Siemens CU240B-2 - Mounting and Connecting the Brake Relay

Installing
4.5 Connecting the line supply, motor, and inverter components
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
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4.5.4.1
Mounting and connecting the Brake Relay
The Brake Relay must be connected to the protective conductor if the motor brake is
supplied from a PELV circuit.
4.5.4.2
Mounting and connecting the Safe Brake Relay
The Safe Brake Relay must be connected to the protective conductor if the motor
brake is supplied from a PELV circuit.