I.B. 29C891B
Page 43
Effective 11/98
SECTION 5: TROUBLESHOOTING AND
MAINTENANCE
5-1 LEVEL OF REPAIR
This manual is written based on the assumption that
only unit-level troubleshooting will be performed. If the
cause of a malfunction is traced to a Digitrip OPTIM Trip
Unit, the device should be replaced. The malfunctioning
device may be returned to Cutler-Hammer for further
evaluation.
5-2 TROUBLESHOOTING
OPTIM Trip Units can be used with or without auxiliary
power. In addition, guidelines can vary to some degree
by circuit breaker type. To make the guidelines of Table
5.1 as user friendly as possible, the troubleshooting
table is divided by circuit breaker type, with and without
auxiliary power.
5-3 TRIP UNIT REPLACEMENT
If a trip unit or a circuit breaker must be replaced, con-
sult Cutler-Hammer for specific replacement instruc-
tions.
5-4 MAINTENANCE AND CARE
Except for the rating plug and the battery for the local
indicator, the Digitrip OPTIM Trip Unit is designed to be
a self contained and maintenance free device.
The Digitrip OPTIM Trip Unit should be stored in an
environment that does not exceed the temperature
range of -30° to +85°C. The environment should also be
free of excess humidity. Store the device in its original
packing material.
K, L and N-Frame Circuit Breakers with Auxiliary Power
Unit Status LED is not Auxiliary power is not present or is Measure voltage at +30VDC and NEG on side Table A.1
blinking at approximately reversed. terminal block to be 30 ± 3 volts. Check polarity. Wiring Diagrams
a one second on-off duty
cycle. Open connection on breaker Check orange and black wires on the side term- Table A.1
internal wiring. inal block. Wiring Diagrams
Trip unit may be the problem. Replace breaker. Refer to Note 1 at end of Para. 5-3
Table 5.1
As soon as auxiliary power Rating plug is not installed or pins Install rating plug and/or check connections. Para. 2-6 & 5-4.2
is applied, instantaneous are not making good connection.
trip LED comes on and
breaker trips if initially Rating plug is open internally Replace rating plug Para. 5-4.2, Table 2.1
closed.
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
Table 5.1 Troubleshooting Guide (continued on next page)
Symptom Probable Cause Possible Solution(s) References
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