9.1 Troubleshooting
9-15
9
(2) Warning Display and Troubleshooting
Table 9.4 Warning Display and Troubleshooting
Warning
Display
Warning Name Situation at Warning
Occurrence
Cause Corrective Actions
A.900
Position Error
Pulse Overflow
Occurred during oper-
ation.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Wiring is incorrect or the contact of servomo-
tor U, V, and W is faulty.
Correct the servomotor wiring.
Correct the encoder wiring.
The SERVOPACK gain adjustment is
improper.
Increase the speed loop gain (Pn100)
and position loop gain (Pn102).
The position reference pulse frequency is too
high.
Decrease slowly the position reference
pulse frequency.
Apply the smoothing function.
Adjust the electronic gear ratio.
Setting of the parameter Pn520 (Position Error
Pulse Alarm Level) is improper.
Set the parameter Pn520 to a value
other than “0”.
The servomotor specifications do not meet the
load conditions (torque, moment of inertia).
Reconsider and correct the load and
servomotor capacity.
A.910
Overload
Warning for the
alarms A.710 and
A.720
In either of the fol-
lowing cases:
1. 20% of the over-
load detection level
of A.710
2. 20% of the over-
load detection level
of A.720.
Occurred when the
servo was ON.
Incorrect wiring and faulty contact in servo-
motor wiring
Correct the servomotor wiring.
Incorrect wiring and faulty contact in encoder
wiring
Correct the encoder wiring.
A SERVOPACK fault occurred. Replace the SERVOPACK.
The servomotor did
not run with a refer-
ence input.
Incorrect wiring and faulty contact in servo-
motor wiring
Correct the servomotor wiring.
Incorrect wiring and faulty contact in encoder
wiring
Correct the encoder wiring.
The starting torque exceeds the maximum
torque.
Reconsider the load and operation con-
ditions. Or, check the servomotor
capacity.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred during oper-
ation.
The effective torque exceeds the rated torque. Reconsider the load and operation con-
ditions. Or, check the servomotor
capacity.
Temperature in the SERVOPACK panel is
high.
Reduce the in-panel temperature to
55°C or less.
A SERVOPACK fault occurred. Replace the SERVOPACK.
A.920
Regenerative
Overload
Occurred when the
control power supply
was turned ON.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Warning for the
alarm A.320
Occurred during nor-
mal operation.
(Large increase of
regenerative resistor
temperature)
Regenerative energy is excessive. Check the regenerative resistor capac-
ity, or reconsider the load and opera-
tion conditions.
Regenerative status continues.
Occurred during nor-
mal operation.
(Small increase of
regenerative resistor
temperature)
The setting of parameter Pn600 is smaller than
the external regenerative resistor capacity.
Correct the setting of parameter
Pn600.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred at servomo-
tor deceleration.
Regenerative energy is excessive. Check the regenerative resistor capac-
ity, or reconsider the load and opera-
tion conditions.
SIEPS80000025.book 15 ページ ２００４年１０月２５日 月曜日 午前１１時５７分
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