Siemens SINAMICS S120 Function Manual page 585

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 cannot be used until at least one safety monitoring
function has been enabled (i.e. p9601 = p9801 ≠ 0).
Two-channel brake control
Note
Connecting the brake
The brake cannot be directly applied at the Motor Module of chassis format. The connection
terminals are only designed for 24 VDC with 150 mA; the Safe Brake Adapter is required for
larger currents and voltages.
The brake is essentially controlled from the Control Unit. Two signal paths are available for
applying the brake.
Figure 9-1
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 diagnostics can only reliably detect a malfunction in either of the switches (TB+,
TB–) when the status changes, i.e. 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.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Two-channel brake control, blocksize (example)
Safety Integrated basic functions
9.6 Safe Brake Control (SBC)
583