Fuji Electric FRENIC-MEGA, Instruction Manual

Page: 111 / 358

4-12
Ch
ap. 4
RUNNING TH
E
MOT
O
R
„
Tuning errors
Improper tuning would negatively affect the operation performance and, in the worst case, could even cause hunting or deteriorate
precision. Therefore, if the inverter finds any abnormality in the tuning results or any error in the tuning process, it displays
er7
and discards the tuning data.
Listed below are possible causes that trigger tuning errors.
Possible tuning error causes Details
Error in tuning results
- 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.
Output current error An abnormally high current has flown during tuning.
Sequence error
During tuning, a run command has been turned OFF, or
STOP
(Force to stop),
BX
(Coast to a
stop),
DWP
(Protect from dew condensation), or other similar terminal command has been
received.
Error due to limitation
- During tuning, any of the operation limiters has been activated.
- The maximum frequency or the frequency limiter (high) has limited tuning operation.
Other errors An undervoltage or any other alarm has occurred.
If any of these errors occurs, remove the error cause and perform tuning again, or consult your Fuji Electric representative.
Do not execute motor tuning with output filter unless the filter is a reactor type only. A tuning error may result if any other
type filter is in use.
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.