63
VersiStart i III
11.6
Soft Braking
For applications with high inertia and/or a variable load, the VersiStart i III can be configured for soft braking.
In this application the VersiStart i III is employed with forward run and braking contactors. When the VersiStart i III receives a start signal
(pushbutton S1), it closes the forward run contactor (K1) and controls the motor according to the programmed primary motor settings.
When the VersiStart i III receives a stop signal (pushbutton S2), it opens the forward run contactor (K1) and closes the braking contactor
(K2) after a delay of approximately 2-3 seconds (K1T). K12 is also closed to activate the secondary motor settings, which should be user
programmed for the desired stopping performance characteristics.
When motor speed approaches zero, the zero speed sensor (A2) stops the soft starter and opens the braking contactor (K2).
3
6
53
5
6
1
2
3
4
1
Control voltage (model dependent)
A2
Zero speed sensor
2
Remote control inputs
K10
Run relay
3
Motor thermistor input
K11
Start relay
4
Relay outputs
K12
Brake relay
5
Three-phase supply
K13
Zero speed sensor relay
6
Motor terminals
K1
Line contactor (Run)
13, 14
Relay output A (default = Main Contactor)
K2
Line contactor (Brake)
21, 22, 24 Relay output B (default = Run)
K1T
Run delay timer
33, 34
Relay output C (default = Trip)
K2T
Brake delay timer
53, 55
Programmable input A (default = Motor Set Select)
K3T
Zero speed sensor delay timer
S1
Start
contact
S2
Stop
contact
S3
Reset
contact
Parameter settings:
x
Parameter 6D Input A Function (terminals 53, 55)
x
Select 'Motor Set Select' - assigns Input A for Motor set selection.
x
Set starting performance characteristics using the primary motor set.
x
Set braking performance characteristics using the secondary motor settings.
x
Parameter 7G Relay C Function
x
Select 'Trip' - assigns Trip function to Relay Output C.
NOTE
If the VersiStart i III trips on supply frequency (parameter 16F Frequency) when the braking contactor K2 opens, modify
the frequency protection settings.
