Samson Electri Actuator Type 3374 EB 8331-1 EN - Manual (Page 17)

Setting with limited travel range
Travel calibration is usually based on the
maximum travel of the valve.
If, however, the maximum possible travel is
to be limited to a smaller travel end value,
press the button (4) once at the start of cali-
bration while the signal lamp blinks for
10 seconds. As a result, travel calibration
via the potentiometer gear with rated travel
15 or 30 is limited to 6 mm. Each time the
button is pressed, the travel range is in-
creased by 1 mm.
If, for example, a valve designed for 15 mm
is to be operated with a limited travel range
of 10 mm, press the button (4) five times
during the 10 second time limit. The top sig-
nal lamp (8) flashes each time the key is
pressed.
Reporting defined events
At the binary output (terminal 83 and 84),
predefined events can be indicated (see
EB 8331-2 EN) during positioner operation
and transmitted to a control room.
5 Retrofitting additional
electrical equipment
CAUTION!
When installing electrical equipment, make
sure the power supply and the signal input
are disconnected. Only use power interrup-
tion devices which are protected against un-
intentional reconnection of the power sup-
ply.
Note: We recommend to apply a small
amount of lubricant (e.g. Vaseline) to the
spindles on the gear faces and to the sides
of the cogs.
The actuator can be subsequently equipped
with two limit contacts, two resistance trans-
mitters or a digital positioner.
Depending on the actuator version used, the
actuator PCB needs to be replaced as well
(see sections 5.2, 5.3 and 5.4).
The actuator version is marked on the name-
plate, e.g. Var.-ID 1063729.
When ordering additional electrical equip-
ment from the manufacturer, include this
model number in the order.
To install the limit contacts, resistance trans-
mitters or a digital positioner, the basic unit
(1400-8829) is required.
EB 8331-1 EN
17
Retrofitting additional electrical equipment