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Page 4-24
Vacon
PI-control Application
a)
tOFF = Par. 3. 17
tON = Par. 3. 18
External
BRAKE: OFF
Digital or
relay output
ON
DIA1: RUN FWD
STOP
DIA2: RUN REV
t
STOP
UD012K45
b)
tOFF = Par. 3. 17
tON = Par. 3. 18
External
BRAKE: OFF
Digital or
relay output
ON
DIA1: START
PULSE
DIA2: STOP
PULSE
t
Figure 4.5-11 External brake control: a) Start/Stop logic selection par. 2. 1 = 0, 1 or 2
b)Start/Stop logic selection par. 2. 1 = 3.
4. 1
4. 2
Acc/Dec ramp 1 shape
Acc/Dec ramp 2 shape
A smooth start and end of acceleration and deceleration can be programmed with
these parameters.
Setting value 0 gives linear ramp shape which causes acceleration and deceleration
to act immediately to the changes in the reference signal with the time constant
set by the parameter 1.3 and 1.4 (4.3 and 4.4).
4
Setting value 0.1—10 seconds for
4.1
(4.2)
causes
linear
acceleration/deceleration to
adopt an S-shape. Parameter 1.3
and 1.4 (4.3 and 4.4) determines
the time constant of acceleration/
deceleration in the middle of the
curve.
See figure 4.5-12.
Figure 4.5-12 S-shaped acceleration/
deceleration.
[Hz]
1. 3, 1. 4
(4. 3, 4. 4)
4. 1 (4. 2)
4. 1 (4. 2)
[t]
UD009K20
4. 3
4. 4
Acceleration time 2
Deceleration time 2
These values correspond to the time required for the output frequency to accelerate
from the set minimum frequency (par. 1. 1) to the set maximum frequency
(par. 1. 2). These times give the possibility to set two different acceleration/
deceleration times for one application. The active set can be selected with the
programmable signal DIA3 of this application, see parameter 2. 2.
Acceleration/deceleration times can be reduced with external free analogue input
signal, see parameters 2. 18 and 2. 19.
Vacon Plc
Tel:
+358-201-2121
On-call: +358-40-8371 150
Fax:
+358-201-212 205
E-mail: [email protected]