6 TROUBLESHOOTING
45
LED
RUN DS1 DS2 Meaning
Meaning Trouble Causes Corrective Actions
UV
Input Undervoltage
Input undervoltage was detected
during operation.
200 V class : Approx. 150 VAC
or less
400 V class : Approx 300 VAC
or less
Power Supply Frequency Fault
Power su
l
fre
uenc
exceeded
S There is a fault to the equipment
at the power side.
S There is a fault to the power sup-
ply.
S Check the wiring of the equip-
ment at the power side.
S Adjust the power supply volt-
age.
the power supply frequency limit
(factory setting).
Power Supply Phase Rotation
Fault
Phase rotation of the input side
changed after the control power
supply was turned ON.
S The voltage detection circuit at
the power side is faulty.
S Replace the control card.
S Replace the power board.
Main Circuit Overvoltage
The main circuit DC voltage ex-
The regenerative energy from the
motor is too large.
Adjust the regenerative load.
ceeded the overvoltage detection
level.
The power supply voltage is too
high.
Decrease the voltage so it is with-
in specifications.
OV
c
ass :
pprox.
400 V class : Approx. 800 VDC
S The wiring between the voltage
detection circuit at the power
side (r1, 1, t1) and the main cir-
cuit (R, S, T) is not correct.
S The wiring distance between the
power regenerative unit and the
AC reactor is too long.
Check the wiring.
OC
Overcurrent
The input current of the power re-
generative unit exceeded the over-
current detection level.
(200 % of rated current)
S A short-circuit occurred at the
power regenerative output.
S Power supply drop
S The wiring between the volt-
age detection circuit at the
power side (r1, 1, t1) and the
main circuit (R, S, T) is not
correct.
S Improve the power supply.
S Check the wiring.
S Reset the fault after correcting
its cause.
CPF
Baseblock Circuit Error
EEPROM Error
Try turning the power supply off
and on.
CPU Internal A/D Coverter
Error
The control circuit is damaged. Replace the control card.
: ON : Blinking : OFF
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