Issue:
Why do PI testing when replacing a Micrologic trip unit?

Product Line:
Circuit Breakers

Environment:
Powerpact P, R and Masterpact breakers

Resolution:
Primary injection testing is required per instructions, but it does not need to be a full battery of PI tests.  It is acceptable to:

• Inject current on each phase and verify it is metering correctly; this verifies metering chain and that performer plug is connected correctly.
• Also verify through the display that Ir is correct.  Turn Ir dial with screwdriver and ensure the display matches the sensor size to verify that the sensor plug and long time rating plug are connected correctly.
• Then trip the breaker, either by the GF push-to-test button (on 6.0 trip unit only), or pass enough current through one phase to trip the breaker.  This verifies trip solenoid is connected to trip unit.

Released for: Schneider Electric USA