113
4
TROUBLESHOOTING
Check first when you have a trouble
4.6.3 Inverter generates abnormal noise
4.6.4 Motor generates heat abnormally
4.6.5 Motor rotates in the opposite direction
4.6.6 Speed greatly differs from the setting
Check
points
Possible Cause Countermeasures
Refer
to
page
Fan
Fan cover was not correctly installed when a cooling fan
was replaced.
Install a fan cover correctly. 123
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.
118
Parameter
Setting
The Pr. 71 Applied motor setting is wrong. Check the Pr. 71 Applied motor setting. 82
— Motor current is large. Refer to "4.6.11 Motor current is too large" 115
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
10
Input
signal
The start signals (forward rotation, reverse rotation) are
connected improperly.
Check the wiring. (STF: forward rotation, STR: reverse
rotation)
15
Adjustment by the output frequency is improper during
the reversible operation with Pr. 73 Analog input selection
setting.
Check the setting of Pr. 125, Pr. 126, C2 to C7.
Parameter
Setting
Pr. 40 RUN key rotation direction selection setting is
incorrect.
Check the Pr. 40 setting. 78
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.
75
Check the calibration parameter C2 to C7 settings. 86
Pr. 31 to Pr. 36 (frequency jump) settings are improper. Narrow down the range of frequency jump. 78
Load
Stall prevention function is activated due to a heavy
load.
Reduce the load weight. —
Parameter
Setting
Set Pr. 22 Stall prevention operation level higher according
to the load. (Setting Pr. 22 too large may result in
frequent overcurrent trip (E.OC).)
77
Motor
Check the capacities of the inverter and the motor. —
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