Yaskawa Sigma-5 User Manual: Design and Maintenance - Rotary Motors - MECHATROLINK-II Communications Reference - Manual (Page 309)

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-12
A.410:
Undervoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
• For 100-VAC SERVOPACKs:
The AC power supply voltage
is 49 V or less.
• For 200-VAC SERVOPACKs:
The AC power supply voltage
is 120 V or less.
• For 400-VAC SERVOPACKs:
The AC 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.
−
Replace the SERVOPACK, con-
nect a reactor, and run the SERVO-
PACK.
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 motor 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 motor speed waveform.
Reduce the speed reference input
gain, adjust the servo gain, or recon-
sider the operating 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 fre-
quency exceeded the limit. Check the encoder output pulse set-
ting. Decrease the setting of the encoder
output pulse (Pn212).
The encoder output pulse output
frequency exceeded the limit
because the motor speed was too
high.
Check the encoder output pulse out-
put setting and motor speed.
Decrease the motor speed.
A.520:
Vibration Alarm
Abnormal vibration was detected
at the motor speed.
Check for abnormal noise from the
servomotor, and check the speed
and torque waveforms during oper-
ation.
Reduce the motor speed or reduce
the speed loop gain (Pn100).
The moment of inertia ratio
(Pn103) value is greater than the
actual value 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 one-
parameter tuning, Easy-
FFT, or tuning-less func-
tion.)
The servomotor vibrated consid-
erably while performing tuning-
less function. Check the motor speed waveform.
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 (Fn200) or reduce the rigid-
ity level.
The servomotor vibrated consid-
erably during one-parameter tun-
ing or EasyFFT.
Check the motor speed waveform.
Check the operation procedure of
corresponding function and take a
corrective action.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions