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4 Operation and setting
4.1 Manual operation of the
actuator
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 actuator. It is
attached to the bottom of the housing.
Manual override is only possible in actua
-
tors with fail-safe action when the power
supply is connected (terminals N and L).
Set the selector switch (2, in Fig. 6) of the
actuator with positioner to the operating
mode 0 =.
4.2 Setting the additional
equipment
To access the additional equipment, unscrew
the four fixing screws on the cover using a
Pozidrive PZ2 screwdriver to provide
enough hold on the screw heads. Take off
the cover.
After completing the settings and establish
-
ing the electrical connection, refasten the
cover. To proceed, place back on the cover
and screw the cover screws in slightly to po
-
sition the cover before tightening them prop
-
erly.
Perform settings 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 associated
contact cam on the cam bracket (7) trig
-
gers 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 to
correspond with the rated travel of the con-
trol valve. The rated travel inscription
“Nennhub 15” or “Nennhub 30” must be
legible. If this is not the case, pull each po-
tentiometer 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 potenti
-
ometer shaft (12.1 and 13.1).
3. Calibrate potentiometer using the con
-
nected ohmmeter correspondingly:
Actuator stem extends:
81/82 = 0
Ω
; 91/93 = 0
Ω
;
Actuator stem retracts:
81/83 = 0
Ω
; 91/92 = 0
Ω
.
12 EB 8331-1 EN
Operation and setting