8.1 Troubleshooting
8-13
8
T
roubleshooting
A.820:
Encoder Checksum
Error
(Detected on the linear
scale side.)
A linear scale fault occurred.
−
The linear scale may be faulty.
Replace the linear scale.
A SERVOPACK fault occurred.
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.840:
Encoder Data Error
(Detected on the linear
scale side.)
A linear scale fault occurred.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Replace the linear scale.
Malfunction of linear scale
because of noise interference, etc.
−
Correct the wiring around the linear
scale by separating the cable for lin-
ear scale from the linear servomotor
main circuit cable or by checking
the grounding and other wiring.
A.850:
Encoder Overspeed
(Detected when the con-
trol power supply was
turned ON.)
(Detected on the linear
scale side.)
The motor speed was higher than
the specified speed when the con-
trol power supply was turned ON.
Check the motor speed (Un000) to
confirm the motor speed when the
power is turned ON.
Reduce the motor speed to a value
below the speed specified by the
linear scale manufacturer, and turn
ON the control power supply.
A linear scale fault occurred.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear servomotor may
be faulty. Replace the linear servo-
motor.
A SERVOPACK fault occurred.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.860:
Encoder Overheated
(Detected only when an
absolute linear scale is
connected.)
(Detected on the linear
scale side.)
The ambient operating tempera-
ture of the linear servomotor is
too high.
Measure the ambient operating tem-
perature of the linear servomotor.
The ambient operating temperature
of the linear servomotor must be
40
°
C or less.
The linear servomotor load is
greater than the rated load.
Check the accumulated load ratio
(Un009) to see the load.
The linear servomotor load must be
within the specified range.
A linear scale fault occurred.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear servomotor may
be faulty. Replace the linear servo-
motor.
A SERVOPACK fault occurred.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.890:
Encoder Scale Error
A linear scale fault occurred.
−
The linear scale may be faulty.
Replace the linear scale.
A.891:
Encoder Module Error
A linear scale fault occurred.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear servomotor may
be faulty. Replace the linear servo-
motor.
A.b31:
Current Detection
Error 1
(Phase-U)
The current detection circuit for
phase U is faulty.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.b32:
Current Detection
Error 2
(Phase-V)
The current detection circuit for
phase V is faulty.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Alarm:
Alarm Name
Cause
Investigative Actions
Corrective Actions
