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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
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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.
C
B
B
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