Samson 3374 Mounting And Operating Instructions - page 14
After pressing the calibration button (4), the
actuator stem first extends to the closing po-
sition of the valve as far as it will go. Cali-
bration is concluded when both signal
lamps (8 and 9) are lit.
Travel calibration starts after the mounting
position of the potentiometer gear (12) was
determined automatically. This is indicated
by signal lamp (8) for 6 to 35 mm travel
and by signal lamp (9) for 6 to 20 mm
travel.
When travel calibration starts, the lower sig-
nal lamp (9) blinks quickly for about 10 sec-
onds.
The actuator stem retracts as far as it will go
(maximum travel - valve open).
Travel calibration is concluded when the
end position is reached. The actuator is in
control operation. The actuator stem moves
to the valve position determined by the refer-
ence variable.
Note!
If one of the signal lamps starts to blink
slowly after the travel calibration button was
pressed and the actuator stem has extended
to its closing position, the poten-
tiometer (13) has been wrongly positioned.
Readjust it manually.
Do not adjust the potentiometer before the
closing position is actually reached. This is
indicated by the associated, activated limit
switch on the board (Fig. 5 on page 11).
To proceed, adjust the shaft of the poten-
tiometer (13) by turning it gradually clock-
wise or counterclockwise with a screwdriver
until the signal lamp stops blinking and is
constantly illuminated.
Turn the screwdriver counterclockwise if the
upper signal lamp (8) blinks, and clockwise
if the lower signal lamp (9) blinks, corre-
sponding to the icons (7).
Travel calibration does not continue before
both signal lamps are illuminated at the
same time.
Note!
If both signal lamps start to blink simulta-
neously during travel calibration, interrupt
calibration by pressing the travel calibration
button (4) and check the mounting position
of the potentiometer gear (12) again.
If no travel motion can be determined dur-
ing calibration, e.g. due to a loose or mis-
sing potentiometer gear, both signal lamps
blink alternately.
If this is the case, interrupt travel calibration
by pressing the button (4), correct the error,
and restart calibration by pressing the but-
ton (4) again.
14
EB 8331-1 EN
Setting the digital positioner