Description of Fault Codes
‑49‑
■ The DC bus voltage exceeds the discharge threshold.
■ The phase U current of size C/D/E models is greater than 1/4 of H01.07.
■ Overcurrent occurs on phase‑P and phase‑N of servo drives in SIZE A and B.
Cause
Confirming Method
Solution
1. The servo drive power
cables (U/V/W) are short‑
circuited to ground.
Disconnect the motor cables
and measure whether the
servo drive power cables (U/
V/W) are short‑circuited to
ground (PE).
Connect the cables again or
replace the servo drive
power cables.
2. The motor is short‑
circuited to ground.
After confirming the servo
drive power cables and
motor cables are connected
properly, measure whether
the insulation resistance
between the servo drive U/
V/W side and the PE cable is
at MΩ level.
Replace the motor.
3. The servo drive is faulty.
Disconnect the power cables
from the servo drive, but the
fault persists after the servo
drive is powered off and on
repeatedly.
Replace the servo drive.
4. The motor speed is too
high during phase‑to‑ground
detection.
Check whether the motor is
in the generating status
during power‑on.
Reduce the motor speed.
● E234.0: Runaway
Cause:
The torque reference direction is opposite to the speed feedback direction in the
torque control mode.
The speed feedback direction is opposite to the speed reference direction in the
position or speed control mode.
Cause
Confirming Method
Solution
1. The U/V/W cables are
connected in the wrong
phase sequence.
Check whether the servo
drive power cables are
connected in the correct
sequence at both ends.
Connect the U/V/W cables in
the correct phase sequence.
2. An error occurs on the
initial phase detection of the
motor rotor due to
disturbing signals upon
power‑on.
The UVW phase sequence is
correct. But Er.234 occurs
when the servo drive is
enabled.
Power off and on the servo
drive again.
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