AL-1320 (OPEN PHASE (CONVERTER))
An alarm
occurs.
An open phase occurs at the converter input power supply.
Before checking the wiring connections, turn
OFF the control power supply.
Use a tester to confirm that all the LEDs on the
SERVOPACK and converter are unlit and that
no charged electricity remains.
(It may take a few minutes until all the
electricity is discharged.)
Does the alarm occur
when the servo is OFF?
YesNo
Contact your Yaskawa
representative.
Replace the WRCA01 circuit board.
Alarm?
NoYes
Are the breaker's primary voltages
at R, S, and T all 200 V (+10% to
15%)?
Yes No
Change the breaker's primary voltage
to the specified voltage.
Alarm?
Yes No
Continue normal
operation.
Continue normal
operation.
Replace the converter.
Alarm?
NoYes
Is the contactor stuck?
(See Fig. 6.)
Yes No
Turn OFF the control power supply.
Replace the contactor.
Alarm?
NoYes
Converter
L1 L2 L3 B1 B2
rst
RST
Non-fuse
breaker
After turning OFF the non-fuse breaker, measure the
resistance between the non-fuse breaker's secondary
terminals and the converter's input power supply
terminals to confirm that all are open.
Measure the resistance between r and L1, s and L2,
and t and L3.
Fig. 6
Contact your Yaskawa
representative.
Replace the WRCA01 circuit board.
Alarm?
NoYes
Tester
(Measure the
resistance.)
CAUTION
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