Yokogawa ADMAG AXR Manual de usuario descargar pdf (Pagina 82)

<6. PARAMETER DESCRIPTION>

6-34

IM 01E30D01-01EN

[J22: Dead Time] Setting of dead time

This parameter sets the time for application of the

rate limit, and if a value of 0 is set, the rate limit

function will be terminated.

NOTE

Determining rate limit value and dead time

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Rate limit value:

Determines the level for

output fluctuation cutoff. For

example, if this is set to 2%,

noise above 2% will be

eliminated as shown in the

diagram.

Dead time (T

0):

This is to be determined using

the output fluctuation width. If

noise exceeds the dead time

as shown in the diagram

below, the dead time should

be made longer.

● Signal processing method:

Axedupperandlowerlimitvalueissetupwith

respect to the primary delay response value for

theowratevalueobtainedduringtheprevious

sampling,andifthecurrentlysampledowrate

is outside these limits, then the corresponding

limitisadoptedasthecurrentowratevalue.

In addition, if signals which breach the limits in

the same direction occur over multiple samples

(i.e., within the dead time), it is concluded that

thecorrespondingsignalisaowratesignal.

Example 1: Step input

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10%

Step signal

Flow rate value

after rate limit

processing

63.2

100 225

Dead time: 3 s

Input: 0 to 10%

Damping time constant: 5 s

Dead time: 3 s

Rate limit value: 1%

Number of signal samples

Flow rate value after

damping

(a)

(b)

(c)

(d)

(1) In comparison with the previous value at (a), it

is determined that the signal is in excess of the

rate limit value and the response becomes 1%.

However, the actual output applies damping,

and therefore the output turns out to be as

indicated by the solid line.

(2)Subsequentowvalueswithinthedeadtime

zone correspond to signals of post-damping

owvalue+ratelimitvalue(1%).

(3) Since input signals do not return to within

the rate limit value during the dead time, it is

eterminedat(c)thatthissignalisaowrate

signal.

(4) The output signal becomes a damped curve

and compliance with the step signal begins.

 Fivesecondsafterdeterminationofaowrate

signalintheabovegure,alevelof63.2%is

reached.

Example 2: Slurry noise

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+1%

-1%

Dead time: 1 s

Flow rate value after damping

Flow rate value

after rate limit

processing

Slurry noise

Input: 0 to 10%

Damping time constant: 1 s

Dead time: 1 s

Rate limit value: 1%

Time

In the figure on the left, it

is determined that the

slurries noise signal is not

a flow rate signal.

[J23: Pulsing Flow]Selectionofpulsingow

support

Inasituationwherepulsatingowcauseserrorin

theaverageowvalue,duetotheapplicationofa

plunger pump, this parameter provides functionality

whereby calculation is controlled and variations in

owratearefollowed.

Setting Function

No Normal

Yes Support for p

ulsingow

[J25:T/PDampSelect] Setting of damping

operation

Thisparameterisusedtoselectthattheowrate

value obtained through damping calculation for

totalization and pulse output or the instantaneous

owratevalue(nodamping)fortotalizationand

pulse output.

Setting Function

Damp Damping

No Damp No damping

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 193 194

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