DynaGen GSC400 Series Calibration Utility Manual - Page 5
Browse online or download pdf Calibration Utility Manual for Controller DynaGen GSC400 Series. DynaGen GSC400 Series 18 pages. For generator
Also for DynaGen GSC400 Series: Programmer's Manual (4 pages)
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2. GSC400 Calibration Process
During manufacture the GSC400 AC sensing is calibrated. The GSC400
contains slope and offset constants for each of the phases (A, B, and C) for
voltage and current (12 constants in total). These constants can vary from -126
to 126.
Factory Calibration Steps
1. Measure voltage/current at two points. Use values to determine the
actual slope. Plug this into an equation to determine the voltage and
current slope constants for each phase. Update the controller with these
constants.
2. The calibration at the factory repeats this process and adds the two slope
constants to obtain the final slope constant to ensure the slope is as
accurate as possible. Once this is performed there only a pure offset
error remains. In practice there is always a small slope component
present.
3. Measure two current/voltage points and take weighted average.
Determine the offset error. Plug this into an equation to determine the
voltage and current offset constants for each phase. Update the
controller with these constants.
4. Verify the AC voltage and current meet the accuracy tolerance
specifications.
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.
For AC voltage this is not possible since the voltage cannot be varied. For
voltage only an offset calibration can be performed and there will still be a slope
error component after the calibration. This means as the actual voltage varies
from the calibrated voltage point the accuracy of the GSC400 will decrease.
The sections below will outline the equations used in the calibration of the
GSC400.
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