Alicat VC Series Volumetric Flow Controller User Manual
Page 19
19
Select Menu Mode
Pushing “Mode” once will bring up the “Select Menu” display (Figure 7, page 11). Push the button
nearest your selection to go to the corresponding screen. Push “Mode” again to return to the Main
Mode display. (
Note: If your controller was ordered with Totalizing Mode option (page 43), pushing the
“Mode” button once will bring up the “Totalizing Mode” display. Pushing “Mode” a second time will bring
up the “Select Menu” display.)
Control Setup Mode
The Control Setup Mode is accessed by pressing the center button above “Control” on the Select Menu
Display (Fig.7 page 11) This mode allows the user to set up most parameters commonly associated with
PID control. Alicat Scientific flow controllers allow the user to select how the set-point is to be conveyed
to the controller, what that set-point is if control is local, and what the Proportional and Differential terms
of the PID control loop will be. The UP and DOWN buttons for adjusting variables can be held down for
higher speed adjustment or pressed repeatedly for fine adjustment
Select Loop Input
>P 200 >Analog
D 500 Volume Serial
AUT0on
Local
Set 0.00
Control
Up Down Setup
Figure 14. VC Series Control Setup Display
Input – VC Series Flow Controllers normally ship defaulted to analog control as indicated in Figure 14
above. To change how the set-point will be conveyed to the controller push the button in the upper right
hand corner just above the dynamic label “Input” until the arrow is directly in front of the desired option.
The controller will ignore any set-point except that of the selected input and it will remember which input
is selected even if the power is disconnected.
Analog refers to a remote analog set-point applied to Pin 4 of the Mini-DIN connector as described
in the installation section of this manual. To determine what type of analog set-point your controller
was ordered with, refer to the Calibration Data Sheet that was included with your controller. 0-5 Vdc
is standard unless ordered otherwise. Note that if nothing is connected to Pin 4, and the controller is
set for analog control, the set-point will float.
CAUTION! N
ever
leave
a
C
oNtroller
with
aNy
NoN
-
zero
set
-
poiNt
if
No
pressure
is
available
to
make
flow
. t
he
CoNtroller
will
apply
full
power
to
the
valve
iN
aN
attempt
to
reaCh
the
set
-
poiNt
. w
heN
there
is
No
flow
,
this
CaN
make
the
valve
very
hot!