Sls With Speed Above The Monitored Speed - Time Monitoring - ABB ACS880-07 User Manual

3. The user or a PLC deactivates the SLS request of the FSO module, that is, switches
the digital input of the FSO module from 0 to 1. The FSO module acknowledges the
SLS1 function automatically. This is set to be automatic by an FSO parameter (SLSx.02),
and no external acknowledgement input is in use. The FSO module stops SLS monitoring
and de-energizes the SLS indication signal.
(3b) The motor speed goes below the zero speed limit (D). If the FSO module activated
the SSE function at 2b, the STO acknowledgement becomes allowed now. The user
must reset the drive if the STO indication parameter (FSOGEN.62 or 31.22) has been
set so that a fault is generated. See chapter General parameters.

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 SLSx.04
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 activates the SLS request of the FSO module, that is, switches the
digital inputs of the FSO module from 1 to 0. The FSO module starts a counter for time
(B).
2. (From (2) to (3)) After the safety function response time (A), the drive starts to decelerate
the motor speed according to drive ramp parameters. 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.
3. The actual motor speed reaches the SLS1 limit positive.
(From (3) to (4)) The drive limits the motor speed reference so that the motor speed
stays at or below the SLS1 limit positive. The FSO module monitors the actual motor
speed. If the motor speed still goes above the SLS1 trip limit positive (D), the FSO
module activates the SSE function (see section SLS with speed below the monitored
speed).
D
3 3b
Option description 19
Time
5
4
SLS request
SLS status &
indication