Troubleshooting; Motor Does Not Rotate At The Commanded Speed; Motor Generates Abnormal Noise - Mitsubishi Electric FR-V500 Series Instruction Manual

6.4 Troubleshooting

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
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.
Motor does not rotate as commanded
Is the Pr. 852 "encoder rotation
direction" setting correct ?
13.)
(Refer to page
Y
Is the encoder wiring correct ?
7.)
(Refer to page
Is the phase sequence of the
U, V, W correct ?
N
Perform correct wiring
?
Is "REV" lit for the rotation direction on
the control panel during FWD (foward)
rotation?
Y
Set "1" in Pr. 852.
85
6.4.2 Motor generates abnormal
noise
The motor generates abnormal noise
Is the Pr. 72
"PWM frequency selection"
setting correct ?
Y
Is the gain value too high ?
N
Please contact your
sales representative.
Troubleshooting
N
Change the Pr. 72
"PWM frequency selection"
to change to an
unoffending noise
Y
Check Pr. 820 (Pr. 830)
under speed control
Check Pr. 824 (Pr. 834)
under speed control
6