SINAMICS Safety Integrated (Booksize)
Safe brake control (SBC)
5-160
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
Two-channel brake control
The brake is controlled from the Control Unit. Two signal paths are available for
applying the brake.
Motor Module
safety_sbc.vsd
Control Unit
TB+
TB–
P24
Motor
Standby current brake
Brake diagnosis
M
M
BR2
DRIVE–
CLiQ
BR1
BR+
BR–
X132
EP (enable pulses)
Fig. 5-3 Two-channel brake control
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.
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