is required on the PC, and this is available for Microsoft Windows XP, 2000, ME and
98SE. This software is supplied with the instrument on the Download Manager CD, or
can be downloaded free of charge from the Texas Instruments website. (Go to
www.ti.com, and search for TUSB3410VCP and follow the instructions to download
the latest version.)
Install this software BEFORE connecting the instrument.
Basic fault-finding
Operation of the interface board can be checked by installing the driver software on a
PC and then looking at the System Properties (Settings->Control Panel->System and
then the System Properties tab). Check on the 'Ports COM and LPT'. Connecting an
instrument will give you an extra COM port labelled UMP3410 Serial Port COMxx
To further check the interface board, run HyperTerminal or other RS232 interface
program, and select the COM port labelled above (Connect the instrument FIRST)
Change the configuration to 9600 baud, 8 bits, no parity, 1 stop bit and no flow control.
Switch to any (on) position other than send and type in a 's', and the message "Select
SEND on instrument" will be received.
Assembly and Disassembly
The USB Board is fitted in one corner of the case, and connected to the display board
by four wires. A replacement PCB is available, order from Service at Dover
([email protected]).
Fixing Screws
USB PCB
MIT pin 1 (Red)
this end
LT, RCDT pin 1
this end
BOM
Description
Megger Part
Number
5140-981
30000-102
30200-004
31000-001
31000-002
32000-018
32000-038
32000-043
32000-044
33000-005
33000-028
33000-031
33000-032
33000-037
33000-042
33000-044
33000-070
33000-103
35000-013
30000-188
5173-579
25995-013
USB PCB
MIT/LT/RCDT3
IC EEPROM 8Kx8 24C64 SO8
IC REGULATOR 3.3V LM117DTX
TRANSISTOR NPN DRG 6180-39
DIODE SM
LL4
CAP SMD CER- 100nF 10% 18
CAP SMD TANT'- 10uF 20% 35
CAP SMD CER 22pF 10% 060
CAP SMD TANT' 1uF 20% 222
RES SM' 10M MF 10% 1/8W 1
RES SM; 33R MF 1% 0.063W
RES SM- 1K MF 1% 0.063W
RES SM- 1K5 MF 1% 0.063W
RES SM- 10K MF 1% 0.063W
RES SM-100K MF 1% 0.063W
RES SM' 1M MF 1% 0.063W
RES SM- 30K MF 1% 0.063W
RES SM;220R TF 1% 0.063 0
CRYSTAL,12MHz HC49/4H
IC USB TO SERIAL CONVERTER
PCB BAR CODE LABEL
LABEL(CUSTOM) 6,35X24mm
33000-029
25960-066
25965-178
29350-002
6140-381
RES SM;100R MF 1% 0.063W
HEADER 72-PIN DIL
SOCKET USB B-TYPE PCB MTG
OPTO ISOLATOR 10KV OPI1
WACL USB TO MAIN PCB MIT/L
Qty
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1
1
1
2
1
3
2
4
1
2
3
5
1
3
2
1
1
4
1
1
1
1
1
0.072
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1