Siemens SINAMICS S120 Function Manual page 141

● The following options are available to control the SBT function:
– BICO interconnection; this setting uses digital signals (e.g. DIs) 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 is suitable for safety functions up to
Category 2 according to ISO 13849-1.
Safe Brake Test (SBT) is suitable as diagnostics function for a brake that is controlled in
a safety-relevant fashion (e.g. via SBC). With one brake in a Category 2 application and
with 2 brakes in a Category 3 application, a Performance Level of up to Category PL d
can be achieved with an adequate test rate.
You will find an application example of the calculation at this address
(https://support.industry.siemens.com/cs/ww/en/view/69870640).
Preconditions
The following preconditions must be satisfied when using the "Safe Brake Test" function:
● The Safety Integrated Extended Functions must be enabled; also available for the Safety
Integrated Extended Functions without selection.
To acknowledge errors when exiting the brake test, "Extended Functions without
selection and Basic Functions via onboard terminals" must be activated
(p9601 = 0025 hex).
● Safety Integrated Extended Functions with encoder have been enabled
You can find information about possible encoder concepts in Chapter "Notes regarding
safe actual value sensing using an encoder system (Page 155)".
● Speed control with encoder (p1300 = 21).
SBT is not possible with encoderless speed control (e.g. vector V/f control) and torque
control. In this case, alarm A01784 is output.
Note
SBT and SBC
The Safe Brake Control (SBC) function must be activated to control a motor holding brake in
a safety-relevant fashion.
However, this is not necessary to perform the brake test.
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
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 251)".
(test stop) is selected. With this setting, no additional signals are required for the
control. However, the test possibilities are restricted.
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
139