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DynaGen GSC400 Calibration Utility Manual

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GSC400
Calibration Utility Manual
Revision 1.0
Full Version File
: MAN-0086R1.0, GSC400 Calibration Utility Manual.doc,
September, 2010

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  • Page 1 GSC400 Calibration Utility Manual Revision 1.0 Full Version File : MAN-0086R1.0, GSC400 Calibration Utility Manual.doc, September, 2010...

  • Page 2: Table Of Contents

    2 of 18 This Document This document will explain the GSC400 AC calibration process and how to use the GSC400 Calibration Utility to perform calibrations in the field. Table of Contents Calibration Theory....................3 GSC400 Calibration Process ................5 Definitions......................6 AC Current Slope Calculation ................

  • Page 3: Calibration Theory

    3 of 18 1. Calibration Theory In an ideal world the output from the AC sensing circuit would be proportional to the AC current and voltage at its input for all voltage and current levels (within a certain random accuracy). In practice, the un-calibrated accuracy can vary as a function of the voltage or current level (this is called a slope error) and/or be offset by a fixed amount (offset error).
  • Page 4 4 of 18 Pre- calibrate Pivot Point d curve Ideal Curve Measured Voltage/Current Figure 3 – Offset and slope errors.

  • Page 5: Gsc400 Calibration Process

    Calibration Points AC Voltage: 110VAC, 220VAC AC Current: 0.8A, 4A Note: This is current into GSC400, 0 to 5A. This gets multiplied by CT ratio for display on controller) Field Calibration In the field for AC current it is possible to apply the above procedure as the current can be varied.

  • Page 6: Definitions

    6 of 18 2.1 Definitions ACC_MH – AC Current Measured High ACC_ML – AC Current Measured Low ACV_MH – AC Voltage Measured High ACV_ML – AC Voltage Measured Low ACC_RH – AC Current Reference High ACC_RL – AC Current Reference Low ACV_RH –...

  • Page 7: Ac Current Offset Calculation

    7 of 18 2.4 AC Current Offset Calculation offset = -((ACC_ML – ACC_RL) * LOW_CUR_WEIGHTED_AVG + (ACC_MH – ACC_RH)) / (LOW_CUR_WEIGHTED_AVG + 1) If offset < -0.252 Then ACC_O = -126 Else If offset > 0.252 Then ACC_O = 126 Else ACC_O = offset / 0.002 End If...

  • Page 8: Gsc400 Ac Calibration Utility

    3. GSC400 AC Calibration Utility 3.1 Main Screen When you open the GSC400 AC Calibration Utility the window in Figure 4 will appear. This window allows you to read or modify the 12 AC Sensing calibration constants on the GSC400. Each value can range from -126 to 126.

  • Page 9: Manual Calibration

    9 of 18 3.2 Manual Calibration AC Voltage Calibration If the voltage only varies a little from the system voltage a simple offset adjustment is sufficient. When the voltage offset calibration constant is decremented by 1 the actual voltage reading is decremented by 0.1VAC. The calibration constants range from -126 to 126.

  • Page 10: Calibration Wizard

    AC voltage. Do not use if AC voltage tolerance is adequate. The old calibration constants stored in the GSC400 are used as a starting point. If voltage and/or current sensing are significantly off you should perform a manual AC voltage calibration and then use the wizard to calibrate the AC current (set all AC current calibration constants to 0 and select the “Current Only”...

  • Page 11: Equipment

    2. A load source to generate two different currents for the calibration preferably at 25% and 75% of normal maximum load. 3. Knowledge of the number of phases the GSC400 is measuring (A, B, C). To determine this look at the AC Voltage connections on the back of the GSC400.

  • Page 12: Wizard Walk Through

    (it is Figure 7 important that you enter zero for the phases not sensed by the GSC400 or the wizard will attempt calibration for that phase). Click Next. 2. You will be asked to place the controller in the OFF mode.
  • Page 13 13 of 18 3. If the GSC400 is not already in the RUN mode place the GSC400 in the RUN mode and wait until AC voltage reading stabilized. Click OK. The utility will then read the generator voltage. Figure 9 4.
  • Page 14 14 of 18 6. The utility will get the GSC400 measured current. Click Next. Figure 12 7. Out of the two AC currents (loads) you picked for calibration place the larger load on the generator and measure the actual current.
  • Page 15 (loads) you picked for calibration place the smaller load on the generator and measure the actual current. Record the current in the utility. Click Next. Figure 16 11. The utility will get the GSC400 measured current. Click Next. Figure 17...
  • Page 16 Record the current in the utility. Click Next. Figure 18 13. The utility will get the GSC400 measured current. Click Next. Figure 19 14. The utility will calculate the offset calibration constants and save them to the GSC400.
  • Page 17 17 of 18 15. Calibration is finished. You can select and copy the text in the box if you want a copy of the calibration information. Click Finish. Figure 21 Below is an example of the calibration status box text. Calibration is finished.
  • Page 18 18 of 18 Current - Phase B Delta Slope Calibration: 0 Current - Phase A Slope Calibration: -126 Current - Phase A Delta Slope Calibration: -3960 -------------------------------- Click Next to continue. Current for phase A, B, and C are: 0.1A, 0A, and 0A. Reading current ...

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