YASKAWA SGD7S Product Manual page 428

12.2 Alarm Displays
12.2.2 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.)
12-22
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 over-
formed that exceeded
load characteristics and
the overload protec-
Run command.
tion characteristics.
An excessive load
was applied during
Check the operation
operation because the
reference and motor
Servomotor was not
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
rotated by an external
status.
force.
When the Servomo-
tor was stopped with
Check the power con-
the dynamic brake,
sumed by the DB resis-
the rotational or linear
tor to see how
kinetic energy
frequently the DB is
exceeded the capac-
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.
Correction Reference
page 4-26
–
–
page 5-16
page 5-21
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Continued on next page.