Connecting A Motor Holding Brake; Mounting And Connecting The Brake Relay - Siemens SINAMICS G120 Hardware Installation Manual

8.3.5

Connecting a motor holding brake

The converter uses the Brake Relay to control the motor holding brake. Two types of Brake Relay
exist:
• The Brake Relay controls the motor holding brake
• The Safe Brake Relay controls a 24 V motor holding brake and monitors the brake control for
short-circuit or cable breakage.
Note
Brake Relay and Safe Brake Relay
There are no differences between the Brake Relay and the Safe Brake Relay in terms of installation
and connection to the converter.
Connection to the converter
To ensure that you have the correct cable for connecting the Brake Relay irrespective of the
converter size, you are supplied with two preassembled cables with different lengths. Connect
the appropriate cable to the Brake Module and to the converter as shown below.
If you are using your own cable, ensure that the cable is insulated and rated for 600 V.
Connecting the motor holding brake via a PELV circuit
The Brake Relay must be connected to the protective conductor if the motor brake is supplied
from a PELV circuit.
8.3.5.1

Mounting and connecting the brake relay

Brake Relay
PM250 Power Module
Hardware Installation Manual, 04/2021, A5E36265179B-AB
Spare parts and accessories
8.3 Optional accessories
79