11.2 Alarm Displays
11-17
Inspection, Maintenance, and
Troubleshooting
1
1
A.40A:
Converter Overvoltage
(The DC-bus voltage
inside the converter is
abnormally high.)
• For 200-V power regeneration
converter with DC-bus power
supply input:
The power voltage exceeded
410 V.
• For 400-V power regeneration
converter with DC-bus power
supply input:
The power voltage exceeded
820 V.
Measure the power supply voltage.
Set the AC/DC power supply volt-
age within the specified range.
The power supply is unstable, or
was influenced by a lightening
surge.
Measure the power supply voltage.
Improve the power supply condi-
tions, and turn ON the power supply
again after installing a surge
absorber. If the alarm still occurs,
the power regeneration converter
may be faulty. Replace the power
regeneration converter.
Acceleration/deceleration was
executed under the following
conditions.
• The AC power supply voltage
of 200-VAC SERVOPACK
was in the range between 230
V and 270 V.
• The AC power supply voltage
of 400-VAC SERVOPACK
was in the range is between
480 V and 560 V.
Check the power supply voltage and
the speed and torque during opera-
tion.
Set the AC power supply voltage
within the specified range.
The moment of inertia exceeded
the allowable value in the SER-
VOPACK connected to the power
regeneration converter.
Make sure the moment of inertia
ratio is within the allowable range.
Increase the deceleration time, or
reduce the load.
Power regeneration converter
failure
−
Turn OFF the control power and
then turn it ON again while the
main circuit power supply is OFF.
If the alarm still occurs, the power
regeneration converter may be
faulty. Replace the power regenera-
tion converter.
A.40B:
Converter AC
Overvoltage
(The AC power supply
voltage inside the con-
verter is abnormally
high.)
The main circuit cable is either
incorrectly wired or has a contact
fault.
Make sure the wiring is correct.
Correct the wiring.
The main circuit power supply
voltage is higher than the speci-
fied range.
Measure the AC power supply volt-
age.
Set the voltage to an appropriate
value.
An error occurred in the AC volt-
age detection circuit inside the
power regeneration converter.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the power regeneration con-
verter may be faulty. Replace the
power regeneration converter.
(cont’d)
Alarm:
Alarm Name
Cause
Investigative Actions
Corrective Actions