I.B. 29C891B
Page 46
Effective 11/98
Trip unit may be the problem. Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1.
Zone selective interlocking
on ground fault and/or See directions for checking zone selective interlocking Appendix B
short delay does not work.
Communication over No auxiliary power Check that the Unit Status LED is blinking. If not, Symptom: “Unit
IMPACC is not working. see first symptom in this table. Status LED is not
(Direct with BIM not involved) blinking.”
Open INCOM connection Check INCOM connections on side terminal Table A.1
block. The transmit LED should flash when there Wiring Diagrams
is communication. With INCOM connector un-
plugged, the resistance “looking into” the INCOM
terminals should be approximately 2.5 ohms.
Trip unit may be the problem. Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1.
K, L and N-Frame Circuit Breakers without Auxiliary Power
Unit Status LED is not Current thru breaker is < 20% of No problem. Status LED will not operate with N.A.
blinking at approxi- frame rating. breaker currents < 20% of frame rating.
mately a one second
on-off duty cycle Trip unit may be the problem Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1.
As soon as current starts Rating plug is not installed or is Install rating plug and/or check for loose Para 2-6 & 5-4.2
to flow thru the breaker, loose. connections.
it trips and the instantan-
eous trip LED comes on. Rating plug is open internally Replace rating plug Para. 5-4.2, Table 2.1
Trip unit may be the problem. Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1.
LED does not come on Battery installed backwards Install correctly Para. 5-4.1
when battery check
button is pressed. Dead battery Replace battery Para. 5-4.1, Table 2.2
Trip unit may be the problem Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1.
Power values are grossly Connections from PT Module to Check connections Table A.1
in error (1050 trip units breaker not made or are incorrect. Wiring Diagrams
only).
Frequency incorrect Verify operating frequency with OPTIMizer I.B. 29C892, Para 3-6
Trip unit may be the problem. Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1.
Table 5.1 Troubleshooting Guide (continued from previous page)
Symptom Probable Cause Possible Solution(s) References
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