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

3.2.10

Safe Brake Test (SBT)

The diagnostic function "Safe Brake Test" func-
tion (SBT) checks the required holding torque of
a brake (operating or holding brake).
You can test linear axes and rotary axes. The
drive purposely generates a force/torque
against the applied brake. If the brake is operat-
ing correctly, the axis motion remains within a
parameterized tolerance. If, however, a larger
axis motion is detected, it must be assumed that
the braking force/torque has deteriorated and
maintenance 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 is suitable for safety functions up to
Category 2 according to ISO 13849-1.
Details and parameterization
For further details and information on how to parameterize this function, see Chapter "Safe
Brake Test (SBT) (Page 138)".
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Overview of Safety Integrated functions
3.2 Safety Integrated Extended Functions
61