STX Signal Transmitter Installation and Operation ... - Kistler-Morse

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Chapter 3. Stand-Alone STX Analog Calibration and Setup DSP Factor The DSP Factor determines the magnitude of change from the old to the new reference median, for change triggered by the Qualify Factor. In example 2 in Figure 3-4, the STX moves the reference median 80% of the distance from the old median to the last signal (which triggered the change), based on a DSP Factor of 80%. A value of 100% sets the new median to the last signal value; a value of 50% sets the new median halfway between the old median and the last signal value. Note that DSP Factor does not affect the change caused by a signal falling outside the Filter Step window, as shown in example 1 in Figure 3-4. Refer to Table 3-13 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 DSP Factor (%) 0 0 0 0 99 0 0 0 1 95 0 0 1 0 90 0 0 1 1 85 0 1 0 0 80* 0 1 0 1 75 0 1 1 0 70 0 1 1 1 65 1 0 0 0 60 1 0 0 1 55 1 0 1 0 50 1 0 1 1 45 1 1 0 0 35 1 1 0 1 25 1 1 1 0 10 1 1 1 1 5 1 = on, 0 = off, * = default Note: To select DSP Factor, set dipswitches DS5 through DS8: DS8 = 1, DS7 = 0, DS6 = 1, DS5 = 0. Table 3-13. DSP Filter DSP Factor Dipswitch Settings Filter Step The Filter Step is a window of equal counts above and below the reference median. As shown in Figure 3-4, example 1, if a large signal change is detected that falls outside of the window, the STX immediately moves the location of the reference median to that point. This allows the STX to adjust quickly to rapid material movement. Refer to Table 3-14 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 Filter Step 0 0 0 0 1 0 0 0 1 2 0 0 1 0 5 0 0 1 1 10 0 1 0 0 15 0 1 0 1 20 0 1 1 0 25 0 1 1 1 35 1 0 0 0 50 1 0 0 1 75 1 0 1 0 100 1 0 1 1 125 1 1 0 0 150* 1 1 0 1 175 1 1 1 0 200 1 1 1 1 255 1 = on, 0 = off, * = default Note: To select Filter Step, set dipswitches DS5 through DS8: DS8 = 1, DS7 = 0, DS6 = 1, DS5 = 1. Table 3-14. DSP Filter Filter Step Dipswitch Settings Qualify Factor The Qualify Factor is the triggering number of successive signals above or below the median signal value, but within the Filter Step window. In example 2 in Figure 3-4, the Qualify Factor is 3. When the third successive signal above the median value (but within the Filter Step window) is detected, the STX moves the location of the median value to that point or a percentage of the distance from the old median as determined by DSP Factor. This allows the STX to respond to definite trends in weight changes. Refer to Table 3-15 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 Qualify Factor 0 0 0 0 2 0 0 0 1 3* 0 0 1 0 4 0 0 1 1 5 0 1 0 0 6 0 1 0 1 7 0 1 1 0 8 0 1 1 1 9 1 0 0 0 10 1 0 0 1 11 1 0 1 0 12 1 0 1 1 13 1 1 0 0 20 1 1 0 1 30 1 1 1 0 60 1 1 1 1 120 1 = on, 0 = off, * = default Note: To select Qualify Factor, set dipswitches DS5 through DS8: DS8 = 1, DS7 = 1, DS6 = 0, DS5 = 0. Table 3-15. DSP Filter Qualify Factor Dipswitch Settings 3-10
Chapter 3. Stand-Alone STX Analog Calibration and Setup Material/Zero Tracking Tracking provides the ability to reject sensor drift and other related long-term errors while preserving the output’s stability and accuracy. Discrimination between material movement and sensor drift is accomplished by calculating the rate of change of the sensor input signal every ten seconds, and comparing this rate to a user-defined threshhold rate. The STX stops tracking when the rate of change exceeds the threshhold rate, indicating that material is actually moving. Additionally, discrimination between slow material loss (such as from a leak in the vessel) or gain and sensor drift is accomplished by comparing the total drift to a drift limit. The STX limits the maximum correction to this limit, so tracking does not mask real material loss/gain. There are two aspects to tracking — zero tracking and material tracking. See Figure 3-5: • Zero tracking establishes a userdefined window around the voltage associated with zero live load. When the raw voltage falls inside the window (usually indicating a negligible amount of material in the vessel) and the rate of change is below the threshhold rate, the corrected voltage and counts remain constant as those associated with zero live load (if serially communicating with an MVS, displayed weight remains zero). The correction is done by the algebraic addition of a correction offset value to the A/D converter output. If the raw voltage falls outside the window on the negative side, the STX resets the zero calibration point to that raw voltage, and sets the window around the new zero calibration point. • Material tracking establishes a reference when material movement within a vessel has become stable (rate of change is below the threshhold) during filling and batching processes. This reference is then used to maintain and hold steady the outputs. When the change in raw voltage falls within the drift limit (factory set at ± 5.00 mV), the corrected voltage and counts remain those associated with the reference weight. The correction is done by the algebraic addition of a correction offset to the A/D converter output. The maximum accumulated correction offset is limited to ± 5.0 mV. If the accumulated drift exceeds 5.0 mV, the STX begins tracking material movement, which may be caused by a slow leak in the vessel. Both zero and material tracking affect the STX’s current output as well as serial output to an MVS or other serial device. mV Accumulated drift within Material Tracking drift limit Accumulated drift within Material Tracking drift limit Corrected Output Raw Output Drift within Zero Tracking Window Zero Window live load voltage Window Time Rate of change within threshold — material not moving Rate of change exceeds threshold — material moving Rate of change within threshold — material not moving Figure 3-5. Material and Zero Tracking Example 3-11 Rate of change exceeds threshold — material moving Rate of change within threshold — material not moving
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Chapter 9. MVS-STX Math Channels
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Chapter 9. MVS-STX Math Channels 8.
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Appendix A. Product Specifications
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Appendix B. Serial Commands Appendi
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Appendix B. Serial Commands Checksu
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‘m7’ Command — Select Self-Ca
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Introduction Appendix C. MVS-STX Ca
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Appendix C. MVS-STX Calculation of
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Appendix D. MVS-STX Error Messages
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5. I/O Error Adr:XX Explanation An
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Appendix E. Trimming the Current Ou
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Appendix F. Industry Approvals Appe
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Appendix G. Kistler-Morse Service a
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Appendix H. Technical Drawings Appe
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Appendix H. Technical Drawings H-4
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Appendix I. MVS-STX Menu Tree and H
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