L3692
Tmax T8
20/39
Doc N°
Mod.
Apparatus
Scale
Page N°
1SDH000682R0002
L3885
L5757
9. Measures to be taken if operating faults occur
The circuit-breaker fails to open when the opening pushbutton is pressed
Faults
The circuit-breaker fails to open because service release YO has tripped
The circuit-breaker fails to open because undervoltage release YU has tripped
The circuit-breaker fails to open when the protection relay release test is performed
The circuit-breaker fails to close when the closing pushbutton is pressed
The circuit-breaker fails to close because closing coil YC has tripped
The closing springs cannot be loaded with the manual loading lever
The closing springs cannot be loaded with the spring-loading motor
The circuit-breaker cannot be locked in the open position
Possible causes
Checks and solutions
•
The opening solenoid of the relay is not
connected properly
Make sure that the opening solenoid is con-
nected correctly
•••
Relay tripping signal not reset
Press the mechanical pushbutton to reset the
relay tripping signal
••
Supply votage of the auxiliary circuits too
low
Measure the voltage: it must not be less than
85% of the rated voltage of the coil
••
Supply voltage different from the value indi-
cated on the nameplate of these releases
Check the voltage indicated on the nameplate of
the releases
•
Faulty switching circuit
Check the connections, fuses, interlocks, protec-
tion switches and accept contacts
•••
Loose clamping screws of the wires and
auxiliary circuits
Make sure that the wire clamping screws are
tight
•••
Incorrect electrical connections in the
power supply circuit
Check the connections with the relative func-
tional diagram
••
Coil damaged Replace the coil
••
Operating mechanism locked
Operate in the manual mode. Contact ABB SACE
if the fault persists
••
Open position key lock activated Unlock by inserting the key
••
Undervoltage release not energized
Check the relative supply circuit and the supply
voltage
••
Shunt opening release remains perma-
nently energized
Check the supply circuit
•• •
Operating mechanism locked Call ABB SACE
•
The fuse that protects the spring loading
motor protection has tripped
Replace the fuse
•
Faulty gearmotor for automatic spring
loading
Replace the gearmotor
•
Circuit-breaker closed
Press the opening pushbutton and activate the
lock
•
Lock in open position defective Call ABB SACE
WARNING: If the fault or failure of the circuit-breaker in your application could cause injuries, material damage
or is highly critical, the circuit-breaker itself must be immediately removed so that it can be inspected or repaired.
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