Jordan Valve Mark 4150 Series Pressure Controllers - Manual (Page 3)

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Proportional-Reset Controllers
1. The air supply should be connected to Bellofram
Mark 50 filter regulator.
2. Connect the control pressure line and open the
lock shield needle valve.
3. Ensure all piping and connections are free from
leaks.
4. Set pressure to the desired control point.
5. Proportional band should be set at 100% of
bandwidth.
6. Maximize the setting on the reset dial.
7. Open the manual control valves that are up
stream and downstream, at the same time close
by-pass valves.
8. Set the controller near the desired control point.
When it reaches that point, begin to narrow
the proportional band until a cycling condition
exists. Broaden the band slightly until a stable
condition is reached. There is no need
to reset the zero in controllers that have reset.
9. Try to obtain the fastest reset time without intro
ducing cycling control carefully by adjusting the
reset rate.
10. Test the bandwidth and the reset rate by chang-
ing the pressure setting adjustment for
a moment. If this causes cycling, then broaden
the proportional band and test again. This
procedure is to be repeated until stability is
reached.
The goal for the controller setting is to have the narrow-
est proportional band and the fastest reset rate that will
not cause cycling.
Changing Controller Action
One advantage of the Mark 4150/4160 is the ease at
which you can change from one mode of control to an-
other. There is a connection for both direct and reverse
action in all modes of control. There is also a screw (key
5, figure 6) provided to plug the hole opposite of the
nozzle. It will be necessary to follow INITIAL SETTINGS
after any change in mode of control.
Adjustments
Proportional Band Width Adjustments
The proportional band width adjustment determines the
change in control pressure required to cause the control
valve to travel full open or full closed.
Example: with the proportional band set @ 1 (10%),
using a Bourdon tube of 0-1000 psi that is set @ 500 psi
on the pressure dial. The full travel of the valve would
occur between 450 psi (3 psi output) and 550 psi (15 psi
output) to try to maintain the set point.
Using this theory, an input pressure of 500 would give
you an output pressure of 9 psi. The greater the propor-
tional band setting is the slower the reaction.
Figure 1: Pressure Connections for
Proportional Controller
Figure 2: Pressure Connections for
Proportional-Reset Controller
Reset Rate Adjustment
By definition the reset rate is the number of minutes that
it takes to adjust the controller to adjust the output pres-
sure up or down by the same amount of proportional
change output caused by the process change.
The reset rate is calibrated in minute per repeat.
M
ark
4150
and
4160 S
erieS
P
reSSure
C
ontrollerS