Samson 3277-5 Mounting And Operating Instructions page 48

Servicing and conversion
the vent plug (A16) from the top signal
pressure connection and screw it into the
bottom connection (S).
Type 3277-5: connect the signal pres-
sure as described in 'Pneumatic connec-
tion' in the 'Installation' section.
The actuator springs, which now push
against the diaphragm plate from below,
cause the actuator stem to retract. The
signal pressure is connected to the top
connection (S) on the top diaphragm
case. As a result, the actuator stem ex-
tends opposing the spring force as the
signal pressure increases.
12. Affix a new nameplate with changed
symbol and new configuration ID to the
actuator.
b) Reversal of the direction of
action from stem retracts to
stem extends
1. Lift off the top diaphragm case (A1).
2. Pull the actuator stem (A7) together with
the diaphragm plate (A5.1), diaphragm
(A4) and diaphragm plate (A5.2) out of
the bottom diaphragm case (A2).
3. Remove the springs (A10).
4. Unscrew the collar nut (A15).
NOTICE
!
Malfunction due to loosened nut.
The nut (A9) on the actuator stem serves to
adjust the dimension a.
Î Do not undo the nut (A9).
9-8
Î If the nut has been loosened, readjust the
dimension a as specified in Table 9-1.
5. Remove the diaphragm plate (A51), dia-
phragm (A4) and diaphragm plate
(A5.2) from the actuator stem (A7) and
place them back on again in the reverse
order.
6. Tighten the collar nut (A15).
7. Apply a suitable lubricant to the actuator
stem (A7).
8. Place the actuator stem (A7) together
with the diaphragm plate (A5.1), dia-
phragm (A4) and diaphragm plate
(A5.2) in the bottom diaphragm case
(A2).
9. Place the springs (A10) in the bottom di-
aphragm case (A2), centering them in
the intended recesses.
10. Place on the top diaphragm case (A1).
11. Fasten the top and bottom diaphragm
cases (A1, A2) together using the nuts
(A21) and bolts (A20). Observe tighten-
ing torques.
12. Type 3271-5: connect the signal pres-
sure as described in 'Pneumatic connec-
tion' in the 'Installation' section. Unscrew
the vent plug (A16) from the bottom sig-
nal pressure connection and screw it into
the top connection (S).
Type 3277-5: connect the signal pres-
sure as described in 'Pneumatic connec-
tion' in the 'Installation' section.
The actuator springs, which now push
against the diaphragm plate from above,
cause the actuator stem to extend. The
EB 8310-1 EN