Safe Brake Control (Sbc) - Siemens SINAMICS S120 Function Manual

9.5

Safe Brake Control (SBC)

Description
Safe brake control is used to activate holding brakes that function according to the standby
current principle (e.g. motor holding brake).
The command for releasing or applying the brake is transmitted to the Motor Module/Power
Module via DRIVE-CLiQ. he Motor Module/Safe Brake Relay then carries out the action and
activates the outputs for the brake.
Brake activation via the brake connection on the Motor Module/Safe Brake Relay involves a
safe, two-channel method.
Note
Chassis components do not support this function.
Note
To ensure that this function can be used for Blocksize Power Modules, a Safe Brake Relay
must be used (for more information, see the Equipment Manual).
When the Power Module is configured automatically, the Safe Brake Relay is detected and
the motor holding brake type is defaulted (p1278 = 0).
The "Safe Brake Control" function does not detect electrical faults in the brake itself (e.g.
short-circuit of brake winding) or mechanical defects (e.g. worn brakes).
If a cable breaks, this is only detected by the "Safe Brake Control" function when the status
changes (i.e. when the brake is applied/released).
Functional features of "Safe Brake Control" (SBC)
● When "Safe Torque Off" is selected or when safety monitors are triggered, "SBC" is
● Unlike conventional brake control, SBC is executed via p1215 through two channels.
● SBC is executed regardless of the brake control or mode set in p1215. SBC is not
● The function must be enabled via parameter.
● Each time "Safe Torque Off" is selected, the holding brake is applied immediately with
Enabling the "Safe Brake Control (SBC)" function
The "Safe Brake Control" function is enabled via the following parameters:
● p9602 SI enable safe brake control (Control Unit)
● p9802 SI enable safe brake control (Motor Module)
Drive functions
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
WARNING
performed with safe pulse suppression.
recommended, however, when 1215 = 0 or 3.
forced dormant error detection.
Safety Integrated basic functions
9.5 Safe Brake Control (SBC)
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