YASKAWA SGDV series User Manual page 309

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
A.830:
Absolute Encoder
Battery Error
(The absolute encoder
battery voltage is lower
than the specified value.)
A.840:
Encoder Data Error
(Detected on the encoder
side.)
A.850:
Encoder Overspeed
(Detected when the con-
trol power supply was
turned ON.)
(Detected on the encoder
side.)
A.860:
Encoder Overheated
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
A.8A0:
External Encoder
Error
A.8A1:
External Encoder
Error of Module
A.8A2:
External Encoder
Error of Sensor
(Incremental)
A.8A3:
External Encoder
Error of Position
(Absolute)
9-14
Cause
The battery connection is incor-
rect.
The battery voltage is lower than
the specified value 2.7 V.
A fault occurred in the SERVO-
PACK.
An encoder malfunctioned.
Malfunction of encoder because
of noise interference, etc.
The servomotor speed is higher
-1
than 200 min when the control
power supply was turned ON.
An encoder fault occurred.
A fault occurred in the SERVO-
PACK.
The ambient operating tempera-
ture around the servomotor is too
high.
The motor load is greater than the
rated load.
An encoder fault occurred.
A fault occurred in the SERVO-
PACK.
Setting the zero point position of
external absolute encoder failed
because the servomotor rotated.
An external encoder fault
occurred.
An external encoder fault
occurred.
A serial converter unit fault
occurred.
An external encoder fault
occurred.
An external absolute encoder
fault occurred.
Investigative Actions
Check the battery connection.
Measure the battery voltage.
−
−
−
Check the motor rotating speed
(Un000) to confirm the servomotor
speed when the power is turned ON.
−
−
Measure the ambient operating tem-
perature around the servomotor.
Check the accumulated load ratio
(Un009) to see the load.
−
−
Before setting the zero point posi-
tion, use the fully-closed feedback
pulse counter (Un00E) to confirm
that the servomotor is not rotating.
−
−
−
−
−
(cont'd)
Corrective Actions
Reconnect the battery.
Replace the battery.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
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.
Reduce the servomotor speed to a
-1
value less than 200 min , and turn
ON the control power supply.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
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
must be 40°C or less.
The motor load must be within the
specified range.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
The servomotor must be stopped
while setting the zero point posi-
tion.
Replace the external encoder.
Replace the external encoder.
Replace the serial converter unit.
Replace the external encoder.
The external absolute encoder may
be faulty. Refer to the encoder man-
ufacturer's instruction manual for
corrective actions.