Sls With Speed Above The Monitored Speed - Time Monitoring - ABB ACS880 Series Manual

20 Option description

SLS with speed above the monitored speed - time monitoring

This time scheme diagram illustrates the operation of the SLS function with time monitoring.
The motor speed is above the monitored speed when the SLS function is activated.
Motor speed
B
A
C
1 2
A Safety function response time
B SLS time delay (parameter SLSx.04): When time B has elapsed from the start of the counter
(step 1 below), the FSO module starts SLS monitoring (if not already started).
C SLS1 limit positive (parameter 200.23)
D SLS1 trip limit positive (parameter SLSx.14)
1. The user or a PLC de-energizes the applicable digital inputs of the FSO module. This
activates the SLS request. The FSO module starts a counter for time (B).
2. After the safety function response time (A), the drive starts to decelerate the motor
according to the user-defined deceleration ramp. The FSO module starts SLS monitoring
and energizes the digital output that indicates the SLS status when the motor speed is
in the middle of the SLS1 trip limit and the SLS1 limit.
SLSx.04
3 3b
D
4
Time
5
SLS request
SLS status &
indication