User Guide

6 T-5800-1/T-5800-2 Technical Bulletin
normal proportional plus integral
control of the system at all
times, provided that the P/PI
jumper is connected.
Set Point Adjustment
To make adjustments to the set
point, proceed a follows:
1. Pull the P/PI jumper off of
its spigot so that the
receiver-controller will
operate as a proportional-
only controller (no integral
function).
2. Consult the system drawing
to determine the required
set point value. Convert
this value to the pressure
equivalent; see example
highlighted in Fig. 10 (75°F
on a 50 to 150°F range
would be a set point of
6 PSIG).
3. Take a set point pressure
reading using the appropriate
method and gage, as
illustrated in Fig. 8. Adjust the
local set point dial or the
remote adjuster (manual or
automatic) until the pressure
matches the value noted in
Step 2. Remove the pressure
reading device and reconnect
the jumper (if applicable).
4. Start up the system to be
controlled. After a
reasonable period of time,
the receiver-controller should
be in control (as a
proportional-only controller)
within the throttling range of
the controlled device.
5. Proceed to the Gain
Adjustment section.
Gain Adjustment (See Fig. 14)
Note: All gain adjustments
must be made with the P/PI
jumper still removed from the
spigot.
Adjusting the gain dial will not
affect the controller set point;
however, the output pressure
may change when the gain dial
is adjusted. Increasing the gain
will narrow the throttling range
(decrease offset), allowing the
control point to be closer to the
set point. Decreasing the gain
will widen the throttling range,
forcing the control point away
from the set point.
Normally, having the gain arrow
set at the pointer represents a
reasonable gain adjustment
which would provide stability.
Increase the gain setting by
small increments until the
system becomes unstable and
begins to cycle. Decrease the
gain setting slightly to remove
the cycling effect and mark this
position on the dial. Rotate the
dial fully clockwise until it hits its
mechanical stop, then
counterclockwise to the midpoint
between the stop and the
marked position. Doing so will
provide a suitable gain to allow
the introduction of the integral
function.
After the system stabilizes
again, reconnect the P/PI jumper
to return the integral function to
the receiver-controller. After a
reasonable period of time, the
control point should stabilize at
the set point value and no
further adjustments will be
required. If the control point
does not stabilize at the set
point value or if excessive
cycling occurs, proceed to the
Integral Time Adjustment
section.
Integral Time Adjustment
(See Figs. 14 & 15)
Adjusting the integral time dial
will not affect the controller set
point. If the system response
toward the set point is too slow,
decrease the integral time
and/or increase the gain dial
settings by small increments
each. If cycling occurs,
increase the integral time and/or
decrease the gain dial settings
by small increments each.
Mark the set point dial position.
Upset the system by rotating the
set point dial to force the
controlled device to an open
position. Wait a sufficient period
of time to cause controlled
variable deviation, then return the
set point dial to its original
position. If the system response is
not as desired, adjust the