152 Safety functions
Step Description
1 The SLS request is received. The motor speed is above the SLS trip limit positive (A).
The drive starts to ramp down the motor speed. The SAR1 parameter 200.112 defines
the deceleration ramp slope until the speed reaches the SLS limit. The FSO starts the
SAR1 ramp monitoring (parameters SARx.21, SARx.22). SAR1 configuration defines
the target and monitoring limits for the deceleration ramp (SARx.22, 200.112,
SARx.02).
Note: If parameter 200.112 has value 0, the drive (drive parameter 23.23) defines the
ramp.
2 The drive trips on a fault, there is a drive power loss, or user stops the drive by coast
stop. SAR1 monitoring of the FSO is on (parameter SLSx.05 configured as Monitoring
active). As the modulation is lost, FSO's safe speed estimation is stopped and it starts
to use the last speed information that it had before the modulation was lost. With
SLSx.06 Monitor active, SAR1 monitoring stays active also when the modulation is lost
from the drive.
STO.14 delay starts.
3 Modulation of the drive has not returned and the safe speed estimation with the last
valid speed information hits the SAR1 monitoring and FSO activates STO function and
STO indication (parameter STO.21 STO output). See section Safe torque off (STO) on
page 67 for more information on how to configure the STO function.
If the modulation returns before the last valid speed estimation of FSO hits the SAR1
monitoring limit, the drive will continue the deceleration for as long as the speed stays
within the SAR1 ramp monitoring limits.
4 SLS indication goes on after STO.14 delay has elapsed.
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