YASKAWA Σ-V Series User Manual page 256

Alarm:
Alarm Name
• 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
A.410:
240 V or less.
Undervoltage
The power supply voltage
(Detected in the SER-
dropped during operation.
VOPACK main circuit
power supply section.)
Occurrence of instantaneous
power interruption.
The SERVOPACK fuse is blown
out.
A SERVOPACK fault occurred.
A.450:
Main-Circuit A SERVOPACK fault occurred.
Capacitor Overvoltage
The order of phases U, V, and W
in the linear servomotor wiring is
incorrect.
A reference value exceeding the
A.510:
overspeed detection level was
Overspeed
input.
(The servomotor speed
exceeds the maximum.)
The motor speed exceeded the
maximum.
A SERVOPACK fault occurred.
The encoder output pulse output
frequency exceeded the limit.
A.511:
The encoder output pulse output
Overspeed of Encoder
frequency exceeded the limit
Output Pulse Rate
because the motor speed was too
high.
Abnormal vibration was detected
at the motor speed.
A.520:
Vibration Alarm
The mass ratio (Pn103) value is
greater than the actual value or is
greatly changed.
The linear servomotor vibrated
A.521:
considerably while performing
Autotuning Alarm
tuning-less function (factory set-
(Vibration was detected
ting).
while executing the
advanced autotuning,
The linear servomotor vibrated
one-parameter tuning,
considerably during advanced
EasyFFT, or tuning-less
autotuning, one-parameter tun-
function.)
ing, or EasyFFT.
Cause Investigative Actions
Measure the power supply voltage.
Measure the power supply voltage.
Measure the power supply voltage.
−
−
−
Check the linear servomotor wiring.
Check the input value.
Check the linear servomotor speed
waveform.
−
Check the encoder output pulse out-
put setting.
Check the encoder output pulse out-
put setting and the motor speed.
Check for abnormal noise from the
linear servomotor, and check the
speed and force waveform during
operation.
Check the mass ratio.
Check the motor speed waveform.
Check the motor speed waveform.
8.1 Troubleshooting
Corrective Actions
Set the power supply voltage within
the specified range.
Increase the power supply capacity.
When the instantaneous power cut
hold time Pn509 is set, decrease the
setting.
Replace the SERVOPACK, con-
nect an AC/DC reactor, and run the
SERVOPACK.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Replace the SERVOPACK.
Confirm that the linear servomotor
is correctly wired.
Reduce the reference value or adjust
the gain.
Reduce the speed reference input
gain, adjust the servo gain, or recon-
sider the operation conditions.
The SERVOPACK may be faulty.
Replace the SERVOPACK.
Decrease the setting of the encoder
output resolution (Pn281).
Decrease the motor speed.
Reduce the motor speed or reduce
the speed loop gain (Pn100).
Set the mass ratio (Pn103) to an
appropriate value.
Reduce the load so that the mass
ratio falls within the allowable
value, or raise the tuning level or
reduce the gain level using the tun-
ing-less function (Fn200).
Check the operation procedure of
corresponding function and take a
corrective action.
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