Speed hysteresis – Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual User Manual
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Rockwell Automation Publication 750-RM001F-EN-P - February 2012
Chapter 7
Safe Limited Speed (SLS) Modes
Speed Hysteresis
The P56 [Speed Hysteresis] parameter provides hysteresis for the SLS_Out
output when the safety option is configured for SLS Status Only and Safe
Limited Speed monitoring is active. The SLS_Out output is turned ON if the
speed is less than the Low Threshold, which equals [(Speed Hysteresis/100) x
Safe Speed Limit]. The SLS_Out output is turned OFF when the speed is greater
than or equal to the configured P55 [Safe Speed Limit].
The SLS_Out output remains OFF if Safe Limited Speed monitoring begins
when the detected speed is less than the configured Safe Speed Limit but greater
than or equal to the Low Threshold [(Speed Hysteresis/100) x Safe Speed
Limit].
The SLS_Out output is held in its last state when the speed is less than the
configured Safe Speed Limit and the speed is greater than or equal to the Low
Threshold [(Speed Hysteresis/100) x Safe Speed Limit].