Red-lion PCU Manuel d'utilisateur télécharger pdf (Page 30)

Input Signal Filter and Display Update Rate (FLtr)

Selecttherelative degree ofinput signal filteringanddisplay update rate.

The filter is an adaptive digital filter that discriminates between

measurement noise and actual process changes. Therefore, the influence on

step response time is minimal. If the signal is varying too greatly due to

measurement noise, increase the filter value. Additionally, with large

derivative times, control action may be too unstable for accurate control.

Increase the filter value. Conversely, if the fastest controller response is

desired, decrease the filter value.

The Auto-tune procedure sets the filter value appropriate to the process

characteristics. Also see Output Power Dampening parameter (OPdP), page

25, for filtering the output.

Fltr-0to4

0 = least input filtering

3 = most input filtering

4 = most input filtering and slower (2/sec) display update rate

(outputs update at 10/sec rate)

Scaling Points

Prior to installing and operating the controller, it may be necessary to

change the scaling to suit the display units particular to the application.

Although the unit has been programmed at the factory, the scaling will

generally have to be changed.

The controller is unique in that two different scaling methods are available.

The operator may choose the method that yields the easier or more accurate

calibration. The two scaling procedures

are similar in that theoperator keys in the

display values and either keys in or

applies a signal value that corresponds to

those scaling points. The location of the

scaling points should be near the process

endlimits,forthebestpossibleaccuracy.

Once these values are programmed

(coordinates on a graph), the indicator

calculates the slope and intercept of the

signal/display graph automatically. No

span/zero interaction occurs, making

scaling a one-pass exercise.

Before programming the indicator, it is advised to organize all the data for

the programming steps to avoid possible confusion.

To scale the indicator, two signal values and two display values that

correspond to the signal values must be known. These four values are used to

complete the scaling operation. An example is listed below:

Scaling Point #1 Scaling Point #2

0.0% @ 4.00 mA & 100.0% @ 20.00 mA

Reverse acting indication can be accomplished by either reversing the two

signal points or the display value points, but not both. If both are reversed,

then forward (normal) acting indication will occur. In either case, do not

reverse the input wires to correct the action.

Display Values (dSP1 & dSP2)

Key-in the display value for scaling point one and scaling point two.

dSP1 -999 to 9999 (Ex. 0.0%)

dSP2 -999 to 9999 (Ex. 100.0%)

Signal Input Values (INP1 & INP2)

The signal input value can either be keyed in via the front panel buttons or

aninput signal can be applied to the appropriate signal input terminals. When

entering the signal input parameter, the unit is in the key-in mode.

Key-in Method

Key-in the signal value for scaling point one and scaling point two.

INP1 -999 to 9999 (Ex. 0.00 VDC or 4.00 mA DC)

INP2 -999 to 9999 (Ex. 10.00 VDC or 20.00 mA DC)

Signal Input Method

To change to the apply signal method press the DSP button. Front panel

annunciators % PW and DEV will flash, and the display indicates the signal

value applied to the input terminals. The unit can be toggled to the key-in

method by pressing the DSP button again.

Signal Range Display Range

4.00 to 20.0 mA DC 0.00 to 20.00

0.00 to 10.00 VDC 0.00 to 10.00

Whenthe desiredvalue is indicated on the display, press the PARbutton to

store the value and advance to the next parameter.

-22-

Figure 12, Scaling Points

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 95 96

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Red-lion PCU Manuel d'utilisateur Page 30

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