Hitachi J300U Series - Manual (Page 77)

9-4
NOTE 1: The failures detectable in the power module are overcurrents, excessively hot main devices, and insufficient
voltages from the gate circuit power supply.
Symptom
Circuit breaker
(MCB)
Electromagnetic contactor
(Mg)
Thermal relay
(THRY)
Failure alarm relay
Display on the
digital operator
(display on the
LCD of the
remote operator)
How to reset
Cause
(explanation
of message)
Check Countermeasure
(NOTE 1)
Failure detected by a
detector in the power
module during motor
acceleration, or
excessive temperature
rise in the inverter
(NOTE 1)
Failure detected by a
detector in the power
module while the motor
was stopping, or
excessive temperature
rise in the inverter
Defective J-FB PC
board
Defective J-FB PC
board
Check whether the speed was
increased rapidly.
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.
Check whether the
installation is vertical and the
wall is a nonflammable wall
such as an iron plate.
Check whether the cooling fan
is running and the ambient
temperature is too high.
Check the internal power
supply.
Check the main devices.
Refer to the manual supplied
with the J-FB PC board.
Refer to the manual supplied
with the J-FB PC board.
Set a longer acceleration
time.
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.
Check the installation.
Replace the cooling fan.
Repair the internal power
supply.
Repair main devices.
A
A
A
A
●
●
●
●
E 3 3
( P M . A c c e l )
E 3 4
( P M . E R R )
E 6 0
( O P 1 0 )
to
E 6 7
( O P 1 7 )
E 7 0
( O P 2 0 )
to
E 7 7
( O P 2 7 )