Siemens SINAMICS G120 Operating Instructions Manual page 218

Functions
9.9 Application-specific functions
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
2. The motor remains at a standstill until the end of the brake opening time p1216. The
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 actual speed is less than 20 rpm, then the inverter issues the command to close the
6. At the end of the brake closing time p1217, the motor is switched off.
Principle of operation after OFF2 or STO command
For the following signals, the brake closing time is not taken into account:
● OFF2 command
● For fail-safe applications, in addition, after "Safe Torque Off" (STO)
After these control commands, the signal to close the motor holding brake is immediately
output independent of the motor speed. The inverter does not monitor the motor speed until
the brake closes.
Figure 9-28
216
of the magnetizing time (p0346), the inverter issues the command to open the brake.
motor holding brake must open within this time.
brake. The motor comes to a standstill but remains switched on.
The motor holding brake must close within this time.
Controlling the motor holding brake after an OFF2 command or STO
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB