Owner's manual

2. Disconnect increasing signal supply air hose
(1, Figure 3-l) from 90 elbow (3) at bottom
of cylinder (4).
3. Disconnect decreasing signal supply air hose
(2) from 90” elbow (3) at top of cylinder (4)
and connect to 90” elbow at bottom of
CYli"dB.
4. Connect increasing signal supply air hose (1)
to upper cylinder 90” elbow (3).
5. Slowly open supply air shut off valve.
6. Slowly move piston to bottom of travel by
increasing input signal and sending 100%
signal pressure to power positioner.
7. Loosen set screw (15) securing spring socket
(16) in place.
8. Turn spring socket (16) slowly clockwise
until piston moves away from bottom of its
travel.
9. Turn spring socket (16) slowly
counterclockwise until piston just ret”r”s to
bottom of travel.
10. Lock spring socket (16) in place by
tightening set screw (15).
11. Using a grease pencil, make a reference
mark on piston rod (17) at top of packing
plate (18).
12. Slowly move piston to top of travel by
decreasing input signal and sending 0%
signal pressure to power positioner.
13. Measure distance from top of packing plate
(18) to reference mark on piston rod (17)
made in step 11.
14.
15.
16.
17.
18.
19.
If distance measured in step 14 is less than
5 inches, “se the following procedure to
calibrate piston travel.
Loosen lock screw (5) and adjustment
screw (6).
Move cam (8) in slightly (about l/64
inch).
Tighten adjustment screw (6) and lock
screw (5). Repeat steps 13 and 14 as
necessary to make. total piston h;lvel
equal to 5 inches.
Observe piston travel while increasing input
signal to 100%. Slowly decrease input signal
to 0%. If piston reaches bottom of have1
before input signal reaches 0%, “se the
following procedure to calibrate piston
travel.
Loosen lock screw (5) and adjustment
screw (6).
pull cam (8) slightly outward (about
1164 inch).
Tighten adjusbnent screw (6) and lock
screw (5). Repeat step 15 as necessary
to make piston reach bottom as signal
input reaches 0%.
Remove increasing signal supply air hose (1)
from 90” elbow (3) at top of cylinder (4).
Remove decreasing signal supply air hose
(2) from 90” elbow (3) at bottom of cylinder
(4) and to 90” elbow at top of cylinder.
Connect increasing signal supply air hose (1)
to 90” elbow at bottom of cylinder (4).
Close bypass valve (10).