Yaskawa Sigma-5 Large Capacity Users Manual: Design and Maintenance-Command Option Interface - Manual (Page 309)

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-14
A.830:
Absolute Encoder
Battery Error
(The absolute encoder
battery voltage is lower
than the specified value.)
The battery connection is incor-
rect.
Check the battery connection. Reconnect the battery.
The battery voltage is lower than
the specified value 2.7 V.
Measure the battery voltage. Replace the battery.
A fault occurred in the SERVO-
PACK.
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.840:
Encoder Data Error
(Detected on the encoder
side.)
An encoder malfunctioned. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Malfunction of encoder because
of noise interference, etc.
−
Correct the wiring around the
encoder by separating the encoder
cable from the servomotor main cir-
cuit 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 encoder
side.)
The servomotor speed is higher
than 200 min
-1 when the control
power supply was turned ON.
Check the motor rotating speed
(Un000) to confirm the servomotor
speed when the power is turned ON.
Reduce the servomotor speed to a
value less than 200 min
-1 , and turn
ON the control power supply.
An encoder fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
A fault occurred in the SERVO-
PACK.
−
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
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
The ambient operating tempera-
ture around the servomotor is too
high.
Measure the ambient operating tem-
perature around the servomotor.
The ambient operating temperature
must be 40 °C or less.
The motor load is greater than the
rated load.
Check the accumulated load ratio
(Un009) to see the load.
The motor load must be within the
specified range.
An encoder fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.8A0:
External Encoder
Error
Setting the zero point position of
external absolute encoder failed
because the servomotor rotated.
Before setting the zero point posi-
tion, use the fully-closed feedback
pulse counter (Un00E) to confirm
that the servomotor is not rotating.
The servomotor must be stopped
while setting the zero point posi-
tion.
An external encoder fault
occurred.
− Replace the external encoder.
A.8A1:
External Encoder
Error of Module
An external encoder fault
occurred.
− Replace the external encoder.
A serial converter unit fault
occurred.
− Replace the serial converter unit.
A.8A2:
External Encoder
Error of Sensor
(Incremental)
An external encoder fault
occurred.
− Replace the external encoder.
A.8A3:
External Encoder
Error of Position
(Absolute)
An external absolute encoder
fault occurred.
−
The external absolute encoder may
be faulty. Refer to the encoder man-
ufacturer’s instruction manual for
corrective actions.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions