User Manual

DIR 1000682R0002 (L5757)
(17)
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 opening coil has tripped
The circuit-breaker fails to open because undervoltage release undervoltage 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 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 AB 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 Rocwell Automation
•
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 AB
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.