A.410:
Undervoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
• For 100 VAC SERVOPACKs:
The power supply voltage is 49
V or less.
• For 200 VAC SERVOPACKs:
The power supply voltage is
120 V or less.
• For 400 VAC SERVOPACKs:
The power supply voltage is
240 V or less.
Measure the power supply voltage.
Set the power supply voltage within
the specified range.
The power supply voltage
dropped during operation.
Measure the power supply voltage. Increase the power supply capacity.
Occurrence of instantaneous
power interruption.
Measure the power supply voltage.
When the instantaneous power cut
hold time Pn509 is set, decrease the
setting.
The SERVOPACK fuse is blown
out.
−
Repair or replace the SERVO-
PACK, connect an AC/DC reactor,
and run the SERVOPACK.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.450:
Main-Circuit
Capacitor Overvoltage
A SERVOPACK fault occurred. − Replace the SERVOPACK.
A.510:
Overspeed
(The servomotor speed
exceeds the maximum.)
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
Check the servomotor wiring.
Confirm that the servomotor is cor-
rectly wired.
A reference value exceeding the
overspeed detection level was
input.
Check the input value.
Reduce the reference value or adjust
the gain.
The motor speed exceeded the
maximum.
Check the servomotor speed wave-
form.
Reduce the speed reference input
gain, adjust the servo gain, or recon-
sider the operation conditions.
A SERVOPACK fault occurred. −
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.511:
Overspeed of Encoder
Output Pulse Rate
The encoder output pulse output
frequency exceeded the limit.
Check the encoder output pulse out-
put setting.
Decrease the setting of the encoder
output pulse (Pn212).
The encoder output pulse output
frequency exceeded the limit
because the servomotor speed
was too high.
Check the encoder output pulse out-
put setting and servomotor speed.
Decrease the servomotor speed.
A.520:
Vibration Alarm
Abnormal vibration was detected
at the servomotor rotation speed.
Check for abnormal noise from the
servomotor, and check the speed
and torque waveform during opera-
tion.
Reduce the servomotor speed or
reduce the speed loop gain (Pn100).
The moment of inertia ratio
(Pn103) value is greater than the
actual valu
e or is greatly
changed.
Check the moment of inertia ratio.
Set the moment of inertia ratio
(Pn103) to an appropriate value.
A.521:
Autotuning Alarm
(Vibration was detected
while executing the
advanced autotuning,
one-parameter tuning,
EasyFFT, or tuning-less
function.)
The servomotor vibrated consid-
erably while performing tuning-
less function (factory setting).
Check the servomotor speed wave-
form.
Reduce the load so that the moment
of inertia ratio falls within the
allowable value, or raise the tuning
level or reduce the gain level using
the tuning-less function (Fn200).
The servomotor vibrated consid-
erably during advanced autotun-
ing, one-parameter tuning, or
EasyFFT.
Check the servomotor speed wave-
form.
Check the operation procedure of
corresponding function and take a
corrective action.
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions
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