Mitsubishi Electric MS-T Series, Instruction Manual

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28
Trouble State Cause Measures
The shading coil has a breakage (life). Replace the entire unit.
Incorrect mounting or distortion of
mounting surface.
Change to correct mounting.
The coil voltage is incorrect. (Low
voltage) Replace with the entire unit having the
correct coil rating.
The core is worn. (The life is up.) Replace the entire unit.
Resonance during panel mounting. Change the mounting structure.
The sound
is always
heard.
Mechanical interlock
Readjust or replace the mechanical
interlock.
A large current is flowing.
Measure the current and remove the
cause.
A beating
sound is
heard.
Sound is
heard at
main
circuit
section.
The wiring in the enclosure has been
separated. Pass the input and output wiring through
the same hole when wiring.
The load is large. Use a correct load.
The switching frequency is too high. Re-select according to the frequency.
The vibration and impact during use is
large.
Change the mounting method or place.
The relay scale setting is incorrect. Set to the correct scale.
Trips
frequently.
The relay current capacity selection is
incorrect.
Replace with the correct current capacity.
The starting time is long. (10 s or more)
The starting current is large.
Re-select the relay, or mount a saturable
reactor.
The application is incorrect.
( -
 , pole number change, etc.)
Re-select for the correct application.
The ambient temperature has risen.
Compensate for the temperature, or
change the mounting position.
The
thermal
overload
relay trip.
Occurs
when
starting.
The load is inconsistent. Correct the load or re-select the motor.
The relay capacity selection is
incorrect.
Re-select the correct rating.
The relay scale setting is incorrect. Set correctly.
The relay is damaged. Replace the relay.
The motor has a special structure.
Replace with a special thermal overload
relay.
The reset bar is being pressed by
something.
Remove the obstruction.
The resetting is repeated in a short
time.
Review the motor capacity.
Contact welding (short circuit in the
circuit).
Replace the relay.
Fault in the magnetic contactor. Replace the magnetic contactor.
–
The wiring is incorrect or faulty. Repair the faulty section.
A short circuit current flowed.
Replace the relay and improve the
protection balance.
The
thermal
overload
relay does
not
function.
Heater
fused
The wiring is incorrect or faulty.
Replace the relay and repair the faulty
section.
The relay is reset too early. Wait for the relay to cool before resetting.
The contacting of the contact is faulty. Replace the relay.
The
thermal
overload
relay
cannot be
reset.
–
The wiring is faulty. Repair the faulty section.