
9.1 Alarm Displays
9-11
9
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A.400:
Overvoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
• For 100-VAC SERVOPACKs:
The AC power supply voltage
exceeded 145 V.
• For 200-VAC SERVOPACKs:
The AC power supply voltage
exceeded 290 V.
• For 400-VAC SERVOPACKs:
The AC power supply voltage
exceeded 580 V.
• For 200-VAC SERVOPACKs:
with DC power supply input:
The DC power supply voltage
exceeded 410 V.
• For 400-VAC SERVOPACKs:
The DC power supply voltage
exceeded 820 V.
Measure the power supply voltage. Set AC/DC power supply voltage
within the specified range.
The power supply is unstable, or
was influenced by a lightning
surge.
Measure the power supply voltage.
Improve the power supply condi-
tions, e.g., by installing a surge
absorber. Then, turn the SERVO-
PACK power supply OFF and ON
again. If the alarm still occurs, the
SERVOPACK may be faulty.
Replace the SERVOPACK.
Voltage for AC power supply was
too high during acceleration or
deceleration.
Check the power supply voltage and
the speed and torque during opera-
tion.
Set AC power supply voltage within
the specified range.
The external regenerative resis-
tance is too high for the actual
operating conditions.
Check the operating conditions and
the regenerative resistance.
Select a regenerative resistance
value appropriate for the operating
conditions and load.
The moment of inertia ratio
exceeded the allowable value.
Confirm that the moment of inertia
ratio is within the allowable range.
Increase the deceleration time, or
reduce the load.
A SERVOPACK fault occurred.
−
Turn the SERVOPACK’s control
power supply OFF and ON again
while the main circuit power supply
is OFF. If the alarm still occurs, the
SERVOPACK may be faulty.
Replace the SERVOPACK.
A.410:
Undervoltage
(Detected in the SER-
VOPACK main circuit
power supply section.)
• For 100-VAC SERVOPACKs:
The AC power supply voltage
is 49 V or less.
• For 200-VAC SERVOPACKs:
The AC power supply voltage
is 120 V or less.
• For 400-VAC SERVOPACKs:
The AC power supply voltage
is 240 V or less.
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.
Occurrence of instantaneous
power interruption.
Measure the power supply voltage.
When the instantaneous power cut
hold time (Pn509) is set, decrease
the setting.
The SERVOPACK fuse is blown
out.
−
Replace the SERVOPACK, con-
nect a reactor, and run the SERVO-
PACK.
A SERVOPACK fault occurred.
−
The SERVOPACK may be faulty.
Replace the SERVOPACK.
A.450:
Main-Circuit
Capacitor Overvoltage
A SERVOPACK fault occurred.
−
Replace the SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
Cause
Investigative Actions
Corrective Actions