Siemens SINAMICS S120 Function Manual page 60

Safety Integrated Basic Functions
4.3 Safe Brake Control (SBC)
● When the state changes, electrical faults, such as e.g. a short-circuit in the brake winding
● A debounce function can be applied to the terminals of the Control Unit and the Motor
Enabling the "Safe Brake Control" 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 selected until at least one safety monitoring function
has been enabled (i.e. p9601 = p9801 ≠ 0).
Two-channel brake control
The brake is essentially controlled from the Control Unit. Two signal paths are available for
applying the brake.
Figure 4-1
For the "Safe Brake Control" function, the Motor/Power Module assumes a monitoring
function to ensure that when the Control Unit fails or malfunctions the brake current is
interrupted therefore closing the brake.
The brake diagnosis can only reliably detect a malfunction in either of the switches (TB+, TB-)
when the status changes (when the brake is released or applied).
If the Motor Module or Control Unit detects a fault, the brake current is switched off and the
safe status is reached.
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or wire breakage can be detected.
Module in order to prevent incorrect trips due to signal disturbances. The filter times are
set using parameters p9651 and p9851.
Two-channel brake control, blocksize
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated