Samson Electri Actuator Type 3374 EB 8331-1 EN - Manual (Page 12)

4 Operation and setting
4.1 Manual operation of the
actuator
To operate the manual override, place a
4 mm hex wrench on the red actuator shaft
located at the side of the housing. The hex
wrench is included in the scope of delivery.
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 ac-
tuator 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 contacts
1. Use motor or manual override to move
the valve to the position where the
switching function is to be activated.
2. Use a hex wrench to turn spindle (2) for
the upper limit contact or spindle (3) for
the lower limit contact 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 Resistance transmitters
The gears of the potentiometers (12) and
(13) must be put onto their shafts to
correspond with the rated travel of the valve.
The rated travel inscription 'Nennhub 15'
(or B) or 'Nennhub 30' (or A) must be legi-
ble. If this is not the case, pull both potenti-
ometer gears off their shafts and put them
back on again with the reverse side of the
wheel facing upwards, ensuring they are
aligned fairly flush with the potentiometer
shaft.
Zero point adjustment
1. Use motor or manual override to move
the valve to the desired end position.
2. Place a screwdriver on the slotted poten-
tiometer shaft (12.1 and 13.1).
3. Calibrate resistance transmitter using the
connected ohmmeter correspondingly:
Actuator stem extends:
81/82 = 0
W ; 91/93 = 0 W ;
Actuator stem retracts:
81/83 = 0
W ; 91/92 = 0 W .
12
EB 8331-1 EN
Operation and setting