contact wear reaches
100%, the circuit-breaker must put out ofservice immediately.
Ask ABB SACE about replacement procedures for the circuit-
breaking parts
•
Protections not reset Press the mechanical pushbutton forsignalling protection tripping
•
Operating mechanism consent contacts blocked closing
position
Check the state the contacts series with the release circuit
• •
Auxiliary circuit power supply voltage too low Measure the voltage: must not less than 85% the rated
voltage
• •
Different power supply voltage from the one indicated the
rating plate ofthe releases
Check the rating plate voltage the releases
• •
Operating circuit faulty Check connections, fuses, interlocks, protection circuit-breakers
and consent contacts
• Wire tightening screws loose Check tightness the screws connecting the wires
• Incorrect electrical connections the power supply circuit Check the connections with the corresponding circuit diagram
• Release coils interrupted Replace the coils
•
• Operating mechanism blocked Operate hand.
23/158
. Ifthe fault persists contact ABB SACE
• Key not inserted the opening mechanism lock Insert and turn the key
•
Circuit-breaker intermediate position between connected
and disconnected Complete the operation
• Undervoltage release not energized Check the corresponding power supply circuit
• Shunt opening release remains energized Check the power supply circuit
• Racking-in out operation not carried out correctly See paragraph 7.3
Model 2234 Apparatus Scale
L 2778
Doc-Na 1SDH000460R0002
Page No.Measures taken for any operating anomalies
P ressing i-Test tto 122/P 123 circ it-b g
Anom alies
T ALA led 121/PR 122/PR 123 release lig up
R elease ils rru rru d
The release sin release ize fficie tly
The release sin release rem ize d
T oving rack into fixe part
The oving rack fixe part
T ircu it-b clo se
T circu it-b pen
P ssib cks and s
•
•
Connector not inserted correctly
Coil ofthe opening release YO1 interrupted
Check and insert connector correctly
Replace the YO1 shunt opening release
•
Defect the electronic circuits the microprocessor
release
Put the circuit-breaker out service and check the release
with the test apparatus
The possible causes tripping are listed the part the
manual relating the releases
Take action according the cause: particular, ifcontact wear
is higher than 80% (WARNING led lit up), the circuit-breaker can
remain service, but replacement the circuit-breaking parts
must scheduled within short time
