5 Installation Instructions
Rev. 09/2022
29
–
Mixture outlet
Connection via a bolt hole circle for engine specific mounting flange
(available with
clamp, seal and counter flange)
–
Impulse line connection
Connection for the impulse line of the balance or zero pressure regulator for connection to
the air inlet of the VariFuel3 (cutting-ring connection). For optimum performance in accord-
ance with its design, the VariFuel3 must be operated with a balance or zero pressure regu-
lator (see section
Assembly
on page 24). The connection is suitable for hoses with an outer
diameter of 10 mm (0.4").
–
Optional:
Gauge port
Connection for the measuring lead of a pressure gauge to measure the gas pressure at the
gas inlet of the VariFuel3. The connection is suitable for hoses with an inner diameter of
8 mm (0.31").
5.2.3
Connect Stepper Motor Driver
Risk of destruction!
To rule out the possibility of moving the connected VariFuel3 out of the con-
trol area, observe the following procedure when connecting the stepper
motor to the VariStep3 stepper motor driver:
1.
Configure the VariStep3 stepper motor driver for the desired VariFuel3
gas mixer (see section
External Device
in the operating manual of the
VariStep3 stepper motor driver).
2.
Disconnect the VariStep3 stepper motor driver from the power supply.
3.
Connect the stepper motor of the VariFuel3 gas mixer to the stepper
motor driver.
4.
Connect the VariStep3 stepper motor driver again to the power supply.
▸
The VariStep3 stepper motor driver initiates a reference run. The
VariStep3 stepper motor driver is ready for operation.
To connect the VariStep3 stepper motor driver to the stepper motor
of the VariFuel3, read
the operating manual of the VariStep3 stepper motor driver.
