Mitsubishi Electronics FR-V500 Troubleshooting Motor hunts, Speed control, Being made?

Troubleshooting

6.4.4Motor hunts

(1) Speed control

The motor hunts.

Is the speed setting varying?

N

PLG has not been set.

N

Is the speed gain too high compared to the machine?

N

Y

Take proper action to stabilize the speed setting.

(Example: Enter the filter time constant (Pr. 822) to the analog terminal.)

Y

Perform PLG setting

(Refer to page 12 for details.)

Y

Perform easy gain tuning (Pr. 819 = 1 (load estimation, gain estimation), 2

(gain estimation)).

However, gain estimation and load estimation may not be made well depending on the machine and operational specifications.

(For details, refer to page 43.)

Is there load variation?

N

Y

Choose model adaptive speed control. (Pr. 877) <Refer to the Instruction Manual (detailed).> Alternatively, if load variation is large, the motor speed also varies. Increasing the response of speed control decreases speed variation.

	Is torque restriction	Y
	being made?
		Increase the torque restriction
	N	level.
		Lighten the load.
Please contact your sales
representative.

87