Siemens S120 - Option Module Safe Brake Relay; Introduction; Safety Instructions for Safe Brake Relays

Supplementary system components and encoder system integration
8.2 Option module Safe Brake Relay
AC Drive
378 Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
8.2
Option module Safe Brake Relay
8.2.1
Introduction
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 8- 21 Interface overview the Safe Brake Relay
Type
Number
Connection for the solenoid of the motor brake
1
Connection for a 24 VDC power supply
1
Connection for the pre-fabricated (CTRL) to the
Power Module, Blocksize format
1
The Safe Brake Relay is supplied with the pre-fabricated cable to connect to the Power
Module and all of the customer connectors.
8.2.2
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 drops of the connection cables must be taken into account.
The DC power supply should be set to 26 V. This ensures that the supply voltage for the
brake remains within the pe
rmissible range when the following conditions are fulfilled:
•
Use of Siemens three-phase motors
•
Use of Siemens MOTION-CONNECT power cables
•
Motor cable lengths: max. 100 m