Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 154)

154 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 2 Feedback and I/O
Fault or Alarm Operation
The reaction to an increased PTC resistance depends on the respective PTC
configuration, such as alarm or fault. When the ATEX module is used, the result
is always fault. When the PTC resistance exceeds 3.2 kOhm a fault or alarm is
triggered. The function is reset when the resistance drops below 2.2 kOhm. A
short circuit is detected when the resistance value drops below 100 Ohm. If the
drive was configured to fault then the fault must be cleared once the PTC
function is reset (value is below threshold).