8 Fault Diagnosis
211
Errors Occurring during Autotuning
Indication Meaning Cause Corrective Action
E02 Alarm An alarm (XXX) was detected dur-
ing tuning.
• Check input data.
• Check wiring and the machine
environment.
• Check the load.
E03 STOP key input The STOP key was pressed dur-
ing tuning and tuning was can-
celled.
−
E04 Resistance
error
• Tuning was not completed in
the specified time.
• Tuning results were outside
the setting range for constants.
• Check input data.
• Check motor wiring.
• Disconnect the motor from the
machine system if connected
during rotational autotuning.
• Change the Maximum Voltage
if the Maximum Voltage is
higher than the Inverter input
power supply voltage.
E05 No-load current
error
E09 Acceleration
error
The motor did not accelerate in the
specified time.
• Increase Acceleration Time 1
(n019).
• If Stall Prevention Level during
Acceleration (n093) has been
lowered, return it to the initial
value.
• Disconnect the motor from the
machine system, if connected.
E12 Current
detection error
• Current flow exceeded motor
rated current.
• The sign of the detected cur-
rent was reversed.
• At least one of phases U, V,
and W is open.
Check the current detection circuit,
motor wiring, and current detector
installation.
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