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165
Check first when you have a trouble
5
TROUBLESHOOTING
5.6.4 Motor generates heat abnormally
5.6.5 Motor rotates in the opposite direction
5.6.6 Speed greatly differs from the setting
Check
points
Possible Cause Countermeasures
Refer
to
page
Motor
Motor fan is not working
(Dust is accumulated.)
Clean the motor fan.
Improve the environment.
—
Phase to phase insulation of the motor is insufficient. Check the insulation of the motor. —
Main
Circuit
The inverter output voltage (U, V, W) are
unbalanced.
Check the output voltage of the inverter.
Check the insulation of the motor.
171
Parameter
Setting
The Pr. 71 Applied motor setting is wrong. Check the Pr. 71 Applied motor setting. 113
— Motor current is large. Refer to "5.6.8 Motor current is too large" 166
Check
points
Possible Cause Countermeasures
Refer
to
page
Main
Circuit
Phase sequence of output terminals U, V and W is
incorrect.
Connect phase sequence of the output cables
(terminal U, V, W) to the motor correctly.
13
Input
signal
The start signals (forward rotation, reverse rotation)
are connected improperly.
Check the wiring. (STF: forward rotation , STR:
reverse rotation)
20
The polarity of the frequency command is negative
during the polarity reversible operation set by Pr. 73
Analog input selection.
Check the polarity of the frequency command.
Input
signal
Parameter
setting
Torque command is negative during torque control
under vector control.
Check the torque command value.
Check
points
Possible Cause Countermeasures
Refer
to
page
Input
signal
Frequency setting signal is incorrectly input. Measure the input signal level. —
The input signal lines are affected by external EMI.
Take countermeasures against EMI such as using
shielded wires for input signal lines.
Parameter
Setting
Pr. 1, Pr. 2, Pr. 18,calibration parameter C2 to C7
settings are improper.
Check the settings of Pr. 1 Maximum frequency, Pr. 2
Minimum frequency, Pr. 18 High speed maximum
frequency.
103
Check the calibration parameter C2 to C7 settings. 119
Pr. 31 to Pr. 36 (frequency jump) settings are improper. Narrow down the range of frequency jump. 108
Load
Stall prevention (torque limit) function is activated
due to a heavy load.
Reduce the load weight. —
Parameter
Setting
Set Pr. 22 Stall prevention operation level (Torque limit
level) higher according to the load. (Setting Pr. 22 too
large may result in frequent overcurrent trip
(E.OC).)
106
(107)
Motor Check the capacities of the inverter and the motor. —