Yaskawa Σ-V Series AC Servo Drives Rotational Motor Analog Voltage Reference - Manual (Page 268)

9.1 Alarm Displays
9-9
9
Trou
blesh
ooting
A.7A0:
Heat Sink Overheated
(Detected when the heat
sink temperature
exceeds 90
° C.)
The surrounding air temperature
is too high. Check the surrounding air tempera-
ture using a thermostat.
Decrease the surrounding air tem-
perature by improving the SERVO-
PACK installation conditions.
The overload alarm has been
reset by turning OFF the power
too many times. Check the alarm history display
(Fn000) to see if the overload alarm
was reported.
Change the method for resetting the
alarm.
Excessive load was applied dur-
ing operation.
Check the accumulated load ratio
(Un009) to see the load during oper-
ation.
Reconsider the load conditions and
operating conditions.
Incorrect SERVOPACK installa-
tion orientation or/and insuffi-
cient space around the
SERVOPACK. Check the SERVOPACK installa-
tion conditions. Install the SERVOPACK correctly
as specified.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.810:
Encoder Backup Error
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
Check to see if the power was
turned ON initially.
Set up the encoder (Fn008).
The encoder cable disconnected,
and connected again.
Check to see if the power was
turned ON initially.
Confirm the connection and set up
the encoder (Fn008).
The power from both the control
power supply (+5 V) from the
SERVOPACK and the battery
power supply is not being sup-
plied.
Check the encoder connector bat-
tery or the connector contact status.
Replace the battery or take similar
measures to supply power to the
encoder, and set up the encoder
(Fn008).
An absolute encoder fault
occurred.
−
If the alarm cannot be reset by set-
ting up the encoder again, replace
the servomotor.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.820:
Encoder Checksum
Error
(Detected on the encoder
side.)
An encoder fault occurred. −
• Absolute encoder
Set up the encoder again using
Fn008. If the alarm still occurs,
the servomotor may be faulty.
Replace the servomotor.
• One-turn absolute encoder or
incremental encoder
The servomotor may be faulty.
Replace the servomotor.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
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 SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.840:
Encoder Data Error
(Detected on the encoder
side.)
An encoder malfunctioned. −
Restart the SERVOPACK. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
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.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions