YASKAWA Sigma-7 SGD7S Series - Page 606

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
The SERVOPACK
fuse is blown out.
– Replace the SERVO-
PACK and connect a
reactor to the DC
Reactor terminals
( 1 and 2) on the
SERVOPACK.
–
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.510
(1510h)
Overspeed (The
motor exceeded
the maximum
speed.)
The order of phases
U, V, and W in the
motor wiring is not
correct.
Check the wiring of
the Servomotor.
Make sure that the
Servomotor is cor-
rectly wired.
–
A reference value that
exceeded the over-
speed detection level
was input.
Check the input ref-
erence.
Reduce the refer-
ence value. Or,
adjust the gain.
–
The motor exceeded
the maximum speed.
Check the waveform
of the motor speed.
Reduce the speed
reference input gain
and adjust the servo
gain. Or, reconsider
the operating condi-
tions.
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.511
(1511h)
Encoder Output
Pulse Over-
speed
The encoder output
pulse frequency
exceeded the limit.
Check the encoder
output pulse setting.
Decrease the setting
of Pn212 (Encoder
Output Pulses) or
Pn281 (Encoder
Output Resolution).
Ä Chap. 7.6.3
‘Setting for the
Encoder
Divided Pulse
Output’
page 218
The encoder output
pulse frequency
exceeded the limit
because the motor
speed was too high.
Check the encoder
output pulse setting
and the motor speed.
Reduce the motor
speed.
–
A.520
(1520h)
Vibration Alarm Abnormal oscillation
was detected in the
motor speed.
Check for abnormal
motor noise, and
check the speed and
torque waveforms
during operation.
Reduce the motor
speed. Or, reduce
the setting of Pn100
(Speed Loop Gain).
Ä Chap. 9.14
‘Manual Tuning’
page 405
The setting of Pn103
(Moment of Inertia
Ratio) is greater than
the actual moment of
inertia or was greatly
changed.
Check the moment
of inertia ratio or
mass ratio.
Correct the setting of
Pn103.
Ä Chap. 9.6
‘Estimating the
Moment of
Inertia’
page 308
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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