Azbil Micro Flow MQV0005, Руководство пользователя

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4-3
Chapter 4. BASIC OPERATION
•
Totalized flow event automatic valve shut-off function
When "1: Function enabled" is set for the automatic valve shut-off
function in function setup
C- 13
, the valve will be automatically
closed fully if the totalized flow value reaches the preset value.
The threshold value for the totalized flow event is set in the param-
eter setup
mode.
For details on function setup and parameter setup,
Chapter 5. ADVANCED OPERATION
z
Valve amperage display
If [DISP] key is pressed while the totalized flow is displayed, the PV ,
SP
,
L
and
L/min lamps
go out, and the electrical current to the valve
(
0.0
to
100.0
[%] ) is indicated on the 7-segment display.
Handling Precautions
•
The valve amperage can vary greatly according to the differen-
tial pressure even at the same flow rate. The valve amperage
alarm function cannot be used unless the differential pressure
is stable.
•
Even under stable differential pressure conditions, the rela-
tionship between the valve amperage and flow rate has hys-
teresis characteristics (amperage may vary even at the same
flow rate).
When using the valve amperage alarm, be sure to test suf-
ficiently under operating conditions. That way, an appropriate
alarm current setting can be determined.
Note (Advanced operation)
• When "1: Only upper limit alarm used," "2: Only lower limit
alarm used," or "3: Upper and lower limit alarm used" is selected
for valve amperage alarm type (
C-20
in the function setup),
the valve amperage alarm will be activated if the valve current
exceeds the upper limit set value or goes below the lower limit
value. The valve amperage upper and lower limits are set in the
parameter setup mode.
For details on function setup and parameter setup, Chapter
5. ADVANCED OPERATION