Siemens SINUMERIK 840D sl Function Manual page 55

03.06
Two-channel brake control
The brake is controlled from the Control Unit. The brake can be closed through two
signal paths.
NCU 7x0
X132
Fig. 4-3
For the safe brake control, the Motor Module carries-out a check to ensure that if
the Control Unit fails or is faulty, the brake current is interrupted and the brake is
closed.
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.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
DRIVE–
CLiQ
BR2
Two-channel brake control
Safety Functions Integrated in the Drive
4.3 Safe brake control (SBC)
EP (Enable Pulses)
Motor Modules
P24
TB+
BR1
Brake diagnostics
TB–
M M
Closed–circuit brake
BR+
Motor
BR–
4-55