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206
Check first when you have a trouble
6.5.4 Motor generates heat abnormally
6.5.5 Motor rotates in the opposite direction
6.5.6 Speed greatly differs from the setting
6.5.7 Acceleration/deceleration is not smooth
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.
213
Parameter
Setting
The Pr. 71 Applied motor setting is wrong. Check the Pr. 71 Applied motor setting.
125
— Motor current is large. Refer to "6.5.11 Motor current is too large" 208
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
15
Parameter
Setting
Pr. 40 RUN key rotation direction selection setting is
incorrect.
Check the Pr. 40 setting.
182
Check
points
Possible Cause Countermeasures
Refer
to
page
Parameter
Setting
Pr. 1, Pr. 2, Pr. 18 settings are improper.
Check the settings of Pr. 1 Maximum frequency, Pr. 2
Minimum frequency, Pr. 18 High speed maximum frequency.
105
Pr. 31 to Pr. 36 (frequency jump) settings are improper. Narrow down the range of frequency jump.
106
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).)
101
Motor
Check the capacities of the inverter and the motor. —
Check
points
Possible Cause Countermeasures
Refer
to
page
Parameter
Setting
The base frequency does not match the motor
characteristics.
For V/F control, set Pr. 3 Base frequency and Pr. 47 Second
V/F (base frequency).
107
For Advanced magnetic flux vector control or General-
purpose magnetic flux vector control, set Pr. 84 Rated
motor frequency.
127
Stall prevention function is activated due to a heavy
load.
Reduce the load weight. —
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).)
101
Check the capacities of the inverter and the motor. —
Acceleration/deceleration time is too short. Increase acceleration/deceleration time.
116
Torque boost (Pr. 0, Pr. 46) setting is improper under V/F
control, so the stall prevention function is activated.
Increase/decrease Pr. 0 Torque boost setting value by
0.5% increments to the setting.
94
Regeneration avoidance operation is performed
If the frequency becomes unstable during regeneration
avoidance operation, decrease the setting of Pr. 886
Regeneration avoidance voltage gain.
174