YASKAWA UAK series User Manual page 271

Alarm:
Alarm Name
• 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.
The power supply is unstable, or
was influenced by a lightening
surge.
A.40A: Acceleration/deceleration was
executed under the following
Converter Overvoltage
conditions.
(The DC-bus voltage
• The AC power supply voltage
inside the converter is
of 200-VAC SERVOPACK
abnormally high.)
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.
The moment of inertia exceeded
the allowable value in the SER-
VOPACK connected to the power
regeneration converter.
Power regeneration converter
failure
The main circuit cable is either
incorrectly wired or has a contact
fault.
A.40B:
Converter AC The main circuit power supply
Overvoltage voltage is higher than the speci-
fied range.
(The AC power supply
voltage inside the con-
verter is abnormally
An error occurred in the AC volt-
high.)
age detection circuit inside the
power regeneration converter.
Cause Investigative Actions
Measure the power supply voltage.
Measure the power supply voltage.
Check the power supply voltage and
the speed and torque during opera-
tion.
Make sure the moment of inertia
ratio is within the allowable range.
−
Make sure the wiring is correct.
Measure the AC power supply volt-
age.
−
11.2 Alarm Displays
(cont'd)
Corrective Actions
Set the AC/DC power supply volt-
age within the specified range.
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.
Set the AC power supply voltage
within the specified range.
Increase the deceleration time, or
reduce the load.
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.
Correct the wiring.
Set the voltage to an appropriate
value.
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.
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