Siemens SINAMICS S120 Installation And Start-Up Manual page 160

SINAMICS Safety Integrated (Booksize)
Safe brake control (SBC)
Two-channel brake control
The brake is controlled from the Control Unit. Two signal paths are available for
applying the brake.
Control Unit
X132
safety_sbc.vsd
Fig. 5-3
The Motor Module carries out a check to ensure that the "Safe brake control" func-
tion is working properly and ensures that the brake current is interrupted and the
brake applied if the Control Unit fails or is faulty.
The brake diagnosis can only reliably detect a malfunction in either of the switches
(TB+, TB–) when the status changes (when the brake is released or applied).
If the Motor Module or Control Unit detects a fault, the brake current is switched off
and the safe status is reached.
5-160
DRIVE–
CLiQ
BR2
Two-channel brake control
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
EP (enable pulses)
Motor Module
P24
TB+
BR1
Brake diagnosis
TB–
M
M
E Siemens AG, 2004. All rights reserved
Standby current brake
BR+
Motor
BR–