Azbil Micro Flow MQV0005, User Manual

Page: 43 / 90

4-9
Chapter 4. BASIC OPERATION
„
Analog flow rate setup
The SP value (flow set value) can be changed by analog voltage by
selecting analog setting as the flow rate setting method in function
setup
C-03
. For details on how to set up the function, Chapter 5.
ADVANCED OPERATION.
The setup voltage/current range can be selected in the input range
selection for analog setup (
C-05
in the function setup).
The selection of voltage input/current input is linked automatically
with the settings for analog output type and range selection (
C-06
in the function setup). For example, when current output is selected
as analog output type and range selection in
C-06
, the input type
becomes current input type. Then, analog setup voltage/current for SP
value can be calculated by the equations below.
Function
setup
C-05
Input voltage/current range Setup voltage/current calculation
0 Internal reference 0 to 5 V*/
External reference 0 to 20 mA Setup voltage [V] = Setting flow rate ÷ Full-scale flow rate x
Reference output voltage
Setup current [mA] = Setting flow rate ÷ Full-scale flow rate x 20
1 External reference 0 to 5 V/
External reference 0 to 20 mA Setup voltage [V] = Setting flow rate ÷ Full-scale flow rate x 5
Setup current [mA] = Setting flow rate ÷ Full-scale flow rate x 20
2 External reference 1 to 5 V/
External reference 4 to 20 mA Setup voltage [V] = Setting flow rate ÷ Full-scale flow rate x 4 + 1
Setup current [mA] = Setting flow rate ÷ Full-scale flow rate x 16 + 4
* Internal reference 0 to 5 V input means that the 5 V-reference voltage input of connector pin No.
20 of this controller is used and a voltage is input with the optional potentiometer (variable resis-
tor with dial).
In this case, no external power supply for setup is needed. The reference voltage (5 V) is not ac-
curate, so to actually measure and calculate the reference voltage output from this controller, use
a voltage tester for the setup voltage calculation.
Note (Advanced use)
•
When "1: Function enabled" is selected for analog scaling func-
tion
C-28
in the function setup, the full scale flow rate can be
changed to a desired level during analog setup. In this case, the
full-scale flow rate of the analog flow rate output voltage/current
(PV output voltage/current) is also changed as it is linked with
the above flow rate. The scaling flow rate is set in the parameter
setup mode. For details on how to set up functions, Chapter
5. ADVANCED OPERATION.