Sbt - Siemens SINUMERIK MC Commissioning Manual

Safety functions integrated in the drive

4.15 SBT

4.15 SBT
The diagnostic function "Safe Brake Test"
function (SBT) checks the required hold‐
ing torque of a brake (operating or holding
brake).
You can test linear and rotary brakes. The
drive purposely generates a force/torque
against the applied brake. If the brake is
operating correctly, the axis motion re‐
mains within a parameterized tolerance.
If, however, a larger axis motion is detec‐
ted, it must be assumed that the braking
force/torque has deteriorated and main‐
tenance is required.
The "Safe Brake Test" function allows a safe test of up to two brakes:
● 1 motor holding brake and 1 external brake
● 2 external brakes
● 1 motor holding brake
● 1 external brake
The Safe Brake Test (SBT) diagnostic function complies with the requirements for Category 2
according to EN ISO 13849‑1.
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, and
– Two externally controlled brakes
– A motor holding brake, controlled by the integrated brake control of the SINAMICS.
– One externally controlled brake
● The "Safe Brake Test" function complies with SIL 1 according to IEC 61508 or PL d/Cat. 2
according to EN ISO 13894‑1.
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in addition, an externally controlled brake.
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB