Azbil Micro Flow MQV0002, User Manual

Page: 43 / 94

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 equation
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 resistor with dial).
In this case, no external power supply for setup is needed. The reference voltage (5 V) is not accurate, 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 optional scaling function
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.