Samson foundation 3787, Монтаж и эксплуатация, Страница: 10 / 96

2 Attachment to the control valve
The positioner can be attached either di-
rectly to a SAMSON Type 3277 Actuator
or to control valves with cast yokes or rod-
type yokes according to IEC 60534-6
(NAMUR).
In connection with an intermediate piece,
the positioner can also be attached to rot-
ary actuators.
Since the standard positioner is delivered
without accessories, please refer to the
tables for required mounting parts and their
order numbers.
Note!
For fast control valves with small travel vol-
umes (transit time < 0.6 sec.), replace the fil-
ter in the signal pressure output with a
screw-in throttle, if necessary, to improve
the control properties. See also sections
2.1, 2.2 and 2.3.
Important!
The positioner does not have its own vent-
ing plug, instead vented air has to escape
through venting plugs located on the mount-
ing parts (see Figs. 3, 5 and 7).
A filter check valve for the vented air is in-
cluded in every positioner delivery (under
the transparent protective cap on the back
of the positioner). Replace the standard vent-
ing plug included in the accessories with
this filter check valve. This is the only way to
achieve the degree of protection IP 65 by
preventing dirt and moisture from entering
the device.
2.1 Direct attachment to Type
3277 Actuator
The necessary accessories are listed in the
Tables 1, 2 and 3 on page 13
.
When looking at the signal pressure connec-
tion or the switchover plate (actuator 120
cm
2
), the positioner must be attached to the
left side of the actuator.
The
arrow on the black cover of the case
(Fig. 11) should point towards the dia-
phragm chamber .
Exception: Control valves in which the plug
closes the seat area when the actuator stem
retracts. In this case, the positioner has to
be attached to the right side of the actuator
and the arrow points away from the dia-
phragm chamber.
1. Screw the clamp (1.2) to the actuator
stem, ensuring that the fastening screw
is located in the groove of the actuator
stem.
2. Screw the assigned pick-up lever D1 or
D2 to the transmission lever of the posi-
tioner.
3. Fasten the distance plate (15) with seal
pointing towards the actuator yoke.
4. Place the positioner on the plate so that
the lever D1 or D2 slides centrally over
the pin of the clamp (1.2). Then screw
tight to the distance plate (15).
5. Mount cover (16).
Actuators with 240, 350 and 700 cm
2
6. Check whether the tongue of the seal
(17) is properly aligned at the side of
the connection block (Fig. 3, center)
10
EB 8383-1 EN
Attachment to the control valve