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Alarm Number:
Possible Cause
Alarm Name
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.
The wiring is not cor-
rect or there is a faulty
connection in the
motor or encoder wir-
ing.
Operation was per-
formed that exceeded
A.710:
the overload protec-
Instantaneous
tion characteristics.
Overload
A.720:
An excessive load
Continuous
was applied during
Overload
operation because the
Servomotor was not
driven due to
mechanical problems.
A failure occurred in
the SERVOPACK.
The Servomotor was
rotated by an external
force.
A.730 and
A.731:
When the Servomo-
tor was stopped with
Dynamic Brake
the dynamic brake,
Overload
the rotational or linear
(An excessive
kinetic energy
power consump-
exceeded the capac-
tion by the
ity of the dynamic
dynamic brake
brake resistor.
was detected.)
A failure occurred in
the SERVOPACK.
The allowable fre-
A.740:
quency of the inrush
Inrush Current
current limiting resis-
Limiting Resistor
tor was exceeded
Overload
when the main circuit
(The main circuit
power supply was
power supply
turned ON and OFF.
was frequently
turned ON and
A failure occurred in
OFF.)
the SERVOPACK.
Confirmation
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
Set Pn385 to a value that
limits of the maximum
does not exceed the max-
motor speed setting
imum motor speed.
and the encoder output
resolution setting.
Make sure that the Servo-
Check the wiring.
motor and encoder are
correctly wired.
Reconsider the load and
Check the motor over-
operating conditions. Or,
load characteristics and
increase the motor
Run command.
capacity.
Check the operation
Correct the mechanical
reference and motor
problem.
speed.
The SERVOPACK may be
–
faulty. Replace the SER-
VOPACK.
Implement measures to
Check the operation
ensure that the motor will
status.
not be rotated by an
external force.
Reconsider the following:
• Reduce the Servomotor
Check the power con-
command speed.
• Decrease the moment
sumed by the DB resis-
tor to see how
of inertia ratio or mass
frequently the DB is
ratio.
• Reduce the frequency of
being used.
stopping with the
dynamic brake.
The SERVOPACK may be
–
faulty. Replace the SER-
VOPACK.
Reduce the frequency of
turning the main circuit
–
power supply ON and
OFF.
The SERVOPACK may be
–
faulty. Replace the SER-
VOPACK.
5.3 Troubleshooting Alarms
Continued from previous page.
Correction
Reference
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Continued on next page.
5
5-17
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Table of Contents
Troubleshooting
