43
PT UNIT USER MANUAL
APRIL 2023 www.eaton.com.cn
Appendix B - Troubleshooting
Symptom
Probable Cause
Possible Solutions
Reference
The LCD display is not energized.
The current flowing through the breaker
is less than the minimum current
requirement for the LCD display, or
there is no auxiliary power (24 Vdc)
connected to the controller.
Apply auxiliary power.
See Section 6.2: Auxiliary Power.
The Status LED indicator is red
continuously or blinking red.
The circuit breaker MCR auxiliary switch
is not indicating proper state.
Check the auxiliary switch.
See the Instructions for Auxiliary Switch.
The circuit breaker mechanism is not
properly closed
Contact your Eaton representative for
factory assistance.
Internal memory problem.
Replace the trip unit.
The circuit breaker is tripping, and
the orange LED indicator (not red) is
illuminated next to SHORT text.
The circuit breaker MCR auxiliary switch
is not indicating proper state.
Check the MCR switch or contact
your Eaton representative for factory
assistance.
See Section 4.8: Making Current Release.
The circuit breaker mechanism is not
closed properly.
Contact your Eaton representative for
factory assistance.
Table B1. Troubleshooting (Continued).