144 Safety functions
Step Description
1 The SLS request is received. The motor speed is above the SLS trip limit positive (A).
The FSO starts the counter for the SLS time delay (C) (parameter SLSx.04).
2 The drive starts to ramp down the motor speed. The drive (parameter 23.13 or 23.15)
defines the deceleration ramp until the speed reaches the SLS limit positive (B).
The FSO starts the SLS monitoring when the motor speed is in the middle of the SLS
limit and the SLS trip limit (see also section How to configure mute time for monitoring
start on page 399). The SLS active indication (parameter SLSx.15, SLSx.24, SLSx.34
or SLSx.44) goes on.
3 The motor speed reaches the SLS limit positive (B).
3-6 The drive limits the motor speed, but if the motor speed still reaches the SLS trip limit
positive, the FSO activates the SSE function. See section SLS trip limit hits on
page 167.
4 The FSO starts the SLS monitoring at the latest here, that is, after the SLS time delay
(C) has elapsed.
Note: If the motor speed is above the SLS trip limit after the SLS time delay (C) has
elapsed, the FSO module activates the SSE function. For more information, see
section SLS trip limit hits on page 167.
5 The SLS request is removed, but 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.
6 The SLS function is acknowledged and FSO stops the SLS monitoring. The SLS active
indication (parameter SLSx.15, SLSx.24, SLSx.34 or SLSx.44) goes off.
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