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VersiStart p III
Soft Brake
For applications with high inertia and/or a variable load requiring the maximum
possible braking torque, the VersiStart p III can be configured for soft braking.
The VersiStart p III uses a changeover relay to control forward run and braking
contactors. While braking, the VersiStart p III reverses the phase sequence to the
motor and supplies reduced current, gently slowing the load.
When motor speed approaches zero, the zero speed sensor (A2) stops the soft
starter and opens the braking contactor (K2).
Soft braking can be used with both the primary and secondary motor sets, and must
be configured separately for each.
Parameter settings:
•
Parameter 2I
Stop Mode
: set to 'Soft Brake'
•
Parameter 2Q
Brake Current Limit
: set as required to slow the load
•
Parameter 2R
Soft Brake Delay
: controls the time the soft starter will wait
after a stop signal is received, before it begins to supply braking current to
the motor. Set to allow time for K1 and K2 to switch.
•
Parameter 7A
Input A Function
: set to 'Zero Speed Sensor'
•
Parameter 8A
Relay A Function
: set to 'Soft Brake Relay'
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4
1
2
3
5
1
Three-phase supply
K1
Line contactor (Run)
2
Motor terminals
K2
Line contactor (Brake)
3
Relay output A
A2
Zero speed sensor
4
K1/K2 coil supply
5
Programmable input A
Summary of Contents for VersiStart p III 105
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