Technical FAQs

Ask a Question

Micrologic Trip Unit Temporarily Loses Communications After Tripping

Issue
Micrologic Trip Unit Temporarily Loses Communications After Tripping

Product Line
Powerpact P and R, Compact NS, and Masterpact NT and NW, Micrologic Trip Unit (see table for designations).

Trip Unit Trip Function Type
2.0A (IEC Only) LSO Standard
3.0A LI
5.0A LSI
6.0A LSIG
5.0P LSI Power
6.0P LSIG
5.0H LSI Harmonics
6.0H LSIG


Environment
Application using breaker communication.

Cause
The Micrologic trip unit is designed so that when it trips the circuit breaker, it communicates the cause of trip to the Breaker Communications Module (BCM) and then temporarily breaks communications to the BCM. It takes up to three seconds for communication to be restored between the trip unit and the BCM. During this time, if there are any communication requests from the supervisory software, a communication loss might be observed.

Resolution
After this communication break, the trip unit automatically restores communications to the BCM. See the below link or attached document for the data bulletin regarding this behavior.

Micrologic Trip Unit: Communication After Tripping 0600DB1304

 
Was this helpful?
What can we do to improve the information ?