YASKAWA E-V-MD Series User Manual page 269

Alarm Number:
Alarm Name
(Alarm Description)
Abnormal vibration was detected
at the motor speed.
A.520:
Vibration Alarm
The moment of inertia ratio
(Pn103) value is greater than the
actual value or is greatly
changed.
A.521:
The servomotor vibrated consid-
Autotuning Alarm
erably while performing tuning-
(Vibration was
less function.
detected while
executing the one-
parameter tuning,
The servomotor vibrated consid-
EasyFFT, or tuning-
erably during one-parameter tun-
less function.)
ing or EasyFFT.
Incorrect wiring or contact fault
of servomotor and encoder.
A.710:
Operation beyond the overload
A.720:
protection characteristics.
Overload
A.710: High Load
Excessive load was applied
A.720: Low Load
during operation because the ser-
vomotor was not driven due to
mechanical problems.
A.7A3:
The surrounding air temperature
Control Board
of the SERVOPACK is too high.
Overheat
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
A.810:
The encoder cable disconnected,
and connected again.
Encoder Backup Error
(Only when an
The power from both the control
absolute encoder is
power supply (+5 V) from the
connected.)
SERVOPACK and the battery
(Detected on the power supply is not being sup-
plied.
encoder side.)
An absolute encoder fault
occurred.
A.820:
Encoder Checksum
Error An encoder fault occurred.
(Detected on the
encoder side.)
A.830: The battery connection is incor-
rect.
Absolute Encoder
Battery Error
(The absolute encoder
The battery voltage is lower than
battery voltage is
the specified value 2.7 V.
lower than the
specified value.)
Cause Investigative Actions
Check for abnormal noise from the
servomotor, and check the speed
and torque waveforms during oper-
ation.
Check the moment of inertia ratio.
Check the motor speed waveform.
Check the motor speed waveform.
Check the wiring.
Check the servomotor overload
characteristics and executed run
command.
Check the executed operation refer-
ence and motor speed.
Measure the surrounding air tem-
perature of the SERVOPACK.
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.
10.2 Alarm Displays
(cont'd)
Corrective Actions
Reduce the motor speed or reduce
the speed loop gain (PnAC2).
Set the moment of inertia ratio
(Pn103) to an appropriate value.
Reduce the load so that the moment
of inertia ratio falls within the
allowable value, or raise the load
level using the tuning-less levels
setting or reduce the rigidity level.
Check the operation procedure of
corresponding function and take a
corrective action.
Confirm that the servomotor and
encoder are correctly wired.
Reconsider the load conditions and
operating conditions. Or, increase
the motor capacity.
Remove the mechanical problems.
Improve the installation conditions
of the SERVOPACK to reduce the
surrounding air temperature.
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.
• 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.
Reconnect the battery.
Replace the battery.
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