Description of Fault Codes
‑78‑
● EB01.4: Target position beyond upper/lower limit
Description:
The target position exceeds the upper/lower limit of the unit position in the single‑
turn absolute mode.
Cause
Troubleshooting
Solution
The target position exceeds
the upper/lower limit of the
unit position in the single‑
turn absolute mode.
Check whether the set target
position is within the single‑
turn upper/lower limit.
Set the target position to a
value within the upper/
lower limit.
● EB02.0: Position deviation exceeding threshold in fully closed‑loop
Description:
The absolute value of position deviation in fully closed‑loop mode exceeds the
value of H0F.08 (Excessive position deviation threshold in fully closed‑loop mode).
Cause
Troubleshooting
Solution
1. U/V/W output phase loss
or incorrect phase sequence
occurs on the servo drive.
Perform a no‑load trial run
on the motor and check the
wiring.
Re‑connect the cables
according to the wiring
diagram or replace the
cables.
2. The servo drive U/V/W
cables or the encoder cable
is disconnected.
Check the wiring.
Reconnect one end of the
power cables to the U, V,
and W terminals of the servo
drive and the other end to
those of the servo motor,
respectively. If necessary,
replace all cables and
ensure a reliable
connection.
3. The motor is stalled due
to mechanical factors.
Check the reference and
motor speed (H0b.00)
through the software tool or
keypad.
References in the position
control mode: H0b.13 (Input
position reference counter)
References in the speed
control mode: H0b.01
(Speed reference)
References in the torque
control mode: H0b.02
(Internal torque reference)
Check whether the reference
value is not 0 but the motor
speed is 0 rpm in the
corresponding mode.
Rectify the mechanical‑
related problem.
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