YASKAWA SGMJV User Manual page 313

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
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)
9-14
Cause
The battery connection is incor-
rect.
The battery voltage is lower than
the specified value 2.7 V.
A SERVOPACK fault occurred.
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 SERVOPACK fault occurred.
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 SERVOPACK fault occurred.
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.
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 to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
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 to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Reduce the ambient operating tem-
perature of the servomotor to 40°C
or less.
Operate the SERVOPACK so that
the motor load remains within the
specified range.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK 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.