4-3
Chapter 4. BASIC 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
1
00.0
[ %]) is
indicated on the 7-segment display.
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.
Handling Precautions
•
The valve amperage can vary greatly according to the differential
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 relationship
between the valve amperage and flow rate has hysteresis characteristics
(amperage may vary even at the same flow rate).
When using the valve amperage alarm, be sure to test sufficiently under
operating conditions. That way, an appropriate alarm current setting can
be determined.
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