Yokogawa RotaMASS 3-Series Manual de usuario descargar pdf (Pagina 127)

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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.

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Yokogawa RotaMASS 3-Series Manual de usuario Pagina 127

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