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7 Errors
34
Rev. 09/2022
Problem
Possible cause
Solution
Traverse range of the
fuel ring is too small/
too big.
A wrong VariFuel3 is con-
figured in the stepper motor
driver.
Configure your VariStep3 stepper
motor driver via the MICT. After-
wards, if necessary, adjust the fuel
ring (see
Adjust Fuel Ring
on
Fuel ring scale is not in
the inspection window.
Home position lost.
See
Adjust Fuel Ring
on page 39
POWER-LED of the step-
per motor driver does
not light up although it
is connected to the sup-
ply voltage.
Stepper motor driver is
defective.
Replace the stepper motor driver.
Stepper motor does not
move without interrup-
tions.
There is
no
malfunction. When the air/fuel ratio is correct, the
motor remains in its position.
7.3
Fix Shaft
All graphics used in this section represent an example of a VariFuel3 series 200-120.
To fix the shaft between stepper motor and VariFuel3, the stepper motor must be completely
dismounted. The explosion view provides information on how the stepper motor has been in-
stalled.