OPERATING PROCEDURES
PROCESS DISPLAY
5 - 9
be to effect a change in set point or control output through the face-
plate.
Changing the Set Point - Ratio Station
If the controller is operating as a ratio station, the operations are the
same as a basic station.
1. The controller can be in manual, auto or bypass mode to change
the set point at the faceplate. If in
AUTO
and at the process display
screen, press and . The
SP
display will appear immediately in
the upper left hand corner of the display. If in
MAN
or
BYP
and
PV
or
CO
is displayed, press
until
SP
appears.
2. Use and to select the new set point. The value in the upper
right hand corner of the display will show the values ramping up or
down and the arrow to the right of the scale will move to follow the
new value.
During ratio operation, the multiplication constant for the process can
be modified by pressing and .
Changing the Control Output - Ratio Station
1. To adjust the control output at the faceplate, the controller must
be in manual or bypass mode (Table
). If in auto, refer to
. Press
until
CO
appears in the upper
left corner of the display.
2. Use and to select the new control output. The value in the
upper right hand corner of the display will show the values ramping
up or down and the CO bar graph will move right or left (up or down
on Type 2 display).
Table 5-4. Ratio Station - Adjusting
SP and CO from the Faceplate
Mode
Adjust Set Point
(SP)
Adjust Control Output
(CO)
Manual
Yes
Yes
Auto
Yes
No (change to MAN
or BYP)
Ratio
No
1
(change to AUTO,
MAN or BYP)
Bypass
Yes
Yes
NOTE:
1. For custom configuration users, the set point can be adjusted from the faceplate if
the ratio N+1 of S2 in function code 80 is adjusted.
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