YASKAWA SGD7S series Product Manual page 171

9.1 Alarm Displays
9.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.510:
Overspeed
(The motor
exceeded the
maximum speed.)
A.511:
Encoder Output
Pulse Overspeed
A.520:
Vibration Alarm
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
9-18
Possible Cause
The order of phases
U, V, and W in the Check the wiring of the
motor wiring is not Servomotor.
correct.
A reference value that
exceeded the over- Check the input refer-
speed detection level ence.
was input.
The motor exceeded Check the waveform of
the maximum speed. the motor speed.
A failure occurred in
–
the SERVOPACK.
The encoder output
Check the encoder out-
pulse frequency
put pulse setting.
exceeded the limit.
The encoder output
pulse frequency Check the encoder out-
exceeded the limit put pulse setting and
because the motor the motor speed.
speed was too high.
Check for abnormal
Abnormal oscillation motor noise, and check
was detected in the the speed and torque
motor speed. waveforms during oper-
ation.
The setting of Pn103
(Moment of Inertia
Check the moment of
Ratio) is greater than
inertia ratio or mass
the actual moment of
ratio.
inertia or was greatly
changed.
Check that the vibra-
The vibration detec-
tion detection level
tion level (Pn312 or
(Pn312 or Pn384) is
Pn384) is not suitable.
suitable.
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.
Confirmation
Make sure that the Servo-
motor is correctly wired.
Reduce the reference
value. Or, adjust the gain.
Reduce the speed refer-
ence input gain and
adjust the servo gain. Or,
reconsider the operating
conditions.
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
Decrease the setting of
Pn212 (Number of
Encoder Output Pulses)
or Pn281 (Encoder Out-
put Resolution).
Reduce the motor speed.
Reduce the motor speed.
Or, reduce the setting of
Pn100 (Speed Loop
Gain).
Set Pn103 (Moment of
Inertia Ratio) to an appro-
priate value.
Set a suitable vibration
detection level (Pn312 or
Pn384).
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.
Continued from previous page.
Correction Reference
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page 5-11
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page 5-36,
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Continued on next page.