Description of Fault Codes
‑69‑
Cause
Troubleshooting
Solution
An error occurs on the
communication between the
servo drive and the encoder.
Check whether the value of
H0b.28 is not 0.
1. Check whether H00.00
(Motor code) is set
properly.
2. Check whether the
encoder cable is
connected properly.
3. Check whether the servo
drive and motor are
grounded properly. You
can wind a magnetic ring
on the encoder cable to
reduce interference.
● E740.3: Absolute encoder single‑turn calculation error
Description:
The encoder is faulty.
Cause
Troubleshooting
Solution
An internal fault occurs on
the encoder.
Check whether bit7 of
H0b.28 is set to 1.
1. Check whether the
encoder version (H00.04)
is proper.
2. Check whether the
encoder cable is proper.
3. Replace the motor.
● E740.6: Encoder data write error
Description:
The attempt to write the encoder data fails.
Cause
Troubleshooting
Solution
An error occurs when writing
the position offset after
angle auto‑tuning.
Replace with a new encoder
cable. If the fault no longer
occurs after cable
replacement, it indicates the
original encoder cable is
damaged. Keep the motor in
a certain position, power on
the system several times
and observe the change of
H0b.17 (Electrical angle).
The electrical angle
deviation should be within
±30° when the motor
position does not change.
Use a new encoder cable. If
the fault persists after the
encoder cable is replaced,
the encoder may be faulty.
In this case, replace the
servo motor.
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