-16-
9.7 (continued)
The current values of the control loop can be viewed at any time, however, to change these
values, a specific key sequence must be entered first. To unlock the control loop values,
press the keys F2, F1, and ENTER in that order. A small arrow will appear next to the value
to be changed. Use the arrow keys to change the value and the ENTER key to accept the new
value. As the ENTER key is pressed, the controller will begin controlling to that value and the
cursor advances to the next value. To disable the optional automatic control and force the
controller output to a particular value after unlocking the control, press the F1 key. The display
will indicate that the unit is in MANUAL and the current value of the output. Use the UNITS
arrow keys to change the setpoint value.
F2
press to
unlock
values
F1
followed
by
ENTER
followed
by
CH30/90 42.3 PSIG
SETPOINT ÷ 42.2 PSIG
P:45% I: 1s D:450m
AUTO 58%
UNITS
press to
change
value
ENTER
to accept
new
value
CH30/90 42.3 PSIG
SETPOINT 42.2 PSIG
P:45% I: 1s D:450m
MANUAL ÷ D 58%
F1
press to
change
mode
UNITS
press to
change
value
The second control loop, CONTROL LOOP #2, is accessed by pressing the NEXT key twice
from the HOME screen. CONTROL LOOP #2 is a second independent PID loop (like LOOP
#1) and can be programmed to control based upon the analog input of Channel 31. In addition
to controlling the 4-20 mA output, based upon the channel 31 analog voltage, a closed loop
control of the input frequency being measured by the RPM input Channel 46 is also possible.
The selection of which channel acts as the control input is made when programming the unit
from the PC Terminal program. In order to change the tuning values for LOOP #2 from the
LOOP #2 screen, the same key sequence as for LOOP #1 is used.
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