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NEVO
N O+ 60
00 se
eries
User
U
Manu
ual
The
e NEVO+ serries user ma
anual has been prepared
d by the Vox Power desig
gn team to assist
a
qualifie
ed engineers
s in
corrrectly implementing the
e product and
d to achieve
e the best reliability and performance
e.
At time of print, the
e information co
ontained in this document is be
elieved to be correct and accura
ate. However, specifications
s
arre subject to cha
ange
with
hout prior notice
e and Vox power will not be liab
ble for any dam
mage caused as a result of the information with
hin this document. For continue
ed
prod
duct improveme
ent, please repo
ort any errors co
ontained in the document to Vo
ox Power Ltd.
NE
EVO+ series overview
The
e NEVO+600 s
switch mode power
p
supply series offers truly
t
unrivalled power dens
sity, providing 600 W at 25 W/in3 in a 5” x
3”x 1U package. It is the ultim
mate power so
olution for systtem designers
s as they addrress the press
sing demands for more pow
wer
with
hin less space
e. Providing multiple
m
isolate
ed outputs, the
e series carry full UL60601 (NEVO+600M
M only) and UL60950
(NE
EVO+600S only) safety app
provals.
The
e basic system
m consists of an
a input modu
ule together with
w
up to fourr fully isolated output modu
ules. Single ou
utput modules
s
hav
ve advanced remote voltage
e and current programming
g functionality
y as standard. While dual ou
utput modules
s allow for up to
eigh
ht fully isolate
ed outputs.
The
e input module
e delivers up to
t 600 W of output
o
power and
a
has 4 slotts, each capab
ble of separately delivering up to 150 W.. A
5 V,
V 200 mA med
dically isolated
d bias supply together with
h an AC_OK signal and a glo
obal inhibit sig
gnal that can disable all
outputs simultan
neously, comes as standard on all models
s.
Outtput modules are available in a range of output voltag
ges to suit all applications.
a
Sing
gle output mo
odules with vo
oltage ranges from 1.5V to 60V, currents
s up to 25A an
nd paralleling and series capability can
resu
ult in a voltag
ge range up to
o 240V and a maximum currrent of up to 100 Amps fro
om a single Ne
evo+600 conffiguration.
Dua
al output mod
dules have a voltage
v
ranges
s from 1.5V to
o 15V and currents up to 5A
A with series capability.
c
By selecting the correct output modules, a custom powerr solution can be configured
d in a few min
nutes. This ins
stantly availab
ble
custom solution offers
o
industry
y leading pow
wer density, to
otal system effficiencies of up
u to 89% and
d suits all type
es of applicatio
ons
a
military and tele
ecoms.
including industrial, medical, aerospace,
2
Contents
NEVO+ series overview ...................................................................................... 1 Part numbers and ordering information ................................................................ 4 Installation Notes .............................................................................................. 5 Theory of operation ........................................................................................... 6 Input module operation ...................................................................................... 7 Signalling ........................................................................................................10 Single Output module operation .........................................................................12 Advanced Single Output module features ............................................................15 Series Connected outputs ..................................................................................18 Paralleled outputs .............................................................................................19 Dual Output module operation ...........................................................................23 Audible noise ...................................................................................................26 Mechanical dimensions and mounting..................................................................27 Connectors ......................................................................................................28 Configuring your power supply ...........................................................................29 Safety .............................................................................................................31 EMC compliance ...............................................................................................32 Reliability ........................................................................................................33 3
4
Part numbers and ordering information
INPUT MODULES
Model NEVO+600S NEVO+600M Details 600 Watt input stage with standard leakage current.
600 Watt input stage with medical leakage current and isolation requirements.
OUTPUT MODULES
Model 0 1 2 3 4 5 6 7 Nominal voltage Rated current Rated Power
5V 12V 24V 48V 12V Dual 3.3V Dual 12V/3.3V Dual 25A 15A 7.5A 3.75A 5A 5A 5A 125W
150W 150W 150W
75W x 2
25W x 2
75W/25W
Adjustment range
Unused slots
1.5V‐7.5V
3V‐15V 9V‐30V 18V‐58V
5V‐15V Each Ch
1.8V‐5V Each Ch
5V‐15V/1.8V‐5V
Load regulation
Line regulation OVP
±50mV
±100mV ±150mV ±300mV
±50mV
±50mV
±50mV
±0.1%Vnom ±0.1%Vnom ±0.1%Vnom ±0.1%Vnom ±0.1%Vnom ±0.1%Vnom ±0.1%Vnom 9V
18V 36V 66V
20V
8V
20V/8V
PART NUMBERING SYSTEM NEVO Input Module Product Type S ‐ Standard M ‐ Medical NEVO+600 Slot A – Output # Slot D – Output # Slot B – Output # Slot C – Output # When initially ordering non‐nominal voltage settings add “ /Voltage” after each output # where a special voltage setting is required E.g. If 3.30Vdc is required in slot B and all other slots require nominal voltages then use: NEVO+600M – 1 – 1/3.30 – 2 ‐ 3 The factory will then issue a 3 digit code for your specific configuration that can be used for all future orders of the same configuration When ordering an input unit with no outputs inserted, simply order NEVO+600M or NEVO+600S M ‐
1
1
2
3
‐
0
0
0
Factory Use Use ‘0’ for unused slots. Blanking plates will be inserted at factory 5
Installation Notes
This power supply is intended for use within equipment or enclosures which restricts access to authorised personnel only. The
instructions in this manual and all warning labels on the product must be followed carefully.
Safety
All power supplies must be installed correctly in a controlled environment which restricts access to any unauthorised
personnel. Equipment and system manufacturers must protect service personnel against unintentional contact with the output
terminals.
Hazards
If series and/or parallel combinations of outputs exceed safe voltage and/or energy levels, the final equipment manufacturer
must provide appropriate protection for both users and service personnel.
Health and safety
To comply with section 6 of the health and safety at work act, a label that is clearly visible to service personnel must be placed
on the final equipment, which warns that surfaces of the power supply may be hot and should not be touched when the
product is operating.
Fusing
The power supply has internal single pole fusing in the L (Live) line.
Servicing
The power supply contains no user serviceable parts. Repairs must be carried out by authorised personnel only. Contact Vox
Power Ltd for further information.
Cooling
For proper cooling of the power supply, the air intake and outlet must not be impeded. Allow 50 mm clearance at both ends
and position cabling appropriately. Avoid excessive back pressure in the general system or when using ducting to navigate hot
air out of the system.
Earth terminal marking
To comply with the requirements of UL60950-1, EN60950-1, IEC60950-1, CSA22.2 no. 60950-1, UL60601-1, EN60601-1,
EN61010-1, IEC60601-1, IEC61010-1, CSA22.2 no 601-1 where the incoming wiring earth is intended for connection as the
main protective earthing conductor and where the terminals for such a connection is not supplied on a component or
subassembly such as a terminal block, the user shall add an appropriate label displaying a protective earth symbol in
accordance with 60417-2-IEC-5019 directly adjacent to the terminal. The label should be durable and legible and should
withstand the 15s rub test as per UL60950-1 section 1.7.15.
Mounting
The unit can be mounted using the bottom or side mounting points. Each mounting point accepts an M4 screw where the
maximum penetration, inclusive of 1.75 mm chassis thickness, should never exceed 4.00 mm. The maximum torque for the
M4 screws is 1.50 Nm.
Other





To prolong the life of the unit, use in a dust free environment.
If units are damaged during transit, contact your sales agent or Vox Power and DO NOT apply power to the unit.
Always use adequately sized cables and ensure good crimp connections.
Use cable supports to minimise stress on connectors.
Avoid excessive shock or vibration.
General installation parameters

Equipment class
I

Installation category
II

Pollution degree
2

Material group
IIIb (Indoor use only)

Flammability rating
94V-2

IP rating
IP10

RoHS compliance
2002/95/EC
6
Th
heory of operatio
on
The
e diagram belo
ow outlines th
he topology an
nd major interrnal componen
nts of a fully assembled
a
sys
stem. Four ou
utput slots are
e
provided and can
n be populated
d by any combination of ou
utput modules
s. The remaining componen
nts in the block diagram are
e
used in the inp
put module.
hou
The
e input module
e is responsible for receivin
ng the AC mains line voltage and convertting it to an appropriate DC
C voltage whils
st
providing protecttion from AC line disturbanc
ces and preve
enting excessive EMI emissions and curre
ent harmonics
s. The integrated
EMII filter attenua
ates high frequency currentt emissions to
o levels below EN55022 clas
ss B. It also provides
p
single
e pole fusing in
the live conducto
or and protecttion from line disturbances as outlined in EN61000.
ush current is controlled by
y a resistive ellement upon initial
i
connecttion to the AC line. Once the internal cap
pacitances hav
ve
Inru
bee
en charged, th
he resistive ele
ement is bypa
assed to reduc
ce losses.
Active Power Fac
ctor Correction
n (PFC) is used to ensure an accurate inp
put current wa
aveform with extremely low
w harmonic
con
ntent, exceeding the require
ements of EN6
61000. This sttage also prov
vides active in
nput current limiting which prevents
ove
erloading of th
he input stage while mainta
aining high pow
wer factor.
The
e output of the
e PFC stage ch
harges the ho
old-up electrolytic capacitorrs which store enough energ
gy to allow the system to
con
ntinue operatin
ng during min
nor line disturb
bances. These
e are the only electrolytic ca
apacitors in th
he entire powe
er supply and to
furtther increase system reliability, long life and high temperature capa
acitors are use
ed.
A highly efficientt zero voltage switching circ
cuit is used to
o drive the me
edically isolate
ed transformer from the hold-up capacito
ors.
The
e output modu
ules connect to the transforrmer secondarry and provide
e safe isolated
d power to a high
h
performa
ance synchron
nous
recttifier power co
onverter which is controlled
d using the lattest analog co
ontrol technolo
ogy to produce superior outtput performa
ance
in an
a extremely rreduced size.
7
In
nput mod
dule operation
Sta
artup & shut down
The
e NEVO+ input modules ope
erate from a universal
u
input voltage rang
ge and start automatically
a
upon application of adequa
ate
AC mains voltage
e (>84Vrms). After a short delay, the glo
obal 5V bias supply
s
starts and
a
the ACOK
K signal goes high to indica
ate
that the mains vo
oltage is present and input stage is operrating correctly. Once the ACOK
A
signal is high, the outtput modules turn
on and
a
deliver po
ower to the ap
pplication load
ds. The powerr good signals will indicate that
t
the outpu
ut voltages arre within
spe
ecification. The
e diagram below shows the
e normal start up/shut down
n sequence an
nd gives typic
cal timings.
Typ
pical timing va
alues:
t1
 300 ms, t2  50 ms, t3 
25 ms, t4
 15 ms, t5 = 5 ms
m (minimum
m), t6  100 ms
m
ains voltage is removed, the
e internal hold
d-up capacitorrs will supply power to the load for typica
ally 20 ms (t4+t5)
When the AC ma
m
pow
wer. The ACOK
K signal will go low at least 5ms before tthe output voltages fall belo
ow the power good thresho
old
at maximum
leve
el. This allows
s the application to prepare
e for the impen
nding loss of power.
p
The 5V
V bias supply will remain on
n for typically
100
0ms, after the
e output modu
ules have turned off.
Holld-up
For short line dis
stubances (<2
20ms), the outtput voltages will not be afffected*. Howe
ever, the ACO
OK signal may still go low to
o
warrn that there iis an impendin
ng loss of output power. Th
he ACOK signa
al will return to
t the high sta
ate once the unit
u
has
reco
overed from the
t
disturbanc
ce.
*Ou
utputs that arre adjusted ab
bove the hold--up voltage as
s detailed in th
heir respective
e datasheets, may experien
nce a dip in
volttage but neve
er below the hold-up voltage specified.
Idle
e power
The
e idle power of the NEVO+ PSU is extrem
mely low when
n compared to
o similar powe
er supplies.
With the output m
modules enab
bled the unit typically only requires
r
28 W with no outp
put load. To re
educe the idle power further
the outputs can b
be disabled us
sing the globa
al inhibit (GINH) pin. With the
t
outputs disabled the un
nit typically req
quires less tha
an
21 W.
Ove
er temperatu
ure Protectio
on (OTP)
The
e input module
e is protected from excessiv
ve temperatures by means
s of various intternal sensors
s. If temperature threshold
ds
are exceeded the
e entire unit may
m
latch off, with no ACOK
K warning. To re-enable the
e unit the AC mains must be disconnecte
ed
for approximately
y 2 minutes.
8
Power derating
NEVO+600 units must always be operated within its stated operating limits. Equipment manufacturers and other users must
take appropriate deratings into account at all times when specifying a unit for the intended application. If in doubt contact
your sales representative or Vox Power for assistance.
There are two main deratings for NEVO+ power supplies, temperature and input line voltage. Temperature deratings apply to
both input and output modules, while line deratings apply only to the input module.
For temperature, the derating for both input and output modules is 2.5% (of maximum rated power) per degree Celsius above
50°C. While, for input line voltage, the derating for the input module only is 0.7143% (of maximum rated power) per volt
below 120Vrms. These deratings can be calculated using the following conditional equations;
Line Derating
Equation for line derating:
650
600
Pout
= Prated*Line derating factor
= Prated*(1-(0.007143*(120-Vin))
Otherwise,
Pout
= Prated
550
Output Power (Watts)
If Vin < 120,
500
450
Derate at 4.28W per volt below 120V
400
350
300
250
80
100
120
140
160
180
200
220
240
260
Input Voltage (Vrms)
Temperature derating
Equation for temp derating:
If temp > 50C,
Pout
= Prated*Temp derating factor
= Prated*(1-(Temp-50)*0.025)
Otherwise,
Pout
= Prated
Normalised Derating factor
1.1
1
0.9
0.8
Derate at 2.5% per volt above 50˚C
0.7
0.6
0.5
0.4
‐30
‐10
10
30
50
70
Temperature
Depending on the application conditions, one or both of the deratings may apply. Where both apply, the derating factors given
above can be multiplied together to obtain the total derating factor.
Example:
What are the NEVO+600 input and output module deratings at 60°C at 100V line?
Input power rating
=
Output power rating
=
Line derating factor
=
Temperature derating factor =
Input power rating
=
Output 2 power rating
=
Prated*line derating factor*Temp derating factor
Prated*Temp derating factor
(1-(0.007143*(120-Vin)) =
(1-(0.007143*(120-100)) =
(1-(Temp-50)*0.025)
=
(1-(60-50)*0.025)
=
600*0.85714*0.75
=
385.7W
150*0.75
=
112.5W
0.85714
0.75
9
Efficiency
The efficiency of the overall unit is dependent on several parameters such as input voltage, load level and on the combination
of output modules. The plots below show typical efficiencies of a NEVO+600 over the full load and line voltage range and fitted
with four of each type of output module, equally loaded.
Typical Line Efficiency (Maximum power)
0.90
575
0.88
Typical Line Efficiency (Derated Power)
0.90
600
600
575
0.88
550
550
0.86
525
0.84
500
475
0.82
450
0.80
OP1
OP4
0.78
80
100
120
140
160
OP2
Pout
180
200
Efficiency
Efficiency
0.86
240
475
0.82
450
OP1
OP4
0.78
400
220
500
0.80
425
OP3
525
0.84
80
260
100
120
Efficiency
Efficiency
Typical Load Efficiency (120Vrms)
OP1
OP3
0
50
100
150
200
250
300
350
OP2
OP4
400
160
180
200
220
425
OP3
400
240
260
Input voltage (Vrms)
Input Voltage (Vrms)
0.90
0.88
0.86
0.84
0.82
0.80
0.78
0.76
0.74
0.72
0.70
0.68
0.66
140
OP2
Pout
450
500
550
Typical Load Efficiency (220Vrms)
0.90
0.88
0.86
0.84
0.82
0.80
0.78
0.76
0.74
0.72
0.70
0.68
0.66
600
OP1
OP3
0
Output Power (Watts)
50
100
150
200
250
300
OP2
OP4
350
400
450
500
550
600
Output Power (Watts)
An estimate of the efficiency for any particular system may be obtained from these graphs using the procedure outlined in the
example below.
Example:
Estimate the efficiency of an NEVO+600-1123, at 160Vrms input and 100W load on each output?
1. Define load efficiencies for each output module at the specified load and 220V.
2. Define change in efficiency from 220Vrms to 160Vrms for each output module.
3. Sum the values from step one and two for each output module.
4. Calculate the average efficiency for the total system.
Step
Details
1
2
3
4
Є220 (Load chart)
∆Є(220-160) (Line chart)
Єx = Є220 + ∆Є(220-160)
ЄAVE = (Є1 + Є2 + Є3 + Є4)/4
Slot A
OP1
0.84
-0.01
0.83
Slot B
OP1
0.84
-0.01
0.83
Slot C
OP2
0.87
-0.01
0.86
0.845
Slot D
OP3
0.87
-0.01
0.86
1
10
Sig
gnalling
To reduce cabling
g in the end system,
s
all ma
ajor input and output signals and the global 5V bias su
upply are wire
ed to a single
sign
nals circuit tha
at is accessed
d through the connector (J2
2) located at the output side
e of the chass
sis as shown in
n the diagram
m
belo
ow.
Pin
1
2
3
4
5
6
7
8
9
10
11
Name
N
P
PG1
I
INH1
P
PG2
I
INH2
P
PG3
I
INH3
P
PG4
I
INH4
G
GINH
A
ACOK
+
+5V
Description
Po
ower Good
In
nhibit
Po
ower Good
In
nhibit
Po
ower Good
In
nhibit
Po
ower Good
In
nhibit
Global inhibit
AC
C mains signa
al
Global 5V Bias
12
C
COM
Co
ommon
Slot A
Slot B
Slot C
Slot D
All of
o the signals are reference
ed to the bias supply comm
mon rail (COM)) and external control and/or monitoring circuits can be
b
eas
sily powered a
and interfaced to the PSU th
hrough this co
onnector. The entire signals
s circuit is fully
y medically isolated and can
be considered
c
a SELV
S
output. The table belo
ow lists the is
solation voltag
ges.
Signals
s to Input
Signals
s to Chassis
Signals
s to Output
Signals isolation vo
oltages
4000
250
250
Vac
V
V
Vdc
V
Vdc
5V bias supply (Power)
A 5V bias supply that can deliv
ver up to 200mA is provide
ed as standard
d on all units. This supply is
s available wh
henever the AC
C
mains voltage is connected an
nd the input module
m
is operrating correctly
y. To ensure safety,
s
the folllowing abnorm
mal conditions
s
may
y cause the entire unit to la
atch off, which
h will disable the 5V bias su
upply:



Over tem
mperature of any part of th
he unit
Over vo
oltage on the output
o
Internall over current (device failurre)
AC mains signa
al (ACOK [Ou
utput])
An ACOK signal is provided to indicate to th
he user that th
he AC mains v
voltage is applied and the in
nput module iis operating
correctly. The ou
utput signal is driven from an
a internal operational amp
plifier as show
wn in the follow
wing diagram.. Under norma
al
ope
erating conditiions this signa
al gives a warning of 5ms before
b
the output voltage fa
alls below the power good threshold.
t
How
wever, to ensu
ure safety, the
e following ab
bnormal conditions may cau
use the entire unit to latch off without an
n ACOK warnin
ng:



Over tem
mperature of any part of th
he unit
Over vo
oltage on the output
o
Internall over current (device failurre)
1
11
Pow
wer Good sig
gnals (PG1-P
PG4 [Output])
Eac
ch output mod
dule provides a power good (PG) signal to
e output volta
indiicate when the
age is above approximately
a
y 90%
of the
t
preset volttage for that module.
m
Each PG signal on an
output module is
s internally connected throu
ugh an opto-is
solator
to the
t
signals circuit, which bu
uffers the sign
nal through a PNP
tran
nsistor with a 10k pull down
n resistor, as shown.
The
e LED on the ffront of each module
m
gives a visual
con
nfirmation of the PG status.
Notte that remote
e adjustments
s of the outputt voltage using the
Vco
ontrol and Icon
ntrol pins do not
n change the PG signal
thre
eshold. The PG
G threshold is
s always appro
oximately 90%
% of
the voltage set w
with the manual potentiome
eter.
Outtput Inhibits
s (INH1-INH4, GINH [Input])
The
e signals circuit provides fou
ur inhibit inpu
uts to disable each
e
output m
module individ
dually and a fifth global inhiibit input (GIN
NH)
to inhibit all mod
dules simultan
neously. Each inhibit input is internally co
onnected through an opto-isolator to the
e respective
output modules. The basic inte
ernal electrica
al circuit and timing
t
diagram
ms are shown below. Typica
ally, tOFF = 100 μs and
tON = 8 ms.
To inhibit each output module individually, GINH should be connected to COM, and 5V applied to
o the appropria
ate input
INH
H1/2/3/4. To s
start with all outputs
o
inhibitted and then enable
e
them individually, GINH
G
should be connected to
t +5V, then pull
p
dow
wn the approp
priate input IN
NH1/2/3/4. If GINH
G
is left unconnected, then
t
INH1/2/3
3/4 will all beh
have as global inhibit inputs.
i.e. 5V on any IN
NH input will disable all outp
puts.
1
12
Single Outtput mod
dule ope
eration
Pow
wer profile
The
e power profile
e diagram below is a voltag
ge/current plot that togethe
er with the ass
sociated table
e provides dettails of the ma
ain
feattures of the cu
urrently availa
able output modules.
m
Param
meter
VNOM (V)
VMIN (V)
VMAX (V)
VOVP (V)
IRATED (A)
IOCP (A)
(
VHICCUPP (V)
IHICCUPP (A)
PRATED (W)
PPEAK (W)
OP1
1
5
1.5
7.5
9.5
25
27.5
5
1
22
125
187.5
5
OP2
12
4.5
15
17
15
16.5
2
13.2
150
225
OP3
24
9
30
32
7.5
8.25
4
6.6
150
225
OP
P4
4
48
1
18
5
58
6
62
3.75
4.1
125
4
3.3
15
50
217.5
Outtput voltage adjustmentt
Eac
ch output can be adjusted within
w
the rang
ge as describe
ed in the table
e above or in the datasheett. Voltage adjustment can be
b
ach
hieved by two methods;
1. Manuall potentiome
eter adjustment
Usin
ng the manua
al adjust poten
ntiometer, the
e preset outpu
ut voltage (VSEET) of each output module is adjustable over
o
the entire
e
range of VMIN to VMAX as specifiied in the pow
wer profile table above. A cllockwise rotattion of the pottentiometer re
esults in an
e of the output voltage.
incrrease of the output voltage while an antii-clockwise rottation results in a decrease
2. Remote
e voltage pro
ogramming
Usin
ng remote voltage program
mming, the output voltage may
m
be adjustted beyond th
he VMIN and VMAX range specified in the po
ower
profile table abov
ve. However,, certain preca
autions must be
b taken to en
nsure correct operation. Ple
ease see the “Advanced
“
outtput
mod
dule features”” section for more
m
details.
Ove
er Voltage Protection (O
OVP)
In the
t
event of a
an output mod
dule fault, the modules are protected aga
ainst excessive output volta
ages. This is im
mplemented as
a a
fixe
ed voltage thre
eshold (VOVP, in the table ab
bove) and if the output volttage exceeds this threshold
d the entire ch
hassis will be
latc
ched off. To re
esume operatiion of the unitt, disconnect the
t
AC input voltage
v
for 2 minutes,
m
remo
ove the faulty
y output modu
ule
and
d reconnect th
he AC input vo
oltage.
Notte that no warrning is given on the AC_OK
K signal for fa
aults of this type.
Ove
er Current & Short Circuit Protection
n (OCP & SCP
P)
For increased saffety and reliab
bility all outpu
ut modules in the NEVO serries have overr current and short
s
circuit protection.
p
The
e
er current thre
eshold is typic
cally set at 110
0% of the rated current and has a constant current, straight
s
line ch
haracteristic that
ove
reduces the outp
put voltage as the load resis
stance decreases. If the output voltages falls below th
he hiccup volta
age threshold
(VHICCUP) the mod
dule enters sh
hort circuit pro
otection mode
e. In this mode the output module uses a hiccup scheme to reduce
system losses an
nd potential da
amage. When in this mode,, the output will
w be enabled
d for approxim
mately 3% of the
t
time,
disa
abled for 97%
% and will attempt to restartt at approximately 125 ms intervals. The
e module remains in this sttate until the
sho
ort circuit cond
dition is remov
ved, at which point the module returns to
t normal ope
eration.
1
13
Rev
verse Curren
nt Protection
n (RCP)
The
e standard outtput modules use synchronous rectification in the outp
put stages to achieve high efficiency and
d as a result th
he
outputs can both
h source and sink
s
current. The
T
sink curre
ent is internally limited to approximately -6% of the maximum
m
rated
d
current. However, in applicatio
ons where the
e output modu
ules are conne
ected to exterrnal power sou
urces such as batteries or
plies certain precautions
p
must be observ
ved to preventt damage to th
he unit.
other power supp
ould never be directly conne
ected to to external power sources witho
out some form
m of reverse cu
urrent protecttion
The outputs sho
c
mos
sfet. If protecttion is not use
ed, large reverse currents which
w
will ultim
mately result in
such as an external diode or controlled
mage to the unit will occur, especially wh
hen the AC ma
ains is disconn
nected.
dam
Outtput module Average and Peak powe
er
All modules have
e an average and
a
peak pow
wer rating. The
e average pow
wer of each un
nit must at all times remain
n below it’s
spe
ecified limit. However, each output can deliver up to 150% of it’s av
verage power rating for a maximum
m
of 5 seconds at 50%
duty cycle, subje
ect to the currrent limit not b
being exceede
ed and subject to the overa
all average power drawn be
eing less than the
spe
ecified average
e power rating
g (including any input deratting due to temperature or line voltage).. The available
e peak power is a
function of the output voltage and maximum
m current for each module.. Full peak pow
wer is only po
ossible when the
t
output
ed to VMAX and
d the maximum current is drawn
d
from th
he module. No
ote that both average
a
and peak
p
power
volttage is adjuste
ratings are subje
ect to the sam
me temperature derating as the input module (derate by
b 2.5% per °C
° above 50°C
C), but are no
ot
sub
bject to any lin
ne derating.
Sta
art up & Shutt down
All outputs
o
are designed to have a regulated monotonic start-up
s
with a
rise
e time of approximately 3 ms
m as shown in the diagram
m right. The po
ower
goo
od signal stays
s low until the
e voltage exce
eeds the powe
er good thresh
hold
(≈9
90%).
Where multiple o
output module
es are used, th
he default start up scheme is
ratio-metric with all outputs sttarting at the same time as
s shown in the
e
diag
gram right. Ex
xternal contro
ol circuits may
y be used to im
mplement
trac
cking or seque
enced start up
p if necessary.
e outputs are not designed to start into a pre-biased lo
oad and may
The
disc
charge any ex
xternally capac
citance before
e beginning to
o ramp the output
volttage up in the
e normal way.
At shutdown
s
the outputs enterr a high imped
dance state. Where
W
no exte
ernal
load
d is present itt may take som
me time for th
he voltage to decay. When
driv
ving inductive loads, care must
m
be taken to limit the voltage
v
at the
output terminals so as to prev
vent damage to
t the unit.
nchronisation
Syn
All output
o
modules in the same chassis are synchronised. The typical operating
o
freq
quency is 260kHz and parallleled/seriesed
d
unitts will not pro
oduce beat frequencies.
1
14
Rip
pple and Nois
se
The
e ripple and no
oise figures sttated in the da
atasheet are defined
d
based on a standarrd measuring method. To obtain the sam
me
resu
ults the same test setup must be used and care must be taken to e
eliminate any parasitic noise pickup. The
e diagram belo
ow
sho
ows details of the setup and
d also sources
s of noise pickup.
Ove
er Temperatture Protectio
on (OTP)
Eac
ch output mod
dule is protectted against ex
xcessive tempe
eratures. In th
he event of th
he internal tem
mperatures ex
xceeding safe
leve
els the entire unit may be latched off. To
o resume operration of the unit,
u
disconnect the AC inpu
ut voltage for 2 minutes,
ens
sure external a
ambient temp
peratures are within
w
specific
cations and th
hen reconnect the AC input voltage. Note
e that no warn
ning
is given
g
on the AC_OK
A
signal for
f faults of th
his type.
Tra
ansient respo
onse
The
e NEVO outputt modules hav
ve been espec
cially designed
d to have high
h reliability an
nd to achieve this
t
all electro
olytic capacito
ors
hav
ve been elimin
nated from the
e design. Due to this, high dynamic load transients ca
an cause relatiively high volttage deviation
ns at
the output and although the outputs have a very high loo
op bandwidth with typical recovery
r
times
s of less than 100μs, the
ns may still be
e excessive for some applications.
volttage deviation
An example application is deta
ailed in the dia
agram below and shows typ
pical response
es at the term
minals of the output module
and
d at the load. Notice that th
he voltage dev
viation due to cable inducta
ance exceeds the
t
module re
esponse and h
hence a capacitor
loca
ated at the mo
odule termina
als will have litttle effect at the
t
load. The optimum
o
solu
ution is to loca
ate a low impe
edance
elec
ctrolytic capac
citor at the loa
ad which will eliminate
e
the inductive cab
ble drop and also reduce the
e typical volta
age deviation at
a
the module.
1
15
Ad
dvanced Single Output
O
m
module
fe
eatures
mote voltage
e programming (Externa
al voltage control)
Rem
The
e output voltag
ge of the mod
dule can be ad
djusted using an external voltage source connected be
etween the CO
OM and Vcontrol
pins
s on the signa
als connector J5
J as shown below.
b
In this
t
configurattion the outpu
ut voltage will follow the typ
pical equation
n below,
Vo = Vset((1.8-V
Vctrl) / 0.6), where
w
Vset is the manual preset voltage of the module
e.
The
e output voltag
ge can be con
ntrolled from 0%
0 to 300% of
o the preset voltage
v
using this control method.
m
Howe
ever, care mus
st
be taken
t
to ensu
ure the output voltage does not exceeed the OVP levell, as this is considered a safety hazzard and
a
will latch the
entire unit off. To
o determine the level of con
ntrol voltage that
t
will trigge
er OVP, insertt Vovp into the equation ab
bove.
Exa
ample:
V, Vset = 5V;
Vovp = 9.5V
=> Vctrl = 1.8-(Vovp*0.6
1
6/Vset) = 0.66
6V
Hen
nce, Vctrl shou
uld never fall below 0.66V, otherwise OV
VP may latch the
t
entire unitt off.
Alte
ernatively, by manually adjusting the outtput voltage to
t less than 1//3rd of the OVP voltage ensures that OVP
P can never be
e
trip
pped by remotte voltage con
ntrol.
Also
o, remote adjustment of the output volta
age using the Vcontrol pin does
d
not affec
ct the preset power
p
good th
hreshold. Hence,
rem
motely adjustin
ng the output voltage below
w 0.9*Vset wiill cause the power
p
good sig
gnal to go low
w.
Where tight volta
age adjustmen
nt tolerances are required, it is recomme
ended to use external
e
circuitry to provide
e closed loop
con
ntrol of the Vco
ontrol pin.
1
16
Rem
mote currentt programmiing (Externa
al voltage con
ntrol)
The
e output curre
ent limit of the
e module can be reduced us
sing an extern
nal voltage source connecte
ed between th
he COM and
Icon
ntrol pins on tthe signals connector as sh
hown below. In
n practice this
s also means that
t
the outpu
ut can be used
d as a modula
ated
or constant
c
curre
ent source.
In the
t
diagram a
above, Vi_out is an internal voltage sourc
ce that is prop
portional to th
he internal inductor current and
app
proximates the
e equation,
Vi_o
25)), where Irrated is the maximum rated
d current for the
t
module.
out = 0.6 + (Iout
o /(Irated*1.2
In this
t
configurattion the outpu
ut current limit will approxim
mate the follo
owing equation
n,
Ilimit = (Vctrl-0.6
6)*Irated*1.25, where Irated is the maxim
mum rated current for the module.
m
It is
s not possible to increase th
he maximum current limit of
o the module
e, and control voltages (Vctrrl) exceeding 1.53 V will have
no effect
e
on the c
current limit.
When using an o
output module
e as a modulatted current so
ource, the output voltage sh
hould be manually adjusted
d to the
max
ximum that w
will be required
d by the application and thiis will be the upper
u
voltage
e limit. Once th
he load is con
nnected, the
output current ca
an then be mo
odulated by applying a conttrol voltage as
s described ab
bove.
Notte that the pow
wer-good thre
eshold level is
s fixed and deffined by the manually
m
preset voltage. He
ence, while the output mod
dule
is limiting or mod
dulating the output
o
current the PG signal may go low.
Where tight curre
ent adjustmen
nt tolerances are required, it is recomme
ended to use external
e
circuitry to provide
e closed loop
con
ntrol of the Ico
ontrol pin.
Outtput current measureme
ent
The
e output curre
ent of the mod
dule can be measured using
g the Icontrol signal. If this pin
p is unloaded its output voltage will follow
the equation,
25)), where Irated
is the ma
aximum rated current for th
he module.
Vi_o
out = 0.6 + (Iout
o /(Irated*1.2
r
Notte that the Icontrol output vo
oltage is repre
esentative of the
t
internal in
nductor curren
nt not the actu
ual load current. However,
this
s will only hav
ve an influence
e during dynamic events. Itt is recommen
nded to add an external am
mplifier (as sho
own above lefft)
1
17
en using the Icontrol signal to
t measure th
he output currrent as loading
g the Icontrol signal,
s
even with
w
microamps can cause th
he
whe
current limit to b
be reduced. If it is required to measure the output current and adjust the output current limit simultaneously,
s can be achie
eved by using a clamp circuit instead of a voltage sourrce to adjust the
t
current lim
mit, while conttinuing to use an
this
amplifier to meas
sure the output current. An
n example circ
cuit is shown above
a
right. In this case Vctrl
c will control the current limit
ed Icontrol sign
nal will provide a measurem
ment of the ou
utput current.
while the amplifie
Rem
mote sensing
g
Rem
mote sensing is available on
n all output modules
m
and ca
an be used to compensate for any voltag
ge drop in the main power
lead
ds between th
he power supp
ply and the loa
ad. To implem
ment remote sensing
s
connect the positive
e sense pin (S
S+, connector
J5.2
2) to the posittive side of the remote load
d and the negative sense pin (S-, connec
ctor J5.1) to the negative side of the rem
mote
load
d. The voltage
e will be regulated at the po
oints where th
he sense cable
es are connec
cted.
n against worn
n out power ca
ables or accidental power cable
c
removal is provided and prevents damage
d
to the
e
Active protection
e. An internal circuit measures the voltag
ge between S+
+ to V+ and SS to V-, when
n this voltage exceeds the
unitt in each case
thre
esholds speciffied in the dattasheet, the output voltage is reduced to
o benign levels
s. During systtem design, ca
are must be
take
en to ensure p
power cables have a sufficiently low volttage drop at maximum
m
load
d current to en
nsure this pro
otection does not
n
actiivate unintenttionally.
In systems
s
where remote sens
sing is not use
ed, the outputt voltage at th
he power term
minals will be slightly
s
higherr than that at the
sen
nse terminals. This voltage difference is termed,
t
open sense offset and
a
occurs du
ue to internal bias
b
currents in the sensing
g
circ
cuit. Factory set units are se
et with the se
ense cables co
onnected unles
ss otherwise specified.
s
Loc
cal Bias supp
ply
A lo
ocal non-isolatted +5 V bias supply is provided on each
h output modu
ule (+5 V on J5.6,
J
referenc
ced to COM on
n J5.5). This
sup
pply is intende
ed to power interface circuitts for monitorring and contrrolling the output modules, such as amplifying the current
output signal as described earrlier. The outp
put can supply
y up to 10mA maximum, an
nd exceeding this
t
can dama
age the unit.
Also
o, as COM is c
connected to an
a internal vo
oltage that is NOT
N
equivalent to S- or V-, particular atttention must be given to
grounding issues
s when interfacing COM to any
a
control cirrcuit in the ap
pplication. Con
nnecting COM to S- or V- may
m
result in
mage to the unit.
dam
1
18
Se
eries Con
nnected outputs
NEV
VO output mo
odules of the same
s
type can
n be seriesed in any numbe
er to achieve higher
h
output voltages, eve
en across multtiple
cha
assis! The follo
owing instructtions must be followed for output
o
module
es configured in this manne
er.
WARNING!
Energy and
a voltage hazards
h
may
y arise when individual modules are seriesed.
s
See the Safety section forr more detailss.
WARNING!
When modules are seriesed, their inhibit lines (J2), if used,, should be paralleled.
p
Inhibiting se
eriesed modu
ules individua
ally may cau
use damage
Iso
olation to gro
ound
Carre must be tak
ken not to exc
ceed the outpu
ut module isolation to chas
ssis ground wh
hen seriesing outputs. Each
h output is ratted
for 250 volts max
ximum between each outpu
ut terminal an
nd chassis gro
ound. Exceedin
ng this voltage may damag
ge the unit.
Rem
mote sensing
g
For seriesed mod
dules, remote sensing is achieved by con
nnecting the upper
u
most po
ositive sense terminal (S+) and the lower
mos
st negative se
ense terminal (S-) from the
e series of modules to their respective loa
ad regulation points. All inn
ner sense
term
minals in the s
series must be daisy chaine
ed, S+ to S- from
f
the first module in the
e series to the
e last module in the series. An
exa
ample of two s
seriesed modu
ules is shown below.
Ser
riesed remotte voltage/cu
urrent control
Rem
mote voltage a
and/or curren
nt control is po
ossible with se
eries connecte
ed output mod
dules using th
he advanced V-control
V
and
I-co
ontrol function
ns as describe
ed earlier. How
wever, individual control of each module can be complex as the varrious control
term
minals are refferenced to the positive outtput of the pre
eceding module and require
e the use of multiple
m
isolate
ed control
volttages to attain
n control overr the full voltage range. In practice,
p
indiv
vidual control of each modu
ule is rarely re
equired and a
more straightforw
ward method is to control all
a outputs sim
multaneously w
with a single control
c
voltage. With NEVO output modu
ules
this
s is achieved w
with the use of
o the Nevo Se
eries Tracker Interface,
I
the datasheet for this interface is available from the Vox
Pow
wer website i.e
e. www.vox-p
power.com. By
y using the se
eries tracker in
nterface all mo
odules in a se
eries can be co
ontrolled by a
sing
gle control voltage that can
n be reference
ed to the COM (J5.5) pin on
n any module.
SEL
LV precautio
ons
Where series com
mbinations of output modulles exceed 60 V, the outputt can no longe
er be considerred SELV (Saffety Extra Low
w
nce the final equipment
e
manufacturer mu
ust provide su
uitable protecttion for both users
u
and serv
vice personne
el.
Volttage) and hen
1
19
Pa
aralleled outputs
s
NEV
VO single type
e output modu
ules of the sam
me type can be
b paralleled in any number within the sa
ame chassis to
t achieve higher
output currents.
WARNING!
Energy hazarrds may arise when individu
ual modules are
a paralleled.
See the Safetty section for more details.
WARNING!
When mod
dules are para
alleled, their inhibit lines (J2), if used, sh
hould also be paralleled.
Inhibiting paralleled mo
odules individu
ually may cause damage
o each paralleled module should
s
be adju
usted as close
e as possible.
For best performance, the outtput voltages of
dure below to
o achieve the most
m
accurate
e results:
Follow the proced
1.
2.
3.
Connect all the
t
negative power
p
cables together.
t
Adjust the first module (A
A) to the desirred voltage.
Connect a vo
oltmeter betw
ween the posittive terminal of
o the first mo
odule (A) and the positive te
erminal of the
e
second module (B) and ad
djust the seco
ond module (B
B) until the vo
oltage is within
n +/-0.2%..
maining modules, always using the positiv
ve terminal off the first mod
dule (A) as the
e
Repeat step 3 for the rem
4.
reference.
c
operate in
n two distinct modes, Norm
mal parallel mo
ode or Share parallel
p
mode.
When paralleled,, the outputs can
rmal parallel mode
Nor
For normal parallel mode, the positive powe
er cables shou
uld be connectted together and
a
the negattive power cab
bles should be
e
con
nnected togeth
her. No other connections are
a required as shown in the diagram below.
In this
t
mode the highest adjus
sted output module
m
will sup
pply all of the load current until it’s curre
ent limit is rea
ached. If the lo
oad
dem
mand exceeds
s this level the
e output voltag
ge will drop to
o the level of the next highest adjusted module
m
and th
hat module wiill
beg
gin to supply tthe load current while the first module co
ontinues deliv
vering full currrent. This proc
cess repeats ffor the total
num
mber of paralleled modules. The diagram
m above shows
s the VI curve
e for such a sy
ystem.
2
20
Outtput modules that are not delivering
d
currrent will typica
ally sink a small amount of current from the other outtputs, but this
s
will not exceed -6% of each modules
m
maxim
mum rated current.
Typ
pically, system
m reliability is reduced in this mode as the higher adjusted modules will do most of the work with
w
the lower
adjusted modules only deliverring current du
uring peak loa
ad demand.
Sha
are parallel mode
m
In Share paralle
el mode, the outputs
o
are pa
aralleled as be
efore and the Icontrol
I
pin fo
or each modulle is connected together as
own in the diag
gram below.
sho
Con
nnecting the Icontrol pins to
ogether forces
s all the outpu
uts to deliver the same currrent, ensuring
g that the systtem reliability
y is
max
ximised and the work load is distributed evenly across
s all paralleled
d modules.
In this
t
mode the lowest adjustted output mo
odule will dete
ermine the acttual output vo
oltage and all higher adjustted outputs wiill
reduce their volta
age. There ma
ay be a small amount of cirrculating curre
ent between the
t
modules, approximately
a
y 6% of the
max
ximum rated current for ea
ach module.
The
e current outp
put signal (Icontrol) can still be used to measure
m
the output
o
currentt but it must be
b scaled by N,
N where N is the
t
num
mber of paralleled modules.
WARNING!
Care
C
must be
e taken to avo
oid differential voltages between
b
the negative pow
wer output te
erminals of th
he
paralleled
p
mo
odules as thiss can cause errors at the
e control pinss. To avoid th
his, it is recom
mmended that a low
im
mpedance co
onnection be
e made betwe
een the nega
ative power terminals
t
clo
ose to the PS
SU output and cables
th
hen connecte
ed from this common point to the load
d.
Par
ralleling acro
oss multiple chassis
Paralleling across
s multiple cha
assis is not possible withoutt external prottection (such as external diodes or contrrolled MOSFET
Ts)
to prevent
p
circula
ating currents
s between eac
ch chassis. Faiilure to provid
de such protec
ction may resu
ult in damage
e to the units.
Con
nsult Vox Power for details on how best to
t implement such applications.
Where units are paralleled acrross multiple chassis,
c
the ou
utputs in each
h chassis will not be synchrronised and th
he peak to pea
ak
s
output ripple may contain beat frequencies in the audio spectrum.
2
21
Par
rallel remote
e sensing
Rem
mote sensing can be used as
a normal with
h paralleled modules.
m
The sense
s
lines (S+ and S-) from each of the
e output modu
ules
sho
ould be connec
cted together,, S+ to S+, an
nd S- to S- as
s shown below
w. This should be done close
e to the powe
er supply outp
put
and
d a single pair of cables bro
ought from the
ese sense line
es to the load. Keeping cable lengths to a minimum an
nd using twiste
ed
pairrs where nece
essary will help reduce noise pickup in th
he sense lines.
N+1 configurattions
onfigurations, a suitably ratted diode (or controlled MO
OSFET) must be
b used on each output to
When using N+1 redundant co
c
a systtem failure. However, the d
diode introduc
ces voltage drops between the
t
supply and
prevent a device failure from causing
nificantly degrrade the load regulation. To
o counteract this,
t
the remo
ote sense lines
s can be used to regulate th
he
the load that sign
ad as shown below.
b
volttage at the loa
Typ
pically, this configuration ca
an damage the
e internal sense resistors used within a power
p
supply. However, the
e NEVO outpu
uts
hav
ve integrated protection to prevent this type
t
of damag
ge and are com
mpletely N+1 compatible without
w
any ad
dditional exterrnal
protection circuittry. Note that only the posittive sense terrminal is prote
ected and diod
des should be used in the positive
p
nnection only.
con
2
22
Par
ralleled remo
ote voltage/
/current adju
ust
The
e simplest way
y to achieve re
emote voltage
e/current prog
gramming witth paralleled outputs
o
is to operate
o
the mo
odules in sharre
parallel mode. Fo
ollow the proc
cedure outlined earlier to co
onfigure the outputs in sharre parallel mo
ode and once configured
c
in this
mod
de, all the Vco
ontrol and CO
OM pins can be
e connected to
ogether. Remo
ote voltage/cu
urrent program
mming can th
hen be perform
med
exa
actly as with a stand-alone module.
It is
s not recommended to use remote voltag
ge/current pro
ogramming in
n normal paralllel mode.
WARNING!
Care
C
must be
e taken to avvoid differenttial voltages between the negative po
ower output te
erminals of the
paralleled
p
mo
odules as thiis can cause
e errors at the
e control pinss. To avoid this, it is reco
ommended th
hat a low
impedance cconnection be
e made betw
ween the neg
gative power terminals clo
ose to the PS
SU output an
nd cables
then
t
connectted from this common po
oint to the loa
ad.
2
23
Du
ual Output modu
ule opera
ation
Pow
wer profile
The
e power profile
e diagram below is a voltag
ge/current plot that togethe
er with the ass
sociated table
e provides dettails of the ma
ain
feattures of the cu
urrently availa
able dual outp
put modules.
Parameter
C
Channel
VNOM (V)
VMIN (V)
VMAX (V)
VOVP (V)
IRATED
(A)
R
IOCP (A)
PRATED
(W)
R
Top
12
5
15
20
5
5.25
75
OP5
Botto
om
12
2
5
15
5
20
0
5
5.2
25
75
5
Top
3.3
1.8
5
8
5
5.25
25
OP6
O
Bottom
3.3
1.8
5
8
5
5.25
25
Top
3.3
1.8
5
8
5
5.25
25
OP7
Botttom
1
12
5
1
15
2
20
5
5.25
7
75
Outtput voltage adjustmentt
Eac
ch output can be adjusted within
w
the rang
ge as describe
ed in the table
e above or in the datasheett. Voltage adjustment can be
b
ach
hieved using th
he manual adjjust potentiom
meter, the pre
eset output vo
oltage (VSET) of
o each outputt module is ad
djustable over the
entire range of VMIN to VMAX as specified in the power proffile table abov
ve. A clockwise rotation of the
t
potentiom
meter results in
n an
incrrease of the output voltage while an antii-clockwise rottation results in a decrease
e of the output voltage.
Rem
mote voltage p
programming is not availab
ble on dual output modules.
Ove
er Voltage Protection (O
OVP)
In the
t
event of a
an output mod
dule fault, the modules are protected aga
ainst excessive output volta
ages. This is im
mplemented as
a a
fixe
ed voltage thre
eshold (VOVP, in the table ab
bove) and if the output volttage exceeds this threshold
d the entire ch
hassis will be
latc
ched off. To re
esume operatiion of the unitt, disconnect the
t
AC input voltage
v
for 2 minutes,
m
remo
ove the faulty
y output modu
ule
and
d reconnect th
he AC input vo
oltage.
Notte that no warrning is given on the AC_OK
K signal for fa
aults of this type.
Ove
er Current Protection (O
OCP)
For increased saffety and reliab
bility all dual output
o
module
es in the NEVO
O series have over current protection. The over current
thre
eshold is typic
cally set at 10
05% of the ratted current an
nd has a hiccu
up mode chara
acteristic that turns off the output if the load
current exceeds the threshold. The output will
w remain offf for a certain period and th
hen attempt to
o restart. The
e module rema
ains
in this state untill the over load
d condition is removed, at which
w
point th
he module returns to norma
al operation.
Notte that hiccup mode currentt limit scheme
es can cause startup
s
issues
s in certain circumstances where
w
load currrents plus an
ny
cap
pacitive charging currents exceed the currrent limit. For reliable designs the user should
s
ensure
e the worst ca
ase measured
starrtup current does
d
not excee
ed 90% of the
e rated curren
nt.
2
24
Rev
verse Curren
nt Protection
n (RCP)
Nev
vo Dual output modules use
e synchronous
s rectification in the output stages to ach
hieve high effiiciency and as
s a result the
outputs can both
h source and sink
s
current. The
T
sink curre
ent is internally limited to approximately -6% of the maximum
m
rated
d
current.
Dua
al output mod
dules should never be directtly connected to to external power sourc
ces without so
ome form of re
everse currentt
protection such a
as an externall diode or controlled mosfett. If protection
n is not used, large reverse
e currents whiich will ultimately
resu
ult in damage
e to the unit will
w occur, espe
ecially when the AC mains is disconnecte
ed.
Sta
art up & Shutt down
All outputs
o
are designed to have a regulated monotonic start-up
s
with a controlled rise time which
h is specified in the datashe
eet.
The
e power good signal stays lo
ow until the voltage
v
for botth outputs is with
w
the powe
er good thresh
hold range (≈6
68% to 120%
%).
Dua
al outputs are not designed
d to start into a pre-biased load and may
y discharge an
ny externally capacitance
c
be
efore beginnin
ng
to ramp
r
the outp
put voltage up
p in the norma
al way.
At shutdown
s
the outputs enterr a high imped
dance state. Where
W
no exte
ernal load is present
p
it may
y take some time for the
volttage to decay. When driving inductive loads, care mus
st be taken to
o limit the volttage at the ou
utput terminals so as to
prevent damage to the unit.
Syn
nchronisation
All dual
d
output m
modules in the
e same chassis
s are synchron
nised. The typ
pical operating
g frequency is
s 260kHz and seriesed units
s
will not produce beat frequenc
cies.
Rip
pple and Nois
se
The
e ripple and no
oise figures sttated in the da
atasheet are defined
d
based on a standarrd measuring method. To obtain the sam
me
resu
ults the same test setup must be used and care must be taken to e
eliminate any parasitic noise pickup. The
e diagram belo
ow
sho
ows details of the setup and
d also sources
s of noise pickup.
Ove
er Temperatture Protectio
on (OTP)
Eac
ch output mod
dule is protectted against ex
xcessive tempe
eratures. In th
he event of th
he internal tem
mperatures ex
xceeding safe
leve
els the entire unit may be latched off. To
o resume operration of the unit,
u
disconnect the AC inpu
ut voltage for 2 minutes,
ens
sure external a
ambient temp
peratures are within
w
specific
cations and th
hen reconnect the AC input voltage. Note
e that no warn
ning
is given
g
on the AC_OK
A
signal for
f faults of th
his type.
Tra
ansient respo
onse
The
e NEVO Dual o
output module
es have been especially des
signed to have
e high reliabiliity and to ach
hieve this all electrolytic
e
cap
pacitors have b
been eliminate
ed from the design. As a re
esult, the typic
cal output cap
pacitance of th
he module is relatively
r
low and
high
h dynamic loa
ad transients can
c
cause rela
atively high vo
oltage deviatio
ons at the outtput. Where th
his causes an application
issu
ue, external lo
ow impedance
e electrolytic capacitance
c
may be added to
t improve the transient response.
How
wever, for Dua
al output mod
dules the maximum recomm
mended extern
nal capacitanc
ce is 220uF. Exceeding
E
this
s value may ca
ause
starrtup issues.
Par
rallel operatiion
Nev
vo Dual Outpu
ut modules cannot be paralleled. Paralleling dual outpu
ut modules may result in damage.
Ser
riesed operation
Nev
vo Dual Outpu
ut modules can be seriesed.
Tem
mperature D
Derating
For Dual Output modules the temperature
t
d
derating
factor applies to ou
utput current not output po
ower.
25
Remote sensing
Remote sensing is available on all Dual output modules and can be used to compensate for a small voltage drop in the main
power leads between the power supply and the load. To implement remote sensing connect the positive sense pin [S+,
connector J5.1 (Top) or J5.3 (Bottom)] to the positive side of the remote load and the negative sense pin [S-, connector J5.2
(Top) or J5.5 (Bottom)] to the negative side of the remote load. The voltage will be regulated at the points where the sense
cables are connected.
In systems where remote sensing is not used, the output voltage at the power terminals will be slightly higher than that at the
sense terminals. This voltage difference is termed, open sense offset and occurs due to internal bias currents in the sensing
circuit. Factory set units are set with the sense cables connected unless otherwise specified.
Isolation
Each output channel in a Nevo Dual output module is fully isolated. Each output is rated for 250 volts maximum between each
output terminal and chassis ground. Exceeding this voltage may damage the unit.
26
Audible noise
The following series of plots characterise the audible noise from the NEVO+1200 power supply over various conditions. These
plots can be used to estimate the actual audible noise for any application.
Noise vs Load (25°C)
56
120Vac
54
220Vac
52
dBA
50
48
46
44
42
40
0
100
200
300
Pout
400
500
600
Noise vs Input voltage (25°C, 600W out)
60
57.5
52.5
50
47.5
45
120
140
160
180
200
Input Voltage (Vrms)
220
240
260
Noise vs Ambient temperature (600W out)
65
dBA
60
55
50
45
150Vac
170Vac
200Vac
40
‐20
‐10
0
10
20
Ambient temperature
30
40
50
Noise vs Ambient temperature (Line derated)
65
60
dBA
dBA
55
55
50
45
85Vac
102Vac
120Vac
40
‐20
‐10
0
10
20
Ambient temperature
30
40
50
27
Me
echanica
al dimensions an
nd mountting
SCREW
WS
MH1, MH2, MH3, MH4, MH
H5
Screw type
M4
Tightening
Penetration
depth
Tighten to 1.5 Nm
4.00mm max
m
including ch
hassis
OUTPUT MOD
DULES x 8
M3x5, C/Sink, Posi, Stainless
Steel
Screw type
Tightening
Penetration
depth
Tighten to 0.75 Nm
Defined by
y screw
CHASSIS x 5
Screw type
Tightening
Penetration
depth
M3x5, C/Sink, Posi, Stainless
Steel
Tighten to 0.75 Nm
Defined by
y screw
FAN x 2
Screw type
Tightening
Penetration
depth
M3x24, C/S
Sink, Posi, Stain
nless
Steel
Tighten to 0.75 Nm
Defined by
y screw
2
28
Co
onnectorrs
PINOUTS
J1
C
Circuit
1
2
3
Details
Live
Earth
Neutra
al
J2
C
Circuit
Details
1
Power Good
2
Inhibit
3
Power Good
4
Inhibit
5
Power Good
6
Inhibit
7
Power Good
8
Inhibit
9
10
11
12
C
Circuit
1
C
Circuit
1
C
Circuit
1
2
3
4
5
6
Slot A
Slot B
Slot C
Slot D
Global Inhibit
AC OK
+5V 20
00mA Bias Supp
ply
COM
J3
Details
Positive Output
J4
Details
Negativ
ve Output
J5
Details
- Sense
e
+ Sens
se
Voltage
e Control
Curren
nt Control / Sharre / Out
COM
+5V lo
ocal bias supply
MATING PART DET
TAILS
M
MANUFACTUR
RER
RE
EF.
DETAILS
HOUSIN
NG
TERMINAL
J1
MAINS INPUT: 3 Pin, 5.08mm, witth Friction Lock, 18--24 AWG
M
MOLEX
10013036
6
8701031
J2
GLOBAL SIGNA
ALS: 12 Pin, 2mm, with
w
Friction Lock, 24-30
2
AWG
M
MOLEX
51110126
60
503948051
J2
IDT ALTERNAT
TIVE FOR J2
M
MOLEX
87568127
73
N/A
J3/J4(1)
OUTPUT POWE
ER TERMINAL: TAB SIZE
S
6.35mmx0.8m
mm
V
VARIOUS
N/A
N/A
J5
OUTPUT SIGNA
ALS: 6 Pin, 1.25mm
m, with Friction lock, 28-32 AWG
M
MOLEX
15102106
600
50058800
No
otes
1. Terminal and Wire
W
current ratting must excee
ed maximum sho
ort circuit outpu
ut current. Eg. Output
O
1 = 25A*1.25 = 31.25A
Amps
2. Direct equivale
ents may be use
ed for any connector parts
3. All cables must be rated 105°
°C min, equivale
ent to UL1015
29
Configuring your power supply
The NEVO+600 power supply is designed to be used as part of an end-system in a restricted environment and therefore
should only be accessible to qualified and trained personnel. Persons attempting to configure a unit must have the necessary
knowledge and training before doing so. Incorrect configuration may cause damage to the power supply and may affect the
warranty of the power supply.
Output power modules may be added, replaced or moved by strictly following the sequence of operations described below.
Please contact Vox Power or your distributor for assistance in configuring your power supply.
STEP 1:
Remove the power connection and all other connections from the power supply.
WARNING!
Leave the unit to stand for a minimum of 3 minutes after removing all power and other connections from the unit before
attempting to configure or re-configure the power supply.
Always remove the power before handling the unit. During operation the external surface of the unit can become hot.
Leave to stand for 10 minutes to allow the unit to cool down before handling the unit.
Dangerous voltages are present within the power supply. Covers may only be removed by qualified personnel when the
power supply has been disconnected from the mains supply voltage for more than 3 minutes. Covers must be replaced
and all screws secured properly before reconnecting to the mains voltage.
STEP 2:
Remove all screws. There are 2 screws at the fan side, 5 screws on the sides and 8 on the top (2 for each slot). The lid can
now be removed. Ensure that all the output modules are loose from the lid before removing the lid.
Top x 8
Fan x 2
Side x 5
30
STEP3:
Once the lid is removed modules can be removed and replaced as required. The 15 pin header on the output module plugs
directly into the connector on the printed circuit board. Each connector is keyed to prevent improper insertion. Insert the
output module and ensure it is pushed down properly. Do not remove the plastic cover on the front-end of the unit.
Plastic Cover
STEP 4:
Once the modules are replaced and the new configuration is complete and the lid can be closed again. A blanking plate must
always be used whenever a slot does not contain an output module. Attach blanking plates to the lid before closing it. Ensure
the plastic cover is in place before closing the lid again. When closing the lid ensure that each output module slots properly
into its corresponding slot in the lid. Insert all the screws and tighten to 1NM. Do not over tighten.
Each Output Module must slot
properly into corresponding slot in lid
WARNING!
Do not apply power to the power supply before replacing the lid and securing all the screws.
STEP 5:
Reconnect the power cable and apply power to ensure all the output modules are working by checking that the LED light on
each output module comes on. Always check the output voltage of each module to ensure it is adjusted to your requirements.
Remove power and attach all other cables. The unit is now ready for use.
31
Safety
The NEVO unit has been designed to comply with the Low Voltage Directive 73/23/EEC (LVD) and is CE marked to show its
compliance.
When correctly installed (according to the installation manual) in a limited access environment the NEVO+600S complies with
the requirements of UL60950-1, EN60950-1, IEC60950-1, CSA22.2 no. 60950-1 and the NEVO+600M complies with the
requirements of UL60601-1, EN60601-1, EN61010-1, IEC60601-1, IEC61010-1, CSA22.2 no 601-1.
The power supply should not be operated close to combustible materials or atmosphere.
Care should be taken to ensure liquid or metal shavings do not enter the power supply as this can cause a fire hazard.
The power supply does not contain any user serviceable parts and should be returned to Vox Power for repair.
Approval limitations (NORTH AMERICA)
When this product is used with 180VAC–253VAC mains where no neutral is present, connect the two live wires to L (Live) and
N (Neutral) on the input connector.
WARNING!
Seriesed modules with combined voltages exceeding 60 volts are not considered SELV. Paralleled and/or seriesed
modules with combined energy ratings greater than 240 VA may cause energy hazards. The equipments manufacturer
must provide additional and adequate protection to service and technical personnel.
Always remove the power before handling the unit. During operation the external surface of the unit can become hot.
Leave to stand for 10 minutes to allow the unit to cool down before handling the unit.
Dangerous voltages are present within the power supply. Covers may only be removed by qualified personnel when the
power supply has been disconnected from the mains supply voltage for more than 3 minutes. Covers must be replaced
and all screws secured properly before reconnecting to the mains voltage.
Parameter
Isolation voltage
Isolation clearance
Isolation creepage
Leakage current
Agency Approvals
Standards
Agency File Numbers
Details
Min
Max
Units
Input to Output
4000
Vac
Input to Chassis
1500
Vac
Output to Chassis
250
Vdc
Output to Output
250
Vdc
Primary to Secondary (Reinforced)
7
mm
Primary to Chassis (Basic)
2.5
mm
Primary to Secondary (Reinforced)
12
mm
Primary to Chassis (Basic)
4
mm
Medical: 265 Vac, 63 Hz, 25°C
300
µA
Standard: 265 Vac, 63Hz, 25°C
1500
CURUS, Demko, CB Certificate
IEC/EN60950-1; UL60950-1/CSAC22.2No.60950-1-03; IEC/EN60601-1; UL60601-1;
CE Mark: LVD 73/23/EEC.
UL : E316486
32
EMC compliance
To support compliance of the final system design with the EMC directive 89/336/EEC, the NEVO PSU has been designed and
tested to the following standards.
Parameter
Emissions
Standard
Level
Radiated electric field
Conducted emissions
Harmonic distorsion
Flicker and fluctuation
EN55011, EN55022, FCC
EN55011, EN55022, FCC
EN61000-3-2
EN61000-3-3
B
B
Compliant
Compliant
EN61000-4-2 (15 kV air, 8 kV contact)
EN61000-4-3 (10 V/m)
EN61000-4-4 (4 kV)
EN61000-4-5 (1 kV L-N, 2 kV L-E)
EN61000-4-6 (10 V)
EN61000-4-8 (10 A/m)
EN61000-4-11 (EN55024)
4
3
4
3
4
3
Compliant
Immunity
Electrostatic discharge
Radiated RFI
Fast transient burst
Input line surges
Conducted RFI
Power freq. Magnetic field
Voltage dips
For radiated and conducted emissions, compliance of the final system relies on proper installation of the PSU component. The
installation guidelines detailed below should be followed.
Installation guidelines for EMC
NEVO units should be mounted within a metal enclosure using the mounting fixtures provided. If the application enclosure is
not metal then a metal ground plate should be used to mount both the power supply and the load.
Decoupling the loads to the chassis or ground plate with suitably rated 100nF capacitors can assist in reducing emissions.
Both input and output cables should be fixed as close as possible to the ground plate or metal enclosure. Also, input and
output cables should be separated as much as possible.
Output power and sense cables should be twisted pairs and routed parallel to each other. Do not twist sense and power cables
together.
All cables lengths and loop areas should be minimised.
Where cables must enter or exit the enclosure, good high frequency 100nF decoupling capacitors of sufficient voltage rating
should be connected to the cables as close to the entry/exit point as possible.
For further details or assistance contact Vox Power.
33
Reliability
The Nevo series has undergone extensive testing, including HALT and Environmental testing. Reliability data is collected on an
ongoing basis. Please contact Vox Power or your distributor for the most up to date reliability data.
Vox Power Ltd. reserves the right to change or improve any part of the specification, electrical or mechanical design or manufacturing process without notice. Please consult your local
distributor or contact Vox Power to ensure that you have the latest specification before using your product. For other information relating to the use of the product please refer to the
latest NEVO user manual. Vox Power reserves the right to make changes without notice to any of its products. Vox Power does not assume any liability arising out of the use or
application of any of its products and of any information to the maximum extent permitted by law. No license, express or implied, by estoppel or otherwise, to any intellectual property
rights is granted by this document or by any conduct of Vox Power. VOX POWER DISCLAIMS ALL WARRANTIES AND REPRESENTATIONS. IN PARTICULAR ALL OTHER WARRANTIES,
CONDITION OR TERMS RELATING TO SUITABILITY, FITNESS FOR PURPOSE, MECHANTABILITY OR CONDITION OF THE PRODUCTS AND WHETHER EXPRESS OR IMPLIED BY STATURE OR
COMMON LAW OR OTHERWISE ARE EXCLUDED.
Document DOC6101 rev 01, 28/02/2014