YASKAWA SGD7S Product Manual page 427

Alarm Number:
Possible Cause
Alarm Name
The order of phases
U, V, and W in the
motor wiring is not
correct.
A reference value that
exceeded the over-
A.510:
speed detection level
Overspeed
was input.
(The motor
exceeded the
maximum speed.)
The motor exceeded
the maximum speed.
A failure occurred in
the SERVOPACK.
The encoder output
pulse frequency
exceeded the limit.
A.511:
Encoder Output
The encoder output
Pulse Overspeed
pulse frequency
exceeded the limit
because the motor
speed was too high.
Abnormal oscillation
was detected in the
motor speed.
The setting of Pn103
(Moment of Inertia
A.520:
Ratio) is greater than
Vibration Alarm
the actual moment of
inertia or was greatly
changed.
The vibration detec-
tion level (Pn312 or
Pn384) is not suitable.
The Servomotor
A.521:
vibrated considerably
Autotuning Alarm
while performing the
(Vibration was
tuning-less function.
detected while
executing the
custom tuning,
The Servomotor
Easy FFT, or the
vibrated considerably
tuning-less func-
while performing cus-
tion.)
tom tuning or Easy
FFT.
The setting of Pn385
A.550:
(Maximum Motor
Maximum Speed
Speed) is greater than
Setting Error
the maximum speed.
Confirmation
Check the wiring of the Make sure that the Servo-
Servomotor. motor is correctly wired.
Check the input refer- Reduce the reference
ence. value. Or, adjust the gain.
Reduce the speed refer-
ence input gain and
Check the waveform of
adjust the servo gain. Or,
the motor speed.
reconsider the operating
conditions.
The SERVOPACK may be
– faulty. Replace the SER-
VOPACK.
Decrease the setting of
Pn212 (Number of
Check the encoder out-
Encoder Output Pulses)
put pulse setting.
or Pn281 (Encoder Out-
put Resolution).
Check the encoder out-
put pulse setting and Reduce the motor speed.
the motor speed.
Check for abnormal
Reduce the motor speed.
motor noise, and check
Or, reduce the setting of
the speed and torque
Pn100 (Speed Loop
waveforms during oper-
Gain).
ation.
Check the moment of Set Pn103 (Moment of
inertia ratio or mass Inertia Ratio) to an appro-
ratio. priate value.
Check that the vibra-
Set a suitable vibration
tion detection level
detection level (Pn312 or
(Pn312 or Pn384) is
Pn384).
suitable.
Reduce the load so that
the moment of inertia ratio
is within the allowable
Check the waveform of
value. Or increase the
the motor speed.
load level or reduce the
rigidity level in the tuning-
less level settings.
Check the operating pro-
Check the waveform of cedure of corresponding
the motor speed. function and implement
corrections.
Check the setting of
Pn385, and the upper
Set Pn385 to a value that
limits of the maximum
does not exceed the max-
motor speed setting
imum motor speed.
and the encoder output
resolution setting.
12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Continued from previous page.
Correction Reference
–
−
–
page 6-24
–
page 8-80
page 8-16
page 6-50
page 8-13
page 8-42,
page 8-97
page 6-18
Continued on next page.
12
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