CHAPTER 7 MAINTENANCE AND INSPECTION
Troubleshooting Method 7-13
7
18. Deviation Overflow
[Display] [Description of detected alarm]
[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.
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] [Description of detected alarm]
[Cause and remedy]
Cause Remedy
Reduce the ambient temperature to 55°C or lower. (40°C
or lower temperatures are recommended for regular
operation.)
The ambient temperature exceeds
55°C.
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%.
A position deviation amount equivalent to servomotor
revolutions specified in PA2_69 (deviation detection overflow
value) is accumulated inside the servo amplifier.
The temperature of the servo amplifier has exceeded the
allowable limit.
oF
AH
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