Sls With Speed Below Monitored Speed - ABB FSO-21 User Manual

128 Safety functions
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SLS with speed below monitored speed

This applies to both time and ramp monitoring.
Motor speed
B
1
A SLS trip limit positive (parameter SLSx.14, SLSx.23,
B SLS limit positive (parameter 200.23, 200.33,
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. The drive limits the motor speed so that it does not go
above the SLS limit positive.
2 If the motor speed goes above the SLS trip limit positive (A), the FSO activates the
SSE function and the motor coasts to a stop (in this case, the SSE function has been
configured as "Immediate STO", see section
3 The SLS request is removed. The SLS monitoring is still on (acknowledgement method
is manual or from a safety PLC).
Note: If automatic acknowledgement is used, the SLS monitoring is also ended.
4 The SLS function is acknowledged and the FSO stops the SLS monitoring. The SLS
indication (parameter SLSx.15, SLSx.24,
- -> Safe stop emergency (SSE)
A
2
SLSx.34
3 4
SLSx.33 or SLSx.43)
200.43 or 200.53)
SLS trip limit hits on page 133).
or SLSx.44) goes off.
Time
SLS request
SLS state &
indication