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

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
4.2.15

Safe Brake Test (SBT)

Not e
S B T only with encoder
The "Safe Brake Test" (SBT) safety 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,
– Two externally controlled brakes
– A motor holding brake, controlled by the integrated brake control of the SINAMICS.
– One externally controlled brake
● The following options are available to control the SBT function:
– BICO interconnection; here, digital signals (e.g. DIs) are used to operate the SBT
– Safety Control Channel (SCC) via PROFIBUS or PROFINET
– The brake test can be automatically executed when the forced checking procedure
● The Safe Brake Test (SBT) diagnostic function meets the requirements for Category 2
according to EN ISO 13849-1.
You will find an application example of the calculation at this address
(https://support.industry.siemens.com/cs/ww/en/view/69870640).
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and in addition, an externally controlled brake.
function.
Using SCC, the SBT function can be directly controlled from a higher-level control
system. You can find additional information about SCC and SIC data in Chapter
"Safety Info Channel and Safety Control Channel (Page 207)".
(test stop) is selected. No additional signals are required for the control. However, the
test possibilities are restricted.
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Safety Integrated