Safety functions 167
SLS trip limit hits
If the motor speed exceeds an SLS trip limit, the FSO activates the SSE function. The
operation of SLS and SSE indications in SLS trip limit hit situations are described in
the diagrams and tables below. For more information on the SSE function, see
section Safe stop emergency (SSE) on page 106.
SSE with immediate STO, with a safe speed estimate
This applies when the SSE function has been configured as “Immediate STO”.
A SLS trip limit positive (parameter SLSx.14, SLSx.23, SLSx.33 or SLSx.43)
B SLS limit positive (parameter 200.23, 200.33, 200.43 or 200.53)
C Response time (depends on system configuration, see page 532)
D Time to zero speed (parameter STO.14)
SLS trip limit (A)
SLS indication
SLS request
Motor speed
Time
A
7
1
6
B
4
3
D
STO.14
C
SSE state &
indication
5
SSE completed
indication
2
- -> Safe stop emergency (SSE)
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