Samson 3374, Mounting And Operating Instructions

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5.3 Digital positioner
An appropriate actuator board, TROVIS-
VIEW software for 3374 as well as a con-
necting cable (order no. 0450-1978) are re-
quired to retrofit the digital positioner.
If the actuator is not already equipped with
limit switches, the basic unit (order no.
1400-8829 ) is also required. The unit inclu-
des the spindle gear (2) and the intermedia-
te gear (5).
Note! Actuators with a digital positioner
cannot be equipped with potentiometers!
1. Remove the fastening screws. Push the
actuator board (1) from its guiding to
the right. Take out the board and re-
place it with a board with positioner.
2. Clip the spindle gear (2) onto the
sleeve (3) as illustrated in Fig. 7, top.
Make sure the lateral latch is properly
engaged in the groove of the sleeve.
3. Plug intermediate gear (5) onto the
spindle (4). Place the serrated ring (10)
on top and push it down until it will not
go any further.
4. The gear (12) on the feedback poten-
tiometer, which is equipped with a re-
taining ring, must be put onto its shaft
corresponding with the rated travel of
the control valve.
The rated travel inscription “Nennhub
15“ (on the upper side with the retain-
ing ring) or “Nennhub 30“ (lower side)
must be legible from above (also see
Figs. 4 and 5).
5. Push the actuator board (1) back into its
guiding. Make sure that the gears are
properly engaged. Fasten the board
using screws.
6. To calibrate the positioner, proceed as
described in section 4 of EB 8331-2 EN.
Adjust the positioner as described in sec-
tion 4.3.
Fig. 9
⋅
Version with positioner,
top: without; bottom: with limit switches
5 Intermediate gear
6 Contact cam
7 Cam bracket
8 Adjustment gears
10 Serrated ring
12 Gear feedback potentiometer
8 7 5 10 12
EB 8331-1 EN
19
Digital positioner