Red Lion PAX2D - Manual (Page 13)

13
Non-linear Application – Up to 10 Scaling Points
For non-linear processes, up to 10 scaling points may be used to provide a
piece-wise linear approximation representing the non-linear function. The Rate
Display will be linear between sequential scaling points. Thus, the greater the
number of scaling points, the greater the conformity accuracy. The Crimson
software provides several linearization equations for common Rate applications.
RATE INPUT SCALING STYLE
KEY APPLY
Rate Input values for scaling points can be entered by using the Key-in or the
Applied style described below.
Key-in:
Enter the Rate Input value by pressing the ! or @ keys. This value is always
in pulses per second (Hz).
Applied:
The existing programmed Rate Input value will appear. To retain this value,
press the P key to continue to the next parameter. To enter a new value, apply
an external rate signal to the appropriate input terminal. Press the @ key and the
applied input frequency (in Hz) will be displayed. To insure the correct reading,
wait until a consistent reading is displayed, then press the P key to accept this
value as the Rate Input Value and continue to the next parameter. Follow the
same procedure if using more than 2 scaling points.
RATE DISPLAY VALUE SCALING POINT 1
0 to 999999
For all zero-based applications (display value 0 for 0 Hz input), the Display
Value and Input Value for Scaling Point 1 should be set to 0 and 0.0 respectively.
For non-zero based applications, enter the desired Display Value for a 0 Hz input.
RATE INPUT VALUE SCALING POINT 1
0.0 to 99999.9
Normally the Rate Input Value for Scaling Point 1 is 0.0.
RATE DISPLAY VALUE SCALING POINT 2
0 to 999999
Enter the desired Rate Display Value for Scaling Point 2.
RATE INPUT VALUE SCALING POINT 2
0.0 to 99999.9
Enter the corresponding Rate Input Value for Scaling Point 2, by using the
Input Scaling Style selected.
RATE DISPLAY ROUNDING
1 5 20 100
2 10 50
Rounding values other than ‘1’ round the Rate display to the nearest
increment selected (e.g. rounding of ‘5’ causes 122 to round to 120 and 123 to
round to 125). Rounding starts at the least significant digit of the Rate display.
RATE LOW CUT-OUT
0 to 999999
The Low Cut Out value forces the Rate display to zero when the Rate display
falls below the value entered.
RATE SCALING
To scale the Rate, enter a Scaling Display value with a corresponding Scaling
Input value. (The Display and Input values can be entered by Key-in or Applied
Methods.) These values are internally plotted to a Display value of 0 and Input
value of 0 Hz. A linear relationship is formed between these points to yield a rate
display value that corresponds to the incoming input signal rate.
KEY-IN SCALING METHOD CALCULATION
If a display value versus input signal (in pulses per second) is known, then
those values can be entered into Scaling Display (Rx dSP) and Scaling Input
(Rx INP). No further calculations are needed.
If only the number of pulses per ‘single’ unit (i.e. # of pulses per foot) is
known, then it can be entered as the Scaling Input value and the Scaling Display
value will be entered as the following:
RATE PER DISPLAY ( R x dSP ) INPUT ( R x INP )
Second 1 # of pulses per unit
Minute 60 # of pulses per unit
Hour 3600 # of pulses per unit
NOTES:
1. If # of pulse per unit is less than 10, then multiply both Input and Display
values by 10.
2. If # of pulse per unit is less than 1, then multiply both Input and Display
values by 100.
3. If the Display value is raised or lowered, then Input value must be raised
or lowered by the same proportion (i.e. Display value for per hour is
entered by a third less (1200) then Input value is a third less of # of pulses
per unit). The same is true if the Input value is raised or lowered, then
Display value must be raised or lowered by the same proportion.
EXAMPLE:
1. With 15.1 pulses per foot, indicate feet per minute in tenths. Scaling
Display = 60.0 Scaling Input = 15.1.
2. With 0.25 pulses per gallon, indicate whole gallons per hour. (To have
greater accuracy, multiply both Input and Display values by 10.) Scaling
Display = 36000 Scaling Input = 2.5.
RATE C PARAMETERS
RATE C CALCULATION
Select the calculation for the Rate C display.
SELECTION MODE DESCRIPTION
NONE None Rate C disabled.
Add Ab SUM (A+B) Rate C shows the sum of Rate A
and Rate B.
Sub Ab DIFFERENCE (A-B) Rate C shows the difference of Rate
A and Rate B.
Pct Ab RATIO (A/B) Rate C shows the percentage of
Rate A to Rate B.
Pct At PERCENT OF TOTAL
(A/A+B)
Rate C shows the percentage of
Rate A to the total of Rate A and
Rate B.
Pct dr PERCENT DRAW
(A-B/B)
Rate C shows the percent draw
between Rate A and Rate B.
StYLE
KEY
Rt x
R
X
dSP
O
1
R
X
INP
0.O
1
R
X
dSP
100O
2
R
X
INP
1000.O
2
ROUNd
1
Rt x
LO-CUt
O
Rt x
SELECt
RAtE C
Rt
RAtE C
NONE
RtC