YASKAWA Sigma-7 SGD7S Series - Page 605

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A.400
(1400h)
Overvoltage
(Detected in the
main circuit
power supply
section of the
SERVOPACK.)
The power supply
voltage exceeded the
specified range.
Measure the power
supply voltage.
Set the AC/DC
power supply voltage
within the specified
range.
–
The power supply is
not stable or was influ-
enced by a lightning
surge.
Measure the power
supply voltage.
Improve the power
supply conditions,
install a Surge
Absorber, and then
turn the power
supply OFF and ON
again. If an alarm still
occurs, the SERVO-
PACK may be faulty.
Replace the SERVO-
PACK.
–
The voltage for AC
power supply was too
high during accelera-
tion or deceleration.
Check the power
supply voltage and
the speed and torque
during operation.
Set the AC power
supply voltage within
the specified range
–
The external regener-
ative resistance is too
high for the operating
conditions.
Check the operating
conditions and the
regenerative resist-
ance.
Select a regenerative
resistance value that
is appropriate for the
operating conditions
and load.
*2
The moment of inertia
ratio or mass ratio
exceeded the allow-
able value.
Check to see if the
moment of inertia
ratio or mass ratio is
within the allowable
range.
Increase the deceler-
ation time, or reduce
the load.
–
A failure occurred in
the SERVOPACK.
– While the main cir-
cuit power supply is
OFF, turn the control
power supply to the
SERVOPACK OFF
and ON again. If an
alarm still occurs, the
SERVOPACK may
be faulty. Replace
the SERVOPACK.
–
A.410
(1410h)
Undervoltage
(Detected in the
main circuit
power supply
section of the
SERVOPACK.)
The power supply
voltage went below
the specified range.
Measure the power
supply voltage.
Set the power supply
voltage within the
specified range.
–
The power supply
voltage dropped
during operation.
Measure the power
supply voltage.
Increase the power
supply capacity.
–
A momentary power
interruption occurred.
Measure the power
supply voltage.
If you have changed
the setting of Pn509
(Momentary Power
Interruption Hold
Time), decrease the
setting.
Ä Chap. 7.3
‘Operation for
Momentary
Power Interrup-
tions’ page 208
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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