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Display
Alarm code
condition
(as displayed)
Blinking
Steady
Steady
Steady
Blinking
Steady
Meaning of
alarm
The inverter's
internal voltage
Low voltage
dropped below the
allowable level.
• The built-in
thermal
protector of the
motor actuated.
Overheated
• Missing phase
∗2
motor
in the wiring
between the
motor and
inverter
Error in the CPU
or other built-in
∗3
Circuit error
component of the
inverter
The inverter's
output current
remained above
Overload
approx. 150% of
the rated output
current for 1 min.
The output
selector switch or
gear-ratio setting
Setting error
switches is/are set
to a value outside
the applicable
setting range.
The output side of
the inverter was
shorted to the
Ground
ground and ground
∗4
fault
fault current flowed
into the inverter as
a result.
10 Troubleshooting and remedial actions
Description
• Check if the power supply
• In the case of a
• Reduce the load.
• Increase the acceleration
• Lower the ambient
• Check the motor
If the alarm persists after
inputting an alarm reset
signal, turn off, and then on
the power.
• Reduce the load.
• Increase the acceleration
• Set the motor output
• Check if the output
• Set a code appropriate for
Check the wiring between
the inverter and motor to
look for any part that is
shorted to the ground.
Remedial action
voltage is within the
specification range.
three-phase input inverter,
check if any of the three
power phases is missing
or a single-phase power
supply is connected.
/deceleration time.
temperature of the motor.
connection.
/deceleration time.
selector switch to an
appropriate output level.
selector switch is set to
the correct output of the
motor used with the
inverter.
the gear ratio of the
gearhead (87, 88 and 89
on the gear-ratio setting
switches are invalid).
∗5
– 55 –
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