ABB ACS880 User Manual page 24

24 Option description
Example 3: SAR1 ramp monitoring and SLS modoff delay time active
In this example, parameter SLSx.05 is set to Monitoring active and modoff delay time. The
time diagram below describes the operation of the SLS function when modulation is lost
during the deceleration ramp.
Motor speed
A
A SAR1 ramp monitoring
B Actual motor speed (coasting after modoff)
C SLS trip limit
D SLS limit
E Last valid speed estimate of FSO
A
E
B
C
D
Time
SLS request
SAR1 monitoring
SLSx.06 Modoff
delay time monitoring
Drive modulation