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Alarm Number:
Possible Cause
Alarm Name
The order of phases
U, V, and W in the
motor wiring is not
correct.
A reference value that
exceeded the over-
A.510:
speed detection level
Overspeed
was input.
(The motor
exceeded the
maximum speed.)
The motor exceeded
the maximum speed.
A failure occurred in
the SERVOPACK.
Abnormal oscillation
was detected in the
motor speed.
The setting of Pn103
(Moment of Inertia
A.520:
Ratio) is greater than
Vibration Alarm
the actual moment of
inertia or was greatly
changed.
The vibration detec-
tion level (Pn312 or
Pn384) is not suitable.
The Servomotor
A.521:
vibrated considerably
Autotuning Alarm
while performing the
(Vibration was
tuning-less function.
detected while
executing the
custom tuning,
The Servomotor
Easy FFT, or the
vibrated considerably
tuning-less func-
while performing cus-
tion.)
tom tuning or Easy
FFT.
The setting of Pn385
A.550:
(Maximum Motor
Maximum Speed
Speed) is greater than
Setting Error
the maximum speed.
Confirmation
Check the wiring of the
Make sure that the Servo-
Servomotor.
motor is correctly wired.
Check the input refer-
Reduce the reference
ence.
value. Or, adjust the gain.
Reduce the speed refer-
ence input gain and
Check the waveform of
adjust the servo gain. Or,
the motor speed.
reconsider the operating
conditions.
The SERVOPACK may be
–
faulty. Replace the SER-
VOPACK.
Check for abnormal motor
Reduce the motor speed.
noise, and check the
Or, reduce the setting of
speed and torque wave-
Pn100 (Speed Loop
forms during operation.
Gain).
Set Pn103 (Moment of
Check the moment of
Inertia Ratio) to an appro-
inertia ratio or mass ratio.
priate value.
Check that the vibration
Set a suitable vibration
detection level (Pn312 or
detection level (Pn312 or
Pn384) is suitable.
Pn384).
Reduce the load so that
the moment of inertia ratio
is within the allowable
Check the waveform of
value. Or increase the
the motor speed.
load level or reduce the
rigidity level in the tuning-
less level settings.
Check the operating pro-
Check the waveform of
cedure of corresponding
the motor speed.
function and implement
corrections.
Check the setting of
Pn385, and the upper lim-
Set Pn385 to a value that
its of the maximum motor
does not exceed the max-
speed setting and the
imum motor speed.
encoder output resolu-
tion setting.
5.3 Troubleshooting Alarms
Continued from previous page.
Refer-
Correction
ence
–
−
–
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Continued on next page.
5
5-17
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Table of Contents
Troubleshooting
