Siemens SINAMICS G120 Operations Instructions download pdf (Page 202)

Functions

7.9 Application-specific functions

Inverter with CU240B-2 and CU240E-2 Control Units

200 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

Principle of operation after OFF1 and OFF3 command

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Figure 7-16 Controlling the motor holding brake when the motor is switched on and off

The motor brake is controlled as shown in the following diagram:

1. After the ON command (switch on motor), the inverter magnetizes the motor. At the end

of the magnetizing time (p0346), the inverter issues the command to open the brake.

2. The motor remains at a standstill until the end of the brake opening time p1216. The

motor holding brake must open within this time.

3. At the end of the brake opening time the motor accelerates to its speed setpoint.

4. After the OFF command (OFF1 or OFF3) the motor brakes to a standstill.

5. If the speed setpoint and the current speed fall below threshold p1226, the monitoring

time p1227 or p1228 is started.

6. As soon as the first of the two monitoring 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.

7. At the end of the brake closing time p1217, the motor is switched off.

The motor holding brake must close within this time.

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Siemens SINAMICS G120 Operations Instructions Page 202