11.1 Troubleshooting
11-9
11
Inspection, Maintenance, and Troubleshooting
A.7A
Heat Sink Over-
heated
(Detected when
the heat sink tem-
perature exceeds
100°C.)
Occurred when the
control power sup-
ply was turned ON.
A SERVOPACK fault occurred. Replace the SERVOPACK.
The overload alarm has been reset by turning OFF
the power too many times.
Change the method to reset the alarm.
Occurred when the
main circuit power
supply was turned
ON or while the ser-
vomotor was run-
ning.
The load exceeds the rated load.
Reconsider the load and operation conditions, or
reconsider the servomotor capacity.
The SERVOPACK surrounding air temperature
exceeds 55°C.
The surrounding air temperature must be 55°C or
less.
A SERVOPACK fault occurred. Replace the SERVOPACK.
A.81
Encoder
Backup Error
(Detected on the
encoder side.)
(Only when an
absolute encoder
is connected.)
Occurred when the
control power sup-
ply was turned ON.
(Setting:
Pn002.2=1)
A SERVOPACK board fault occurred when an
absolute encoder is used with the setting for incre-
mental encoder.
Replace the SERVOPACK.
Occurred when the
control power sup-
ply was turned ON
using an absolute
encoder. (Setting:
Pn002.2=0)
Alarm occurred when the power to the absolute
encoder was initially turned ON.
Set up the encoder.
The encoder cable had been disconnected once.
First confirm the connection and set up the
encoder.
The power from both the PG power supply (+5 V)
and the battery power supply from the SERVO-
PACK is not being supplied.
Replace the battery or take similar measures to
supply power to the encoder, and set up the
encoder.
An absolute encoder fault occurred.
If the alarm cannot be reset by setting up the
encoder again, replace the encoder.
A SERVOPACK fault occurred. Replace the SERVOPACK.
A.82
Encoder Check-
sum Error
(Detected on the
encoder side.)
Occurred when the
control power sup-
ply was turned ON
or during an opera-
tion.
A fault occurred in the encoder and was detected by
encoder self-diagnosis.
Set up the encoder. If this alarm occurs fre-
quently, replace the servomotor.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Occurred when the
SEN signal turned
ON.
A fault occurred in the encoder and was detected by
encoder self-diagnosis.
Set up the encoder. If this alarm occurs fre-
quently, replace the servomotor.
A.83
Absolute
Encoder
Battery Error
(Detected when
the battery volt-
age is lower than
the specified
value 2 to 4 s
after the control
power supply is
turned ON.)
(Only when an
absolute encoder
is connected.)
When the control
power supply was
turned ON.
(Setting:
Pn002.2=1)
When the absolute encoder was used as an incre-
mental, a SERVOPACK board fault occurred.
Replace the SERVOPACK.
When the control
power supply was
turned ON using an
absolute encoder.
(Setting:
Pn002.2=0)
The battery connection is incorrect. Reconnect the battery.
The battery voltage is lower than the specified value
2.7 V.
Replace the battery, and then turn ON the power
to the encoder.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.84
Encoder Data
Error
(Detected on the
encoder side.)
Occurred when the
control power sup-
ply was turned ON.
A malfunction occurred in the encoder.
Turn the encoder power supply OFF and then
ON again. If this alarm occurs frequently,
replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
A malfunction occurred in the encoder due to exter-
nal noise.
Correct the wiring around the encoder by sepa-
rating the encoder cable from the power line, or
by checking the grounding and other wiring.)
An encoder fault occurred.
If this alarm occurs frequently, replace the servo-
motor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.85
Encoder Over-
speed
(Detected when
the encoder
power supply was
turned ON.)
(Detected on the
encoder side.)
Occurred when the
control power sup-
ply was turned ON.
When the encoder power supply turns ON and the
SEN signal is ON when using an absolute encoder,
the servomotor runs at 200 min
-1
or more.
Turn ON the encoder power supply when the ser-
vomotor runs at a speed less than 200 min
-1
.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Occurred during
normal operation.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
Table 11.3 Alarm Display and Troubleshooting (Cont’d)
Alarm
Display
Alarm Name
Situation at Alarm
Occurrence
Cause Corrective Actions
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