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.
