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PAXUSB00 Datasheet(PDF) 11 Page - Red Lion Controls. Inc |
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PAXUSB00 Datasheet(HTML) 11 Page - Red Lion Controls. Inc |
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11 / 32 page  11 1-InA Display Decimal Point dECPt Input Range rANgE Display Rounding round Scaling Style StYLE FILtr Filter Setting bANd Filter Band Scaling Points PtS Display x Value dSP Input x Value INP xx PAR Pro rAtE Conversion Rate 11 6.1 mOdUle 1 - signal inPUT ParameTers ADC CONVERSION RATE Select the ADC conversion rate (conversions per second). The selection does not affect the display update rate, however it does affect setpoint and analog output response time. The default factory setting of 19.8 is recommended for most applications. Selecting a fast update rate may cause the display to appear very unstable. 1-Inb Display Decimal Point dECPt Input Range rANgE Display Rounding round Scaling Style StYLE FILtr Filter Setting bANd Filter Band Scaling Points PtS Display x Value dSP Input x Value INP xx PAR Pro rAtE Conversion Rate INPUT A PARAMETER MENU INPUT B PARAMETER MENU INPUT RANGE Select the input range that corresponds to the external signal. Before applying signal configure input jumper to match setting desired. 20.000 mA 10.000 V RANGE RESOLUTION SELECTION DISPLAY DECIMAL POINT Select the decimal point location for the Input display. (The TOT display decimal point is a separate parameter.) This selection also affects , and parameters and setpoint values. DISPLAY ROUNDING* Rounding selections other than one, cause the Input Display to ‘round’ to the nearest rounding increment selected (ie. rounding of ‘5’ causes 121 to round to 120 and 124 to round to 125). Rounding starts at the least significant digit of the Input Display. Remaining parameter entries (scaling point values, setpoint values, etc.) are not automatically adjusted to this display rounding selection. FILTER SETTING The input filter setting is a time constant expressed in tenths of a second. The filter settles to 99% of the final display value within approximately 3 time constants. This is an Adaptive Digital Filter which is designed to steady the Input Display reading. A value of ‘0’ disables filtering. to seconds FILTER BAND* The digital filter will adapt to variations in the input signal. When the variation exceeds the input filter band value, the digital filter disengages. When the variation becomes less than the band value, the filter engages again. This allows for a stable readout, but permits the display to settle rapidly after a large process change. The value of the band is in display units, independent of the Display Decimal Point position. A band setting of ‘0’ keeps the digital filter permanently engaged. to display units SCALING POINTS Linear - Scaling Points (2) For linear processes, only 2 scaling points are necessary. It is recommended that the 2 scaling points be at opposite ends of the input signal being applied. The points do not have to be the signal limits. Display scaling will be linear between and continue past the entered points up to the limits of the Input Signal Jumper position. Each scaling point has a coordinate-pair of Input Value () and an associated desired Display Value (). Square Root Extraction Input Range - Scaling Points (2) The PAXDP can apply the square root function directly to the sensor signal by selecting the Square Root Extraction Input Range ( or ). When configured for Square Root Extraction, piecewise multipoint linearization is not required and only the first 2 scaling points are used. For proper operation the Display 1 ( ) value must be zero. Nonlinear - Scaling Points (Greater than 2) For non-linear processes, up to 16 scaling points may be used to provide a piece-wise linear approximation. (The greater the number of scaling points used, the greater the conformity accuracy.) The Input Display will be linear between scaling points that are sequential in program order. Each scaling point has a coordinate-pair of Input Value () and an associated desired Display Value (). Data from tables or equations, or empirical data could be used to derive the required number of segments and data values for the coordinate pairs. In the Crimson 2 (SFCRM2) software, several linearization equations are available. See the Accessories section for more information. to * The decimal point position is dependent on the selection made in the “Display Decimal Point” parameter. SCALING STYLE If Input Values and corresponding Display Values are known, the Key-in () scaling style can be used. This allows scaling without the presence or changing of the input signal. If Input Values have to be derived from the actual input signal source or simulator, the Apply () scaling style must be used. apply signal key-in data ±20.000 mA - Square Root Extraction ±10.000 V - Square Root Extraction |
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