YASKAWA Sigma-7 Series Product Manual page 104

6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.521:
Autotuning Alarm
(Vibration was
detected while
executing the
custom tuning,
Easy FFT, or the
tuning-less func-
tion.)
A.550:
Maximum Speed
Setting Error
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.)
6-16
Possible Cause
The Servomotor
vibrated considerably Check the waveform of
while performing the the motor speed.
tuning-less function.
The Servomotor
vibrated considerably
Check the waveform of
while performing cus-
the motor speed.
tom tuning or Easy
FFT.
Check the setting of
The setting of Pn385 Pn385, and the upper
(Maximum Motor limits of the maximum
Speed) is greater than motor speed setting
the maximum speed. and the encoder output
resolution setting.
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.
Confirmation
Reduce the load so that
the moment of inertia ratio
is within the allowable
value. Or increase the
load level or reduce the
rigidity level in the tuning-
less level settings.
Check the operating pro-
cedure of corresponding
function and implement
corrections.
Set Pn385 to a value that
does not exceed the max-
imum motor speed.
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
SERVOPACK.
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
SERVOPACK.
Continued from previous page.
Correction Reference
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