589
6. PROTECTIVE FUNCTIONS
6.5 Check first when you have a trouble
3
4
5
5
5
6
7
8
9
10
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
Check
points
Possible cause Countermeasure 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.
607
Parameter
setting
Pr.71 Applied motor setting is incorrect. Check the Pr.71 Applied motor setting. 351
― Motor current is large. Refer to "6.5.11 Motor current is too large". 591
Check
points
Possible cause Countermeasure 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.
42
Input signal The start signals (forward rotation, reverse
rotation) are connected improperly.
Check the wiring.
(STF: forward rotation, STR: reverse rotation)
50, 550
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. 318
Check
points
Possible cause Countermeasure 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.
73
Parameter
setting
Pr.1 Maximum frequency, Pr.2 Minimum
frequency, Pr.18 High speed maximum
frequency, and Pr.902 to Pr.905 settings are
improper.
Check the settings of Pr.1, Pr.2, and Pr.18. 253
Check the Pr.902 to Pr.905 settings. 328
Pr.31 to Pr.36, Pr.552 (frequency jump)
settings are improper.
Narrow down the range of frequency jump. 255
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. (If Pr.22 is set too high, an overcurrent trip (E.OC[]) is
likely to occur.)
257
Motor Check the capacities of the inverter and the motor. ―
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