Future Design MCT-MC 4.3, Руководство пользователя

Страница: 55 / 186

MCT-MC
4.3
Basic Operation - 55 - FDC MCT-MC
5.5 Control Loops (Single Set point Operation)
The Loop view screen provide direct viewing options for the control and monitoring of the MC control loops.
The Loop screen allows the user to adjust the current loop set point (SP) and view the process variables (PV)
and percentages of output (%) for each loop (when viewing up to 5 loops).
5.5.1 Loop View
The Loop screen is accessed from the home “View” menu. It can display from 1 to the maximum number of
loops configured in the system. The maximum loops that can be viewed on the screen is determined by the
“Loops to View” setting on the Navigation screen (see section 9.6).
The
set point entry field is the area where the screen can be touched in order to bring up the keypad entry
window. Using the numeric entry keypad, a new set point can be entered. Once entered, the new set point will
be shown in the set point entry field. Adjustment of the set point is locked out if an automated ramp/soak
program is running.
IMPORTANT: When operating in single set point mode, the set point is saved in the loop control board’s
memory once every 6 minutes. If the set point is changed and power is removed prior to the 6
minute time period, when power is re-applied, the loop set point will return to the previous value.
Insure that power remains on the unit for 6 minutes after a set point change in order to have it
power-up with the desired set point the next time power is applied.
The
percent output entry field is the area where the screen can be touched in order to bring up the keypad
entry window. Using the numeric keypad, a new fixed percentage of output can be set for the loop. In order to
be able to enter a fixed output percentage, the loop must first be placed in manual output mode. This is done
by pressing the “%” tag on the screen. This feature can be removed by turning off the “Loop Manual Mode”
function in the Configurator.
NOTE: If more than 5 loops are shown on the loop view screen, the percent output fields are removed from
view in order to display additional loop information. Manual mode operation for each loop can still
be accessed from the Tuning screen (see section 9.1).
The
loop name and loop units , shown at the bottom of each loop (or limit), will display the tagname and units
as entered in the Configurator.
Set Point Entry
Field
Loop Units
Loop Name
Press PV value
for historical
min/max.
Press PV tag to
reset historical
min/max.
Press % tag to
enable/disable
manual output.
Percent Output
Entry Field