15.2 Alarm Displays
15.2.2 Troubleshooting Alarms
15-23
15
Maintenance
A.710:
Instantaneous
Overload
A.720:
Continuous
Overload
The wiring is not cor-
rect or there is a faulty
contact in the motor
or encoder wiring.
Check the wiring.
Make sure that the Servo-
motor and encoder are
correctly wired.
Operation was per-
formed that exceeded
the overload protec-
tion characteristics.
Check the motor over-
load characteristics and
Run command.
Reconsider the load and
operating conditions. Or,
increase the motor
capacity.
–
An excessive load
was applied during
operation because the
Servomotor was not
driven due to
mechanical problems.
Check the operation
reference and motor
speed.
Correct the mechanical
problem.
–
There is an error in the
setting of Pn282 (Lin-
ear Encoder Pitch).
Check the setting of
Pn282.
Correct the setting of
Pn282.
There is an error in the
setting of Pn080 =
n.
X
(Motor
Phase Selection).
Check the setting of
Pn080 = n.
X
.
Set Pn080 = n.
X
to
an appropriate value.
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
–
A.730 and A.731:
Dynamic Brake
Overload
(An excessive
power consump-
tion by the
dynamic brake
was detected.)
The Servomotor was
rotated by an external
force.
Check the operation
status.
Implement measures to
ensure that the motor will
not be rotated by an
external force.
–
When the Servomo-
tor was stopped with
the dynamic brake,
the rotational or linear
kinetic energy
exceeded the capac-
ity of the dynamic
brake resistor.
Check the power con-
sumed by the DB resis-
tor to see how
frequently the DB is
being used.
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.
–
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
–
A.740:
Inrush Current
Limiting Resistor
Overload
(The main circuit
power supply
was frequently
turned ON and
OFF.)
The allowable fre-
quency of the inrush
current limiting resis-
tor was exceeded
when the main circuit
power supply was
turned ON and OFF.
–
Reduce the frequency of
turning the main circuit
power supply ON and
OFF.
–
A failure occurred in
the SERVOPACK.
–
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause
Confirmation
Correction
Reference