Yokogawa RotaMASS 3-Series - Manual (Page 127)

APPENdIX 2. APPLICATION, SETTING ANd CHANGE OF BASIC PArAMETErS
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IM 01R04B05-00E-E 3rd edition July 30, 2010 -00 all Rights Reserved. Copyright © 2005, Rota Yokogawa
APPENdIX 2. APPLICATION, SETTING
ANd CHANGE OF BASIC PArAMETErS
A2.1 Applications and Selection of Basic Parameters
TA0201.EPS
Setting Item (applicable parameters) Summary
Calibration range setup
(XD_SCALE of AI block)
Output mode setup
(L- TYPE of AI block)
Output scale setup
(OUT_SCALE of AI block)
Simulation setup
(SIMULATE of AI/DI block)
Output signal low cut mode setup
(MASS_FLOW_LOW_CUT of
TB block)
Damping time constant setup
(MASS_FLOW_VALUE_FTIME of
TB block)
Tag numbers
LCD display setup
(DISP_PERIOD of TB block)
Set the physical (PD) tag and blocking tags. Up to 32 alphanumeric characters can be set
for each of these tags. refer to Section 5.4, „Setting of tags and Addresse“.
Sets the range of inputs from the transducer block corresponding to the 0% and 100%
points in operation within the AI1 function block. The maximumflow rate range on an order
sheet is the factoty default setting.
Set four data: the unit of the range, the input value at the 0% point (always for Rotamass),
the input value at the 100% point (equal to the flow span), and the decimal point position.
Set the scale of output corresponding to the 0% and 100% points in operation with the AI
function block. It is possible to set a unit, and scale that differ from the measuring range.
Set four data: the unit of the scale, the output value at the 0% point (i.e. the lower output
scale limit), the output value at the 100% point (i.e the upper output scale limit), and the
decimal point position.
Select the calculation function of each AI function block from the following:
- Direct:
The output function of the transducer block is directly output only via
filtering without scaling and square root extraction (in the range set in
XD_SCALE).
- Indirect: Proportional scaling is applied to the the input of AI function bloc, and the
result is output (in the range set in OUT_SCALE).
-IndirectSQRT:Squre root extraction is applied to the the input of AI function bloc, and the
result is output (in the range set in OUT_SCALE). This setting is not used
for Rotamass.
This output mode setting also applies to the scale and unit of indications on the LCD-indicator.
Set the time constant of damping in seconds. Thesetting of MASS_FLOW_VALUE_FTIME
affects not only the flow rate but also the totalization. In comparison, the setting of parameter
PV_TIME in an AI function block works as the damping time constant for the AI Blockґs OUT.
As the damping feature of the flowmeter itself, it is advisable to use
MASS_FLOW_VALUE_FTIME.
This setup is used for zeroing flow rate readings in a low flow rate area. The value of
MASS_FLOW_LOW_CUT (the cutoff level) is set in the same unit as that for
MASS_FLOW_VALUE_RANGE. In comparision, the setting of parameter LOW_CUT in
in an AI function block works as a low cutoff level setting the AI blockґs OUT. As the low
cutoff feature of the flowmeter itself, it is advisible to us MASS_FLOW_LOW_CUT.
Simulation of each AI/IT block can be performed in such a way that the value and status of
the input to the block can be set arbitrarily. Use this function for loop checks or the like.
Refer to Section 6.3, „Simulation Function“.
Set the units of data to be displayedon the LCD, and the display refresh cycle. Adjust
DISPLAY_PERIOD to improve legibility such as when used in a low temperature
enviroment causing hard-to-read indications.