Safety Integrated Functions
8.4 Safety Integrated Basic Functions
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
357
8.4.3 Safe Brake Control (SBC)
Description
The "Safe Brake Control" function (SBC) is used to control holding brakes that function
according to the quiescent current principle (e.g. motor holding brakes).
The command for releasing or applying the brake is transmitted to the Safe Brake Relay via
the Power Module. The Safe Brake Relay then carries out the action and activates the
outputs for the brake accordingly.
Brake activation via the brake connection on the Safe Brake Relay is carried out using a
safe, two-channel method.
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 SINAMICS S110).
When the Power Module is configured automatically, the Safe Brake Relay is detected and
the motor holding brake type is defaulted (p1278 = 0).
WARNING
"Safe Brake Control" does not detect faults in the brake itself, such as brake winding short-
circuit, worn brakes, etc.
If a cable breaks, this is only recognized 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
performed with safe pulse suppression.
● 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
recommended, however, when 1215 = 0 or 3.
● The function must be enabled via parameter.
● When SBC is enabled, the holding brake is applied immediately with forced dormant error
detection each time "Safe Torque Off" is selected.
● The input terminals can be debounced to prevent signal faults triggering other faults.
Parameters p9651 and p9851 are used to set filter times.
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