YASKAWA Σ-V Series User Manual page 258

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