Siemens SINAMICS S120 Function Manual page 690

Safety Integrated Basic Functions
10.6 Safe Brake Control (SBC)
Functional features of "Safe Brake Control"
● SBC is executed when "Safe Torque Off" (STO) is selected.
● In contrast to conventional brake control, SBC is executed via two channels.
● SBC is executed regardless of the brake control or mode set in p1215. However, SBC
does not make sense for 1215 = 0 or 3.
● The function must be enabled using parameters.
● When the state changes, electrical faults, such as a short-circuit in the brake winding or
wire breakage can be detected.
Enabling the "Safe Brake Control" function
The "Safe Brake Control" function is enabled via parameter p9602.
The SBC function can be used only together with STO. The selection of SBC alone is not
possible.
Two-channel brake control
Note
Connecting the brake
The brake cannot be directly connected to the Motor Module in chassis format: A Safe Brake
Adapter is also required.
The brake is controlled from the Control Unit. Two signal paths are available for applying the
brake.
Figure 10-1
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.
690
Two-channel brake control, blocksize (example)
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions