Siemens SINAMICS V90 Operating Instructions Manual page 126

Connecting
4.7 Motor holding brake
Connection example
For 200 V variant servo drive
The following shows the example when the brake is controlled through the motor holding
brake signal (Brake) of the 200 V variant servo drive.
Note
It is the Isolated digital output power supply. Select a proper power supply based on the
1)
relay type. When you use the 24 VDC power supply, it can be also the controller power
supply.
The motor brake can be controlled not only by the brake control signal from the SINAMICS
2)
V90 servo drive but also by external emergency stop.
Never use the same power supply for the brake (24 VDC) and for the brake control signal
3)
(P24 V).
Install a surge absorber or a diode as shown above to suppress the surge voltage or surge
4)
current generated by an ON/OFF action of the relay (RY). When you use a diode, the time
period from brake release to brake engagement is longer than the case when you use a
surge absorber.
126
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2016, A5E36037884-002