Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 191)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 191
Diagnostics and Protection Chapter 3
to issue the actual fault at a higher current level or a slightly longer Shear Pin
time.
Other Points
The Shear Pin feature is not to be taken as a precise current reactionary feature.
There can be as much as +/- 5% error in the current feedback signal used to
determine shear point levels. Therefore it could be possible that the timer trip
point is being set and reset until the entire current reference is above a setpoint.
Shear Pin - Alarm then Fault
P7 [Output Current] P436 [Shear Pin1 Level] P439 [Shear Pin2 Level]
Motor Speed
Shear Pin 1
Time
Load Changes
Drive Faults
P952 [Fault Status A] P959 [Alarm Status A] P3 [Mtr Vel Fdbk]
Shear Pin 2 Time
Alarm
Indication Alarm
Indication
Fault
Indication