ABB FSO-12, User Manual

Page: 123 / 388

Safety functions 123
D Zero speed limit (parameter FSOGEN.51 ): Speed limit to define the motor as stopped.
The safety function is completed and the SSE completed indication (parameter SSE.22 )
goes on. The acknowledgment becomes allowed.
SLS trip limit (A)
Step Description
1 The SLS request is received, the motor speed is below the SLS limit positive (B) and
the FSO starts the SLS monitoring. The SLS indication (parameter
SLSx.15 , SLSx.24 ,
SLSx.34 or SLSx.44 ) goes on.
2 The motor speed goes above the SLS limit positive (B).
3 The motor speed reaches the SLS trip limit positive (A). The SLS indication goes off.
4 After time C has elapsed, the FSO activates the SSE function and the drive starts the
ramp down the motor speed. SAR0 parameter
200.102 defines the ramp.
5 The motor speed goes below the SLS limit positive (B) and the SLS indication goes on.
6 The motor speed goes below the zero speed limit (D). The motor has stopped and the
FSO opens the drive STO circuit. The SSE completed indication goes on.
7 The SLS request is removed. The SLS monitoring is still on (acknowledgement method
is manual or from a safety PLC).
8 The SLS function is acknowledged and the FSO stops the SLS monitoring. The SSE
function is acknowledged with the same acknowledgement. The indications go off.