Future Design MCTB 4.3, Руководство пользователя

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MCTB
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5.5 Control Loops (Single Set point Operation)
The Loop view screen provide direct viewing options for the control and monitoring of the MCTB control loops
and limit control (if configured). 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.
5.5.1 Loop View
The Loop
screen is accessed from the home “View” menu. It automatically configures itself to display from one
to three loops or up to two loops and limit control based on the configuration of the MCTB.
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 and event selections are saved 15
seconds after the last entry is made. If the set point or event selections are changed and power
is removed prior to the 15 second time period, when power is re-applied, the loop set point and
event selections will return to the previous value. Ensure that power remains on for 15 second
interval after an entry is made in order to have it power-up with the desired set point and event
selections 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.
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.
5.5.1.1
Ramp Rate Operation (MCTB 4.3” version 4MA V1.3 only)
When a loop is configured for ramp rate operation, the “SP” label will provide additional status for the loop in
regards to whether the set point is ramping up, down, or is stable at the target set point. This is accomplished
by providing a direction arrow (up or down) to indicate which direction the set point is ramping. Once the set
point has reached its target, a bidirectional arrow will be shown to indicate the set point has reached its target.
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