Safe Brake Test (Sbt) - Siemens SINAMICS S120 Function Manual

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
4.2.12

Safe Brake Test (SBT)

Note
SBT only with encoder
The "Safe Brake Test" (SBT) diagnostic function can only be used with an encoder.
The diagnostic function "Safe Brake Test" function (SBT) checks the holding torque of a
brake (operating or holding brake). The drive purposely generates a configurable torque
against the applied brake. If the brake is operating correctly, the axis motion remains within a
parameterized tolerance. However, if larger axis motion is identified from the encoder actual
values, the brake is not in a position to provide the specified holding torque. The brake must
now be serviced or replaced.
Features
The Safe Brake Test function has the following properties:
● The parameters of the "SBT" function are protected by the safety password, and can only
be changed in the safety commissioning mode.
● Using this function, brakes can be tested that are directly connected to SINAMICS S120
(integrated brake control), but also externally controlled brakes (e.g. via a PLC).
● A maximum of 2 brakes can be tested:
– A motor holding brake, controlled by the integrated brake control of the SINAMICS,
– 2 externally controlled brakes
– A motor holding brake, controlled by the integrated brake control of the SINAMICS.
– One externally controlled brake
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and in addition, an externally controlled brake.
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated