Setting functions
8.8 Application-specific functions
Converter with control units CU250D-2
228 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
The motor holding brake prevents the motor turning when it is switched off. The converter
has internal logic to optimally control a motor holding brake.
Function after OFF1 and OFF3 command
The inverter controls the motor holding brake in the following way:
● After the ON command (to switch on motor), the inverter magnetizes the motor.
● After the magnetizing time (p0346), the inverter issues the command to open the brake.
● The inverter keeps the motor at a standstill up until the end of the time in p1216. The
motor holding brake must open within this time.
● At the end of the brake opening time the motor accelerates to the speed setpoint.
● After the OFF command (OFF1 or OFF3) the motor brakes to a standstill.
● When braking, the inverter compares the speed setpoint and the actual speed with the
speed threshold p1226:
If the speed setpoint falls below the threshold p1226, the inverter starts the time p1227.
If the actual speed falls below the threshold p1226, the inverter starts the time p1228.
● As soon as the first of the two times (p1227 or p1228) has elapsed, the inverter issues
the command to close the brake.
The motor comes to a standstill but remains switched on.
● After the brake closing time p1217, the inverter switches off the motor.
The motor holding brake must close within this time.
Figure 8-42 Controlling the motor holding brake when the motor is switched on and off
To Next Page
Loading...
