142 Safety functions
Note: If drive modulation is lost when SLS function is activated and the motor speed
is below SLS limit, SLS indication is on and STO is not activated due to loss of drive
modulation.
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 active 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 reaches 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” (parameter SSE.13), see section SLS trip limit hits on
page 167).
3 The SLS request is removed. The SLS monitoring is still on (acknowledgement method
is manual or from a safety PLC) (parameter SLSx.02, configured as Manual_Safebus).
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
active indication (parameter SLSx.15, SLSx.24, SLSx.34 or SLSx.44) goes off.
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