Safety functions 149
SLS reaction if modulation is lost with Modoff delay time - modulation returns
before modoff delay
The operation of the SLS function in case of the modulation of the drive is lost during
the deceleration ramp and the modulation returns before the Modoff delay time has
run out with Modoff delay time selected (parameter SLSx.05 is set to Modoff delay
time) is described in the time diagram and table below.
A SAR1 ramp monitoring
B Actual motor speed (coasting after modoff)
C SLS trip limit
DSLS limit
Motor speed
Time
1 4
3
2 5
A
A
Drive modulation
SLS request
SAR1 monitoring
SLSx.06 Modoff
delay time monitoring
SLS monitoring
SLS indication
B
C
D
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