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5.3 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.710:
Instantaneous
Overload
A.720:
Continuous
Overload
A.730 and A.731:
Dynamic Brake
Overload
(An excessive
power consump-
tion by the
dynamic brake
was detected.)
A.740:
Inrush Current
Limiting Resistor
Overload
(The main circuit
power supply
was frequently
turned ON and
OFF.)
5-18
Possible Cause
The wiring is not cor-
rect or there is a faulty
Check the wiring.
contact in the motor
or encoder wiring.
Operation was per-
Check the motor overload
formed that exceeded
characteristics and Run
the overload protec-
command.
tion characteristics.
An excessive load
was applied during
operation because the
Check the operation refer-
Servomotor was not
ence and motor speed.
driven due to
mechanical problems.
There is an error in the
setting of Pn282 (Lin-
Check the setting of
ear Encoder Scale
Pn282.
Pitch).
There is an error in the
setting of Pn080 =
Check the setting of
n.X (Motor
Pn080 = n.X.
Phase Sequence
Selection).
A failure occurred in
–
the SERVOPACK.
The Servomotor was
Check the operation sta-
rotated by an external
tus.
force.
When the Servomo-
tor was stopped with
the dynamic brake,
Check the power con-
the rotational or linear
sumed by the DB resistor
kinetic energy
to see how frequently the
exceeded the capac-
DB is being used.
ity of the dynamic
brake resistor.
A failure occurred in
–
the SERVOPACK.
The allowable fre-
quency of the inrush
current limiting resis-
tor was exceeded
–
when the main circuit
power supply was
turned ON and OFF.
A failure occurred in
–
the SERVOPACK.
Confirmation
Make sure that the Servo-
motor and encoder are
correctly wired.
Reconsider the load and
operating conditions. Or,
increase the motor
capacity.
Correct the mechanical
problem.
Correct the setting of
Pn282.
Set Pn080 = n.X to
an appropriate value.
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
Implement measures to
ensure that the motor will
not be rotated by an
external force.
Reconsider the following:
• Reduce the Servomotor
command speed.
• Decrease the moment
of inertia ratio or mass
ratio.
• Reduce the frequency of
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.
Continued from previous page.
Refer-
Correction
ence
*1
–
–
*1
*1
–
–
–
–
–
–
Continued on next page.
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Table of Contents
Troubleshooting
