Safe Brake Control (Sbc) - Siemens SINUMERIK 840D sl Function Manual

Safety Functions Integrated in the Drive

4.3 Safe brake control (SBC)

4.3 Safe brake control (SBC)
Description
Safe brake control is used to activate holding brakes that function according to the
closed-circuit principle (e.g. brake).
The command for releasing or applying the brake is transmitted to the Motor Mod-
ule via DRIVE-CLiQ. The Motor Module then carries out the action and activates
the outputs for the brake.
Brake activation via the brake connection on the Motor Module is carried out using
a safe, two-channel method.
Warning
!
Safe brake control does not detect faults in the brake itself – such as e.g. brake
winding short-circuit, worn brakes and similar.
If the brake cable has a short-circuit, this is only detected when the brake closes.
Safe brake control only detects faults in the brake cables (e.g. interrupted cable)
when the status changes – i.e. when the brake either opens or closes.
Features of safe brake control (SBC)
S When safe standstill is selected or when safety monitor functions respond with
safe pulse cancellation, SBC is initiated.
S Unlike conventional brake control, SBC is implemented via p1215 through two
channels.
S SBC is initiated independently of the brake control mode set in p1215.
S The function must be enabled via parameter.
S Every time safe standstill is selected, the holding brake is immediately closed
and a forced checking procedure carried-out.
Enabling the safe brake control (SBC) function
The safe brake control function is enabled using the following parameters:
S p9602
S p9802
The safe brake control function only becomes active if at least one safety monitor-
ing function is enabled (i.e. p9601 = p9801 0).
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
"SI enable safe brake control (Control Unit)"
"SI enable safe brake control (Motor Module)"
© Siemens AG, 2006. All rights reserved
03.06