Troubleshooting; Error Messages And Diagnosis; How To Reset - Hitachi J300 Series Instruction Manual

9. TROUBLESHOOTING

9.1

Error Messages and Diagnosis

When the inverter goes wrong, it operates as indicated below. Find the cause and take
contermeasures.
Symptom
Display on the
digital operator
remote operator)
( O C . D r i v e )
( O C . D e c e l )
( O C . A c c e l )
NOTE 1: How to reset
A: Stop the inverter. Then, connect the <RS> and <CM1> control terminals or press the STOP/RESET key on
the operator.
B: Opeate the circuit breaker and electromagnetic contactor (turn the power on again).
C: Stop the inverter. Then, reset the thermal relay.
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Error Messages and Diagnosis
(display on the
LCD of the
Overcurrent detected
E 0 1
by the AC CT while
the motor was running
at a constant speed
(overcurrent during
operation)
Overcurrent detected
E 0 2
by the AC CT during
motor deceleration
(overcurrent during
deceleration)
Overcurrent detected
E 0 3
by the AC CT during
motor acceleration
(overcurrent during
acceleration)
Overloaded inverter
E 0 5
(operation under an
( O v e r . L )
overload)
Cause
(explanation
of message)
A Check whether a load was
changed rapidly.
Check whether there is a
shorted output or ground
fault.
A Check whether the speed
was decreased rapidly.
Check whether there is a
shorted output or ground
fault.
A Check whether a load was
changed rapidly.
Check whether there is a
shorted output or ground
fault.
Check whether the start
frequency is too high.
Check whether the torque
boost is too high.
Check whether the motor is
locked.
A Check for an overload.
Check whether the
electronic thermal level is
correct. (Check whether the
level has been changed.)
9-1
Check Countermeasure
Do not change loads
rapidly.
Check whether the output
lines or motor is shorted.
Set a longer deceleration
time.
Check whether the output
lines or motor is shorted.
Do not change loads
rapidly.
Check whether the output
lines or motor is shorted.
Lower the start frequency.
Lower the torque boost.
Check the motor or loads.
Lower the load ratio.
Set an appropriate level.