4.8 Configuring Function Codes for Drive Controls
4-24
■ Tuning errors (induction motors)
If the tuning result is incorrect, in the worst case scenario, control performance will be adversely affected, possibly
resulting in hunting or accuracy issues. Consequently, if the inverter determines that there is an abnormality in the
tuning sequence or tuning results, “er7” appears, and the tuning data is destroyed.
Listed below are possible causes that trigger tuning errors and measures.
Table 4.8-9
Possible tuning
error causes
Before completion of tuning, a run command has been turned OFF. Or during
tuning, terminal command STOP (“Force to stop”) or BX (“Coast to a stop”) has
been entered.
➔ Do not stop the inverter running until completion of tuning.
During tuning, an excessively large current has flown.
➔ Release a mechanical brake or take any other measure to remove the cause
resulting in overcurrent.
An interphase voltage unbalance or output phase loss has been detected.
Tuning has resulted in an abnormally high or low value of a parameter due to the
output circuit opened.
➔ Check the wiring.
Tuning
frequency error
(only when
P04=2)
The maximum frequency or the frequency limiter (high) has limited the output
frequency.
➔ Increase the F03 and F15 settings to values greater than 50% of the base
frequency 1 (F04).
During tuning, any alarm has occurred.
➔ Check the contents of the multiple alarm and remove the error cause.
“TROUBLESHOOTING.”
Acceleration
time
timeout (only
when P04=2)
The output frequency has not reached 50% of the base frequency within the
specified acceleration time “F07×300%”.
➔ Increase the F07 setting.
For error subcodes, refer to Chapter 3 “3.4.6 Reading alarm information”.
If any of these errors occurs, remove the error cause and perform tuning again, or consult your Fuji Electric
representative.
If a filter other than the Fuji output filter (option) (OFL-□□□-4A) is connected to the inverter's output
(secondary) circuit, the tuning result cannot be assured. When replacing the inverter connected with such
a filter, make a note of the old inverter’s settings for the primary resistance %R1, leakage reactance %X,
no-load current, and rated slip frequency, and specify those values to the new inverter’s function codes.
Vibration that may occur when the motor's coupling is elastic can be regarded as normal vibration due to
the output voltage pattern applied in tuning. The tuning does not always result in an error; however, run
the motor and check its running state.
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