Safe Brake Control (Sbc) - Siemens SINAMICS S120 Function Manual

11.6

Safe Brake Control (SBC)

The "Safe Brake Control" function (SBC) is used to safely control holding brakes that function
according to the closed-circuit principle (e.g. motor holding brake).
The opening and closing of the brake is controlled by the Motor Module / Power Module.
Terminals are available for this on the device in booksize format. A Safe Brake Relay is also
required for the "Safe Brake Control" in the blocksize format. A Safe Brake Adapter is required
in the chassis format (starting with article numbers ending with ...3). When the Power Module
is configured automatically, the Safe Brake Relay is detected and the motor holding brake type
is defaulted (p1278 = 0).
Brake activation via the brake connection on the Motor Module / Safe Brake Relay (SBR) / Safe
Brake Adapter (SBA) involves a safe, two-channel method.
Note
No SBC for SINAMICS HLA
SINAMICS HLA does not support Safe Brake Control.
Note
Controlling the brake via a relay for "Safe Brake Control":
If you use the "Safe Brake Control (SBC)" function, the use of relays/contactors can cause
faults in the brake control when brakes are switched. For this reason, this type of control is not
generally permissible.
Undesirable motor motion due to defective brake
"Safe Brake Control" does not detect mechanical defects of the brake.
A cable break or a short-circuit in the brake winding is only detected when the state changes,
i.e. when the brake either opens and/or closes. In SINAMICS S120M, a cable break is only
identified when opening the brake.
For devices in Chassis format with connected Safe Brake Adapter, the connecting cable
between the Safe Brake Adapter and the motor brake is not monitored for cable break or short-
circuit.
The aforementioned defects may trigger unwanted motor motion, which may result in physical
injury or death.
● In particular, ensure the brake is not powered from an external source. Information on this
● During commissioning, test the brake using the diagnostic function "Safe Brake Test
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
WARNING
topic can be found in EN 61800‑5‑2, Appendix D.
(SBT)" (Safety Integrated Extended Function): Detailed information can be found in the
"SINAMICS Safety Integrated Function Manual".
Safety Integrated Basic Functions
11.6 Safe Brake Control (SBC)
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