Siemens PS2 Installation And F.a.q page 25

POSITIONER SET UP &
Positioner Set Up (Continued)
7 Using the '+' & '-' Keys on the positioner, stroke the valve fully to the upper
& lower mechanical stops. Ensure there is no binding on the linkage and
everything moves freely (must be in Manual Mode, if you are in Programming
mode, press the 'HAND' Key for 5 seconds. Refer to Step 10 for more info).
8 FOR LINEAR VALVES:
Using the Sliding Clutch (Refer to Figure 15, Key 5. Class I Zone II model is on
the left, Class I Zone I on the right) turn this until the position ("P" Number)
display on the positioner reads between 5%-15% or 85%-95%. Then use the
'+' & '-' Keys to stroke valve to the opposite mechanical stop. Check what
percentage is displayed. Set this value opposite to the previous stop (e.g.: If
the upper stop limit was 85%-95%, set the lower stop limit between 5%-15%
or vice versa). Stroke the valve back to the opposite stop, and check what
percentage is displayed again. If it is not between 85%-95% or 5%-15%,
re-set the sliding clutch accordingly. Adjusting the sliding clutch will affect both
mechanical stops "P" number slightly.
a Note: The objective is to achieve between 5% -15% at one stop, and
85%-95% at the other without the "P" number wrapping around at the
upper or lower end of the scale. Repeat this process until both upper &
lower stops read correctly. Verify by stroking to mid-travel and check if
you are close to a 50% display. Once complete, leak test your tubing.
b Note: If the "P" number wraps around past 1 or 99 in either direction, the
resolution of the potentiometer must be adjusted. Loosening the nut on
the back side of the spring loaded button of the feedback arm assembly
(Refer to Figure 11, Key A), will allow lateral movement of the button. To
decrease the resolution, move towards the center of the Positioner. To
increase, move towards the outer edge. Move this in small increments, as
it has a signifi cant effect on the resolution. Try ¼" movements at a time.
This is a trial and error process, once you are able to stroke to both stops
"P" numbers as noted above, re-tighten the nut on the back side of the
spring loaded button.
c Note: If the positioner is not brand new and has already been used
before, you will need to clear its "memory" for Step 8 to work correctly.
The display reads 'NOINI' when it is new or has the memory cleared. If
the valve moves when you adjust the Sliding Clutch, clear the memory as
described in the next section.
d The Class I Zone II Sliding Clutch Wheel is fairly stiff and makes a ratchet
noise when moved. If the Sliding Clutch refuses to move at all, refer to
Step 9 and loosen the Sliding Clutch Lock. The Class I Zone I Positioner
Sliding Clutch Adjustment Wheel can be rotated using a small screw
driver, and is found on the output stem of the positioner (Figure 16).
Dyna-Flo Control Valve Services Ltd.
Phone: 780 469
•
CALIBRATION
4000 | Toll Free: 1
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866 396 2356 | www.dynafl o.com
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