4 Operation and adjustment
4.1 Manual operation of the actua-
tor
To operate the manual override, place
4 mm hex wrench on the red actuator shaft
located at the side of the housing.
The hex wrench is delivered with the actua-
tor. It is attached to the bottom side of the
housing.
4.2 Adjustment of additional equip-
ment
To access the additional equipment, un-
screw the four fixing screws and take off the
cover.
Adjust while the power is switched
on!
4.2.1 Limit switches
1. Use motor or manual override to move
the control valve to the position where
the switching function is to be activated.
2. Use hex wrench to turn spindle (2) for
the upper limit switch or spindle (3) for
the lower limit switch until the associ-
ated contact cam on the cam
bracket (7) triggers the switch contact of
the upper or lower microswitch (1).
4.2.2 Potentiometers
The gears of the potentiometers (12) and
(13) must be put onto their shafts corre-
sponding with the rated travel of the control
valve. The rated travel inscription “Nenn-
hub 15“ or “Nennhub 30“ must be legible.
If this is not the case, pull each poten-
tiometer gear off the shaft and put it back
on again with the reverse side of the wheel
facing upwards, ensuring it is aligned
roughly flush with the potentiometer shaft.
Zero point adjustment
1. Use motor or manual override to move
the control valve to the desired end posi-
tion.
2. Place screwdriver on the slotted poten-
tiometer shaft (12.1 and 13.1).
3. Adjust resistance value with a con-
nected ohmmeter by turning the corre-
sponding potentiometer shaft.
10
EB 8331-1 EN
Operation and adjustment
Summary of Contents for 3374
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