YASKAWA Sigma-7 Series Product Manual page 103

Alarm Number:
Possible Cause
Alarm Name
Twisting of mechani-
cal parts has occurred
between axes A and
B.
A.50D:
Position Devia-
Axis A and axis B are
tion Between
not synchronized with
Axes Overflow
the reference.
Alarm
Pn66A (Position Devi-
ation Between Axes
Overflow Alarm Level)
is low for the operat-
ing conditions.
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.
A.51A:
The axis undergoing
Synchronized
synchronized stop-
Stopping Over-
ping was accelerating.
speed Alarm
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.
Confirmation
Resolve the twisting of
mechanical parts between
Check the position
the axes.
deviation between the
Set the Position Correc-
axes.
tion Table to appropriate
values.
The host controller should
Check the reference
command the system to
position for axis A and
synchronize operation of
axis B.
axis A and axis B.
Check if Pn66A (Posi-
tion Deviation Between Set Pn66A to an appropri-
Axes Overflow Alarm ate value.
Level) is appropriate.
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
SERVOPACK.
Check the feedback Remove the cause of
speed of the axis under- acceleration for the axis
going synchronized undergoing synchronized
stopping. stopping.
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.
6.1 Alarm Displays
6.1.2 Troubleshooting Alarms
Continued from previous page.
Correction Reference
–
page 3-7
–
page 5-3
–
−
–
–
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Continued on next page.
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