Samson Electri Actuator Type 3374 EB 8331-1 EN - Manual (Page 16)

After pressing the travel calibration but-
ton (4), the actuator stem first moves as far
as it will go to the valve's CLOSED position.
Calibration is in progress when both signal
lamps (8 and 9) are lit.
Travel calibration starts after the mounting
position of the potentiometer gear (12) has
been determined automatically. This is indi-
cated by signal lamp (8) for 6 to 35 mm
travel and by signal lamp (9) for 6 to
19 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 successfully completed
when the end position is reached. The actu-
ator is in closed-loop operation. The actua-
tor stem moves to the valve position deter-
mined by the input signal.
NOTICE
If one of the signal lamps starts to blink
slowly after the travel calibration button has
been pressed and the actuator stem has ex-
tended to the valve's CLOSED position, the
potentiometer shaft (12.1) has been wrongly
positioned. Remount it manually.
Do not adjust the potentiometer before the
closed position is actually reached. This is
indicated by the associated, activated switch
on the board (Fig. 5 on page 13).
To proceed, adjust the shaft of the potenti-
ometer (12.1) 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, corresponding to the icons
(7). Travel calibration does not continue until
both signal lamps are illuminated at the
same time.
NOTICE
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 during
calibration, e.g. due to a loose or missing
potentiometer gear, both signal lamps blink
in alternating sequence.
If this is the case, interrupt travel calibration
by pressing the button (4), correct the fault,
and restart calibration by pressing the but-
ton (4) again.
16
EB 8331-1 EN
Operation and setting