Azbil Micro Flow MQV0002, Руководство пользователя

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1-5
Chapter 1. INTRODUCTION
•
PV display decimal point change (function setup
C-38
)
This function is used to shift the decimal point position of the instantaneous
flow rate display one digit left or right. When multiple devices are used side-by-
side, the number of digits after the decimal point of the flow rate display can be
made uniform.
•
Valve forcibly open or close (function setup
C-02
,
C-09
to
C- 12
)
This function is used to forcibly open or close the valve fully by key operation,
external contact input, or external 3-way switching input.
•
Automatic shut-off (function setup
C- 13
,
C- 16
)
The valve can be shut off automatically under the following conditions:
•
When the totalized flow count reaches the preset value.
•
When one of the alarms, including flow rate alarms, is triggered.
•
ALM (alarm) lamp ON/output/valve shut-off (function setup
C- 15
,
C- 16 C-20
)
The alarm output can be set for high and low deviations in the flow set value
and instantaneous flow rate. Additionally, an alarm judgment delay time can
also be set. If a flow rate alarm occurs or if an alarm occurs during self-diagnosis
of this controller, the valve can be forced fully closed or opened.
Handling Precautions
•
The valve on this device cannot completely shut off.
•
If complete shutoff is required, provide a shutoff valve separately.
•
Automatic reset of cumulative count at start of control function (function
setup
C- 14
)
Start of control and reset of totalized flow count can be done simultaneously by
a single action (by key or external switching input). Combining this function
with the automatic shut-off function described above is handy for shutting the
valve off in cases where a fixed totalized flow amount is counted repeatedly.
•
Analog scaling (function setup
C-28
)
This function is used to optionally change the flow rate (between 10 % FS and
100 % FS) corresponding to 100 % FS analog input/output (5 V or 20 mA).
•
Analog input (flow set value) range selection (function setup
C-05
,
C-09
)
In analog setup, the desired input range can be selected from those shown below
either by key operation or by external 3-way switching input. When doing so,
the voltage input and current input are selected automatically, as they are linked
with the settings of function setup
C-06
(analog output type selection). For
example, when the voltage output (0 to 5 V or 1 to 5 V) is selected in
C-06
,
the voltage input is selected automatically. Likewise, when the current output
(0 to 20 mA or 4 to 20 mA output) is selected, the current input is selected
automatically.