YASKAWA SGD7S Product Manual page 426

12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.400:
Overvoltage
(Detected in the
main circuit
power supply
section of the
SERVOPACK.)
A.410:
Undervoltage
(Detected in the
main circuit
power supply
section of the
SERVOPACK.)
12-20
Possible Cause
The power supply
Measure the power
voltage exceeded the
supply voltage.
specified range.
The power supply is
not stable or was Measure the power
influenced by a light- supply voltage.
ning surge.
The voltage for AC Check the power sup-
power supply was too ply voltage and the
high during accelera- speed and torque
tion or deceleration. during operation.
The external regener-
Check the operating
ative resistance is too
conditions and the
high for the operating
regenerative resistance.
conditions.
The moment of inertia Check to see if the
ratio or mass ratio moment of inertia ratio
exceeded the allow- or mass ratio is within
able value. the allowable range.
A failure occurred in
–
the SERVOPACK.
The power supply
Measure the power
voltage went below
supply voltage.
the specified range.
The power supply
Measure the power
voltage dropped
supply voltage.
during operation.
A momentary power Measure the power
interruption occurred. supply voltage.
The SERVOPACK
–
fuse is blown out.
A failure occurred in
–
the SERVOPACK.
Confirmation
Set the AC/DC power
supply voltage within the
specified range.
Improve the power sup-
ply conditions, install a
surge absorber, and then
turn the power supply
OFF and ON again. If an
alarm still occurs, the
SERVOPACK may be
faulty. Replace the SER-
VOPACK.
Set the AC power supply
voltage within the speci-
fied range.
Select a regenerative
resistance value that is
appropriate for the oper-
ating conditions and load.
Increase the deceleration
time, or reduce the load.
While the main circuit
power supply is OFF, turn
the control power supply
to the SERVOPACK OFF
and ON again. If an alarm
still occurs, the SERVO-
PACK may be faulty.
Replace the SERVO-
PACK.
Set the power supply volt-
age within the specified
range.
Increase the power supply
capacity.
If you have changed the
setting of Pn509 (Momen-
tary Power Interruption
Hold Time), decrease the
setting.
Replace the SERVO-
PACK and connect a
reactor to the DC reactor
terminals ( 1 and
the SERVOPACK.
The SERVOPACK may be
faulty. Replace the SER-
VOPACK.
Continued from previous page.
Correction Reference
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*3
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page 6-15
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2) on
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Continued on next page.