Safe Brake Relay; Safety Information - Siemens SINAMICS S120 Equipment Manual

Supplementary system components and encoder system integration
7.5 Option modules, brake control
7.5.3

Safe Brake Relay

The Safe Brake Relay in conjunction with Power Modules of the Blocksize format can be
used to trigger a 24 V DC motor brake.
The brake is electronically controlled. All holding brakes can be used up to 2 A. To operate
the brake, it is necessary to connect the power supply voltage for the brake separately at the
option module brake control. In this case, a regulated power supply is necessary whose
rated value of 26 V should be able to be set, e.g. SITOP modular.
Table 7-33
Type
Connection for the solenoid of the motor brake
Connection for a 24 V DC power supply
Connection for the pre-fabricated (CTRL) to the
Power Module, Blocksize format
The Safe Brake Relay includes the pre-fabricated cable to connect to the Power Module and
all of the customer connectors.
7.5.3.1

Safety Information

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 voltage supply for the
brake remains within the permissible range when the following conditions are fulfilled:
• Using Siemens three-phase motors
• Using Siemens MOTION-CONNECT power cables
• Motor cable lengths: max. 100 m
7-42
Overview of the Safe Brake Relay interfaces
Number
1
1
1
Equipment Manual AC Drive
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0