L2275
Emax UL
21/132
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Mod.
RH0109002
Apparatus
Scale
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9.
Measures to be taken for any operating anomalies
The power supply to the TEST (15 V DC) connection bosses of the PR111-A trip unit does not open the power circuit breaker
Pressing the TEST pushbutton on the PR112-A/PR113-A does not cause power circuit breaker opening
Intervention of the µP Fault signal on the PR112-A/PR113-A trip unit
The WARNING or EMERGENCY LEDs on the PR112-A/PR113-A trip unit light up
Trip unit coils interrupted or burnt out, geared motor winding interrupted
The shunt trip or closing coil does not energize sufficiently
The shunt trip or closing coil remains energized
The moving part does not rack into in the cradle
The moving part does not rack out of the cradle
The power circuit breaker does not close
The power circuit breaker does not open
Checks and remedies
Check and insert connector XO correctly
Replace the YO1shunt trip
Put the power circuit breaker out of service and check the
trip unit with the test apparatus
Intervene according to the cause: in particular, if contact
wear is higher than 80% (WARNING LED lit up) the power
circuit breaker can remain in service, but replacement of the
interrupting parts must be programmed within a short time. If
contact wear reaches 100%, the power circuit breaker must
be put out of service immediately. Ask ABB SACE about
replacement operations of the interrupting parts.
Press the mechanical pushbutton for signaling protection
intervention
Check the state of the contacts in series with the trip unit
circuit
Measure the voltage: it must not be less than 85% of the
rated voltage
Check the rating plate voltage of the trip units
Check connections, fuses, interlock, protection power
circuit breakers and consent contacts
Check tightening of the screws connecting the wires
Check the connections with the relative circuit diagram
Replace the coils
Operate by hand. If the fault persists, consult ABB SACE
Insert and turn the key
Complete the operation
Check the relative power supply circuit
Check the power supply circuit
See paragraph 7.3
Possible causes
Connector XO not inserted correctly
Coil of shunt trip YO1 interrupted
Defect in the electronic circuits of the electronic trip unit
The possible causes of tripping are listed in the part of
the manual relative to the trip units
Protections not reset
Operating mechanism or consent contacts blocked in
closing position
Auxiliary circuit power supply voltage too low
Different power supply voltage than the one indicated on the
rating plate of these trip units
Operating circuit faulty
Wire tightening screws loose
Incorrect electrical connections in the power supply circuit
Trip unit coils interr upted
Operating mechanism blocked
Key not inserted in the operating mechanism key lock
Power circuit breaker in intermediate position between racked-in and
racked-out
Undervoltage release not energized
Shunt trip remains energized
Racking-in or out operation not carried out correctly
Anomalies
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