4 operation and setting 12, 1 manual operation of the actuator 12, 2 setting the additional equipment 12 – Samson Electri Actuator Type 3374 EB 8331-1 EN User Manual

Page 12: 1 limit contacts 12, 2 resistance transmitters 12, 2 setting the additional equipment, 1 limit contacts, 2 resistance transmitters

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

; 91/93 = 0

;

Actuator stem retracts:
81/83 = 0

; 91/92 = 0

EB 8331-1 EN

Operation and setting