CHAPTER 7 MAINTENANCE AND INSPECTION

18. Deviation Overflow

[Display]

oF

[Description of detected alarm]

A position deviation amount equivalent to servomotor

revolutions specified in PA2_69 (deviation detection overflow

value) is accumulated inside the servo amplifier.

[Cause and remedy]

Cause

Remedy

Wrong connection of power cables

(The alarm is alerted immediately when

servo-on is turned on.)

Check and correct the wiring of power cables (U, V

and W).

The servomotor fails to rotate mechanically. Check if the brake is applied.

Low output torque

Increase PA1_27, _28 (torque limit).

The deviation detection width is small.

Increase PA2_69 (deviation detection overflow

value).

The amplifier is in the P control mode.

Turn off the P motion signal.

Low gain

Perform gain adjustment.

Acceleration/deceleration of pulse frequency

is too acute.

Increase the acceleration/deceleration time.

7

The default setting of PA2_69 (deviation detection overflow value) is 15 rev, that is, 20 bits x 15

pulses. During regular servo system operation, the deviation amount increases in proportion to the

rotation speed.

19. Amplifier Overheat

[Display]

AH

[Description of detected alarm]

The temperature of the servo amplifier has exceeded the

allowable limit.

[Cause and remedy]

Cause

The ambient temperature exceeds

55°C.

Remedy

Reduce the ambient temperature to 55°C or lower. (40°C

or lower temperatures are recommended for regular

operation.)

Move heat generating bodies near the servo amplifier as

far away as possible.

Effective torque may be exceeding 100％ during operation.

Check the effective torque using the keypad or PC loader so that it may not exceed

100%.

Troubleshooting Method 7-13