11.1 Troubleshooting
11-13
11
Inspection, Maintenance, and Troubleshooting
(2) Warning Display and Troubleshooting
Table 11.4 Warning Display and Troubleshooting
Warning
Display
Warning Name
Situation at Warning
Occurrence
Cause Corrective Actions
A.90
Excessive Posi-
tion Error Warn-
ing:
Warning for the
alarm A.d0
(In servo ON sta-
tus, the position
error pulses exceed
the excessive posi-
tion error warning
level set in the
parameter Pn51E.)
Occurred at the servo-
motor high-speed rota-
tion.
The contact in the servomotor U, V, and W wir-
ings is faulty.
Correct the servomotor wiring.
Correct the encoder wiring.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
The servomotor did not
run with position refer-
ence input.
The contact in the servomotor U, V, and W wir-
ings is faulty.
Correct the servomotor wiring.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Normal movement, but
occurred with a long
distance reference
input.
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.
Adjust slowly the position reference
pulse frequency.
Apply the smoothing function (Pn204 or
Pn208).
Correct the electronic gear ratio (Pn202,
Pn203).
Setting of the position error pulse over flow warning
level (Pn51E) is incorrect.
Set the parameter Pn51E to proper value.
The servomotor specifications do not meet the
load conditions such as torque and moment of
inertia.
Reconsider and correct the load and ser-
vomotor capacity.
A.91
Overload:
Warning for the
alarms A71 and
A72
In either of the fol-
lowing cases:
1. 20% of the over-
load detection level
of A71
2. 20% of the over-
load detection level
of A72.
Occurs when the servo
was ON.
Wiring is incorrect and the contact in servomotor
wiring is faulty.
Correct the servomotor wiring.
Wiring is incorrect and the contact in encoder
wiring is faulty.
Correct the encoder wiring.
A SERVOPACK fault occurred. Replace the SERVOPACK.
The servomotor did not
run with a reference
input.
Servomotor wiring is incorrect and the contact is
faulty.
Correct the servomotor wiring.
Encoder wiring is incorrect and the contact is
faulty.
Correct the encoder wiring.
The starting torque exceeds the maximum torque.
Reconsider the load and operation condi-
tions. Or, check the servomotor capacity.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred during nor-
mal operation.
The effective torque exceeds the rated torque.
Reconsider the load and operation condi-
tions. 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.92
Regenerative
Overload:
Warning for the
alarm A320
Occurred when the con-
trol power supply was
turned ON.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred during nor-
mal operation
(Large increase of
regenerative resistor
temperature.)
Regenerative energy is excessive.
Check the regenerative resistor capacity,
or reconsider the load and operation con-
ditions.
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 capacity,
or reconsider the load and operation con-
ditions.
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