Option Module Safe Brake Relay; Description; Safety Instructions For Safe Brake Relays - Siemens SINAMICS S120 Equipment Manual

Supplementary system components and encoder system integration

9.3 Option module Safe Brake Relay

9.3 Option module Safe Brake Relay
9.3.1

Description

A Safe Brake Relay is required for operating motors with holding brakes up to 2 A.
The Safe Brake Relay is the interface between the Control Unit/Blocksize Power Modules
and the 24 VDC motor brake.
The motor brake is electronically controlled.
The supply voltage for the motor brake must be separately connected to the Safe Brake
Relay. A regulated power supply is required, whose rated value (to compensate for the
voltage drop in the supply cable for the 24 VDC motor brake coil) can be set to 26 V, e.g.
SITOP modular.
Table 9- 26
Type
Connection for the solenoid of the motor brake
Connection for a 24 VDC power supply
Connection for the pre-fabricated (CTRL) to the
Power Module, Blocksize format
The Safe Brake Relay is supplied with the pre-fabricated cable to connect to the Power
Module and all of the customer connectors.
9.3.2

Safety instructions for Safe Brake Relays

Note
A regulated DC power supply is required to operate motors with a built-in holding brake. The
voltage is supplied via the internal 24 V busbars. The voltage tolerances of the motor holding
brakes and the voltage losses of the connection cables must be observed.
• Set the DC power supply to 26 V. This ensures that the power supply for the brake
remains within the permissible range when the following conditions are met:
– Use of Siemens three-phase motors
– Use of Siemens MOTION-CONNECT power cables
– Motor cable lengths: max. 100 m
338
Interface overview the Safe Brake Relay
Number
1
1
1
Manual, 06/2019, 6SL3097-5AL00-0BP1
AC Drive