MODULE #1 - SCALE BY SIGNAL LEVEL METHOD
Select one of the two input ranges and one of the two excitation ranges by
placing a jumper in the correct position at the rear of the unit before
proceeding with Pro 1.
(Refer to the section on “Selecting the Input Range
and Excitation”.)
PROGRAM DECIMAL POINT POSITION
Select the desired decimal point position of the scaled display by pressing
either the
“Up”
or
“Down”
button.
Note: Whatever decimal point is selected will appear in succeeding
programming steps. Also, the “P” button must be pressed after each step to
enter the desired data and to proceed to the next step.
“dECPNt” < > “0”
“0.0”
“0.00”
“0.000”
“0.0000”
PROGRAM ROUNDING INCREMENT AND RIGHT HAND
DUMMY ZEROS
Rounding values other than one cause the scaled number to
‘round’
to the
nearest rounding increment selected
(ie. rounding of ‘5’ causes ‘122’ to round
to ‘120’ and ‘123’ to round to ‘125’)
. If the process is inherently jittery, the
display value may be rounded to a higher value than 1. If the range of the
process exceeds the required resolution,
(ex. 0-10,000 PSI, but only 10 PSI
resolution required)
, a rounding increment of 10 will effectively make the
display more stable. This programming step is usually used in conjunction with
programmable digital filtering
(Pro 4)
to help stabilize display readings.
(If
display stability appears to be a problem and the sacrifice in display resolution
is unacceptable, program higher levels of digital filtering or increase the level
of process dampening.)
Rounding increments of 10, 20, 50, and 100 may also
be used to add
“dummy zeros”
to the scaled readings, as desired.
“round” < > “1”
“2”
“5”
“10”
“20”
“50”
“100”
At this stage a choice of either return to
“Pro 0”
or continue with scaling of
the display is offered.
“SCALE” < > “yES”
“NO”
If
“YES”
was selected for the previous step, the scaling procedure is
started. In order to scale the indicator, two signal level 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 of a signal-display
pair is listed below:
3.000 PSI @ 0 mV AND 15.000 PSI @ 20 mV
Scaling point #1
Scaling point #2
Note that 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. With this scaling
procedure, the display values are keyed in and signal values are applied to the
indicator by either a signal simulator or the actual signal source.
KEY-IN DISPLAY VALUE FOR SCALING POINT #1
“dSP 1” < > “-99999” to “99999”
(ex. 3.000 PSI)
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