Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual - Manual (Page 77)

Rockwell Automation Publication 750-RM001F-EN-P - February 2012 77
Safe Limited Speed (SLS) Modes Chapter 7
Safe Limited Speed Reset
A Safe Limited Speed (SLS) Reset is a transition out of actively monitoring safe
limited speed. It can also occur during a P53 [LimSpd Mon Delay], if one is
configured. When an SLS Reset occurs, the safety option no longer monitors for
safe limited speed and the door is locked. Speed is no longer restricted to the
configured Safe Speed Limit.
The SLS Reset function monitors the SLS_In input. If an SLS Reset is requested,
the safety option checks that no faults are present and verifies that the SLS_In
input is ON (closed circuit) before the reset is performed.
When the input is OFF, Safe Limited Speed monitoring takes place, after the P53
[LimSpd Mon Delay], if one is configured. An SLS Reset can be requested during
active Safe Limited Speed monitoring or during a Safe Limited Speed
Monitoring Delay. If a reset is requested during a Safe Limited Speed Monitoring
Delay, the reset does not wait for the delay to time out.
Automatic
Once the SLS_In input is ON (closed), the safety option lets the drive resume
normal operating speed. No reset button is required to re-enter the normal run
state.
Manual
When the SLS_In input transitions from OFF to ON and the Reset_In input is
ON, an SLS_Reset is attempted.
If the SLS_In transitions from OFF to ON and the Reset_In input is OFF, the
safety option stays in its current state, whether it is actively monitoring Safe
Limited Speed or is in a Safe Limited Speed Monitoring Delay, and waits for the
Reset_In input to transition to ON, before attempting the SLS_Reset. If at any
time, the SLS_In input transitions back to OFF, the SLS_Reset is aborted.
Manual Monitored
When the SLS_In input transitions from OFF to ON, the safety option waits for
an OFF to ON to OFF transition of the Reset_In input before an SLS_Reset is
attempted. If at any time during this period, the SLS_In input transitions back to
OFF, the SLS_Reset is aborted.