YASKAWA UAK series User Manual page 277

Alarm:
Alarm Name
The operating ambient tempera-
ture is high.
The overload alarm has been
reset by turning OFF the power
too many times.
A.7BA:
Either the load is in excess or
Converter Heat Sink
operation is performed beyond
Overheated
the power regeneration process-
(The temperature of the
ing capacity.
heat sink inside the
power regeneration con-
The installation orientation of the
verter exceeded 100°C,
power regeneration converter is
or the thermistor in the
incorrect or the distance from
converter was discon-
other equipment is insufficient.
nected or damaged.)
Power regeneration converter
failure
The heat sink cooling fan in the
ventilation duct stopped or the
fan in the base mounting unit
stopped.
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
The encoder cable disconnected,
and connected again.
A.810:
Encoder Backup Error
The power from both the control
power supply (+5 V) and the bat-
(Detected on the
tery power supply from the SER-
encoder.)
VOPACK is not being supplied.
(Only when an absolute
encoder is connected.)
Absolute encoder failure
SERVOPACK failure
A.820:
Encoder failure
Encoder Checksum
Error
(Detected on the
encoder.)
SERVOPACK failure
The battery connection is incor-
rect.
The battery voltage is lower than
A.830:
the specified value 2.7 V.
Absolute Encoder
Battery Error
SERVOPACK failure
(The absolute encoder
battery voltage is lower
than the specified value.)
Encoder failure
Cause Investigative Actions
Check the operating ambient tem-
perature using a thermometer.
−
−
Check the installation conditions of
the power regeneration converter.
−
Make sure that there is no foreign
matter in the fans.
Check to see if the power was
turned ON initially.
Check to see if the power was
turned ON initially.
Check the encoder connector bat-
tery or the connector contact status.
−
−
−
−
Check the battery connection.
Measure the battery voltage.
−
−
11.2 Alarm Displays
(cont'd)
Corrective Actions
Improve the installation conditions
of the power regeneration converter
and reduce the operating ambient
temperature.
Remove the cause of the overload
alarm.
Review the load and operation con-
ditions.
Install the power regeneration con-
verter correctly as specified.
The power regeneration converter
may be faulty. Replace the power
regeneration converter.
Remove the foreign matter. Or
replace the fan.
Set up the encoder.
Confirm the connection and set up
the encoder.
Replace the battery or take similar
measures to supply power to the
encoder, and set up the encoder.
If the alarm cannot be reset by set-
ting up the encoder again, replace
the servomotor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Set up the encoder again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
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.
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