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

4.3

Safe Brake Control (SBC)

Description
The "Safe Brake Control" function (SBC) is used to control holding brakes that function
according to the closed-circuit 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 with an order number ending from ...xxx3 and higher 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 or mechanical defects.
The system does not detect whether a brake is e.g. worn or has a mechanical defect,
whether it opens or closes.
A cable break or a short-circuit in the brake winding is only detected when the state
changes, i.e. when the brake either opens or closes.
Functional features of "Safe Brake Control"
● When "Safe Torque Off" (STO) is selected or when safety monitoring functions respond,
● 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 using parameters.
● If SBC is enabled, each time "Safe Torque Off" is selected, the holding brake is closed
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
WARNING
SBC is executed with safe pulse suppression.
recommended, however, when 1215 = 0 or 3.
immediately with forced dormant error detection.
Safety Integrated Basic Functions
4.3 Safe Brake Control (SBC)
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