Efficient Networks Siemens Sinamics S120 - Manual (Page 313)

Safety Integrated basic functions
9.5 Safe Brake Control (SBC)
Drive Functions
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
313
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 cancellation.
● 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.
● Each time "Safe Torque Off" is selected, the holding brake is applied immediately with
forced dormant error detection.
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)
The "Safe Brake Control" function is not active until at least one safety monitoring function
has been enabled (i.e. p9601 = p9801 ≠ 0).
Two-channel brake control
The brake is controlled from the Control Unit. Two signal paths are available for applying the
brake.