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

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Chapter 3. Stand-Alone STX Analog Calibration and Setup Net/Gross Mode The analog current transmitter may be set to transmit current output based on either the net weight or gross weight. Refer to Table 3-7 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 Net/Gross Mode x x x 0 Gross* x x x 1 Net 1 = on, 0 = off, x = does not matter, * = default Note: To select Net/Gross Mode, set dipswitches DS5 through DS8: DS8 = 0, DS7 = 1, DS6 = 0, DS5 = 0. Table 3-7. Analog Current Output Net/Gross Mode Dipswitch Settings Polarity (Batch In/Out) The STX’s current transmitter may be set to increase current output with increasing signal input (most often used) or decrease current output with increasing signal input. Refer to Table 3-8 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 0/4-20 Polarity x x x 0 A/D Input Increasing (Batch In)* x x x 1 A/D Input Decreasing (Batch Out) 1 = on, 0 = off, x = does not matter, * = default Note: To select Polarity, set dipswitches DS5 through DS8: DS8 = 0, DS7 = 1, DS6 = 0, DS5 = 1. Table 3-8. Analog Current Output Polarity Dipswitch Setting Note If you set Polarity to Decreasing and later need to recalibrate the STX, temporarily set Polarity to Increasing before you recalibrate. After recalibration is complete, reset Polarity to Decreasing. Analog/Digital Mode The STX can be set up to operate in the analog or the digital operating mode: • Analog Mode — current output transmitted by STX PCB is based on analog calibration, detailed in the Analog Calibration section in this chapter. • Digital Mode — current output transmitted by STX PCB is based on digital calibration (performed using MVS menu tree or serial commands, as applicable). Note If an MVS or other serial device is communicating with the STX, other outputs (for example, setpoints, current outputs from the MVS’s Current Output PCB, and serial communications) are based on the digital calibration, regardless of which mode is selected. Refer to Table 3-9 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 Mode x x x 0 Analog* x x x 1 Digital 1 = on, 0 = off, x = does not matter, * = default Note: To select Analog/Digital Mode, set dipswitches DS5 through DS8: DS8 = 0, DS7 = 1, DS6 = 1, DS5 = 0. Table 3-9. Analog/Digital Mode Dipswitch Settings Serial Port Baud Rate The serial port baud rate determines the speed with which the STX communicates with the MVS, PLC, etc. Refer to Table 3-10 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 Baud Rate x 0 0 0 1200 x 0 0 1 2400 x 0 1 0 4800 x 0 1 1 9600* x 1 0 0 19200 1 = on, 0 = off, x = does not matter, * = default Note: To select Baud Rate, set dipswitches DS5 through DS8: DS8 = 0, DS7 = 1, DS6 = 1, DS5 = 1. Table 3-10. Serial Port Baud Rate Dipswitch Settings Excitation Voltage This parameter adjusts the STX’s excitation voltage output, which is used to excite the sensors. The default is 12 Volts, appropriate for K-M silicon sensors without Intrinsically Safe (IS) Barriers. Foil gage sensors typically require 10 Volts of excitation; refer to the manufacturer’s data sheet for recommended excitation. Note If using IS Barriers, it may be necessary to lower the excitation voltage. 3-8
Chapter 3. Stand-Alone STX Analog Calibration and Setup Refer to Table 3-11 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. Note that the excitation voltages shown in the table are under nominal line conditions. DS4 DS3 DS2 DS1 Excitation Volts 0 0 0 0 12.5 0 0 0 1 12* 0 0 1 0 11.5 0 0 1 1 11 0 1 0 0 10.5 0 1 0 1 10 0 1 1 0 9.5 0 1 1 1 9 1 0 0 0 8.5 1 0 0 1 8 1 0 1 0 7.5 1 0 1 1 7 1 1 0 0 6.5 1 1 0 1 6 1 1 1 0 5.5 1 1 1 1 5 1 = on, 0 = off, * = default Note: To select Excitation Voltage, set dipswitches DS5 through DS8: DS8 = 1, DS7 = 0, DS6 = 0, DS5 = 0. Table 3-11. Excitation Voltage Dipswitch Settings DSP Filter Vibrations in a vessel can cause changes in the STX’s output, even though no material is moved, because the vibrations affect the vessel’s structural response. The Sentry DSP Filter reduces output changes that can result from vibration. The principle behind the filtering follows. The A/D converter digitizes the signal coming from a sensor. The STX picks the first signal as a reference median; this value is used in calculating the output. As shown in Figure 3-4, the STX then compares following signals to the reference median, and recalculates the reference median when either of the following happen: • the number of successive signals above or below the median exceeds a triggering number • a signal falls outside a user-defined window around the reference median When the STX recalculates the reference median, the transmitted data changes to correspond to the new reference median. The DSP Filter affects the STX’s current output as well as serial output to an MVS or other serial device. The DSP Filter has four parameters to define its operation: Filter On/Off, DSP Factor, Filter Step, and Qualify Factor. Filter On/Off This turns the DSP filter on and off. Refer to Table 3-12 for the positions of DS1 through DS8 and then follow the procedure in Setting Up the Parameter. DS4 DS3 DS2 DS1 Filter On/Off x x x 0 On x x x 1 Off* 1 = on, 0 = off, x = does not matter, * = default Note: To select Filter On/Off, set dipswitches DS5 through DS8: DS8 = 1, DS7 = 0, DS6 = 0, DS5 = 1. Table 3-12. DSP Filter On/Off Dipswitch Settings Counts Signal falls outside of Filter Step envelope Counts 3rd successive signal on same side of median Reference Median Filter Step Filter Step New median = last signal New median = ref median + 0.8 x (ref median - last signal) Raw Counts Corrected Counts Example 1 — Qualify Factor =3, DSP Factor =80% (0.80) Time Figure 3-4. DSP Filter Examples 3-9 Example 2 — Qualify Factor =3, DSP Factor =80% (0.80) Time
Page 1 and 2: STX Signal Transmitter Installation
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Page 59 and 60: Introduction 7-1 Chapter 7. MVS-STX
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Chapter 8. MVS-STX Service Menu •
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Chapter 8. MVS-STX Service Menu Mic
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Chapter 8. MVS-STX Service Menu The
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Chapter 9. MVS-STX Math Channels Ch
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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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