ABB ACS880-17 - Safety Data and Block Diagrams

Example 4: Time monitoring active
In this example, parameter SLSx.05 is set to Monitoring active. The time diagram below
describes the operation of the SLS function when modulation is lost during the deceleration
ramp.
SLS indication
Motor speed
Time
B
E
STO active
Drive modulation
SLS request
SLSx.04 time
delay monitoring
C
D
STO.14 delay
Actual motor speed (coasting after modoff)B
SLS trip limitC
SLS limitD
Last valid speed estimate of FSOE
Option description 27