Hitachi J300U Series User Manual

Page 78

9-5

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

—

Power outage

Check for an overload.

Check whether the thermal
relay is set to an appropriate
value.

Check whether there is a
short or ground fault in the
power supply.

Check whether the MCB
capacity is sufficient.

Check whether the inverter
module or converter module
is defective.

Check for a power outage.

Check whether the MCB or
Mg has a poor contact.

Lower the load ratio.

Set the thermal relay to an
appropriate value.

Remove the short or ground
fault.

Increase the MCB capacity.

Repair the inverter module or
converter module.

Restore the power supply to
normal.

Replace the MCB or Mg.

—

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