Instruction manual

85
Troubleshooting
ERRORS AND PROTECTIVE FUNCTIONS
6
6.4 Troubleshooting
6.4.1 Motor does not rotate at the commanded speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.4.2 Motor generates abnormal noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
6.4.3 Motor does not rotate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
(1) Vector control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
(2) V/F control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
6.4.4 Motor generates heat abnormally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
6.4.5 Motor hunts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
(1) Speed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
6.4.6 Machine operates unstably . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
(1) Speed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
6.4.7 Speed command does not match motor speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
(1) Speed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
6.4.8 Motor rotates but speed does not change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
(1) Speed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
6.4.9 Torque control is not exercised normally . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
(1) Torque control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
POINT
If the cause is still unknown after every check, it is recommended to initialize the parameters (return to factory
setting) then re-set the required parameter values and check again. (Refer to page 31 for parameter all clear.)
6.4.1 Motor does not rotate at the
commanded speed
It would appear that the motor runs in reverse to the
starting command when the vector control is not exercised
properly due to the inverse rotation direction of the motor
and encoder.
6.4.2 Motor generates abnormal
noise
Motor does not rotate as commanded
Is the Pr. 852 "encoder rotation
direction" setting
correct ?
(Refer to page
Y
Is "REV" lit for the rotation direction on
the control panel during FWD (foward)
rotation?
?
Y
Is the encoder wiring correct ?
(Refer to page
Set "1" in Pr. 852.
N
Perform correct wiring
Is the phase sequence of the
U, V, W correct ?
7.)
13.)
Is the Pr. 72
"PWM frequency selection"
setting correct ?
The motor generates abnormal noise
Y
N
N
Y
Change the Pr. 72
"PWM frequency selection"
to change to an
unoffending noise
Is the gain value too high ?
Check Pr. 820 (Pr. 830)
under speed control
Check Pr. 824 (Pr. 834)
under speed control
Please contact your
sales representative.