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96VTR Datasheet(PDF) 9 Page - Extech Instruments Corporation. |
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96VTR Datasheet(HTML) 9 Page - Extech Instruments Corporation. |
9 / 15 page 9 96VTR Ver. 2.0 11/99 HiLt: High limit (of Span or Range). Set High Limit higher than the highest expected SV and PV display. Note that the high limit setting is limited by the range of the type of input used (refer to Section 2.2 for ranges). 9. PARAMETERS IN THE FOURTH PROGRAMMING LEVEL Press and hold the SCROLL and RETURN keys simultaneously for 5 seconds to enter this level from the previous programming level. To return to normal operation at any time, press the RETURN key. LoCA and HiCA: Low and High Input Calibration values used for engineering units scaling. Refer to Section 9.1 below for details. tunE: Auto-tuning ‘automatic initialization mode’ selection. Select the criteria by which the controller initiates an automatic Auto Tune session. Set this parameter as desired from the Table in Section 9.2. To activate Auto Tune manually, refer to Section 9.2. 9.1. CALIBRATION Important Note: Special equipment is required to perform calibrations. Do not initiate the calibration process unless fully prepared to do so. a. "LoCA" (Low Calibration) is the first parameter to appear in this level. b. For temperature inputs, connect a Thermocouple (mV) or RTD (resistance) simulator to the controller's input terminals. For a process DC input, use a 4-20mA or 1-5VDC signal, depending on the input type of the controller. c. Apply the low input signal to the controller which corresponds to the range you are using, i.e., for 4-20 mA inputs, 4 mA would now be applied to the controller. d. Use the UP/DOWN arrow keys to set the value which will display when a 4mA signal is applied to the controller. For example, for a 4-20mA unit to display from – 50 to +150, set ‘LoCA” to –50. e. Press and hold the RETURN key for at least 5 seconds and the parameter on the display will change from "LoCA" to "HiCA" (High Calibration). The Low Calibration value is now written into the controller's non-volatile memory. f. Apply the high input signal to the controller which corresponds to the range you are using. For example, for a 4-20mA input controller, apply a 20mA signal. g. Use the UP/DOWN arrow keys to set the value which will display when a 20mA signal is applied to the controller. For example, for a 4-20mA unit to display from – 50 to +150, set ‘LoCA” to +150. h. Press and hold the RETURN key for at least 5 seconds. The display will change from "LoCA" to "SP". The High Calibration value is now written into the controller's non-volatile memory. i. Input a signal midway between the Low and High Calibration signals previously applied (12mA in the example for a 4-20mA input) and verify that the display shows a value midway between the high display and the low display. For the example above, for a -50 to +150 display range, a 12mA input will display +50. If not, try the calibration procedure again. j. Press the RETURN key when complete to return to normal operation. 9.2 AUTO TUNING 9.2.1 Auto Tune Initialization Modes The Controller has the capability to start an Auto Tune session automatically. If this is desired, select the conditions whereby an Auto Tune session will automatically begin from Table III below. The controller defaults to Setting = ‘0’ (user initiates an Auto Tune session). To manually initiate an Auto Tune session follow the procedure in Section 9.2.2. |
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