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2.7.4 Generator Metering (and Calibration)
Displays generator output data including line-to-line and line-to-neutral voltages, current, frequency, total kilowatts, and total
kVA. The menu displays three-phase voltage and current readings when applicable.
All menu displays apply to both single-phase or three- phase voltages on the menu overview. The phase designation does not
appear in the controller menu displays. Some displays will show 0 values when single-phase connections are shown.
Note:
For Decision-Maker
®
3000 controllers with firmware versions before 3.0.25, see the section titled: GenSet Calibration, for
generator calibration.
Display also provides access to the calibration factors for metering (volts and amps). Changing the system voltage or replacing
the main logic control circuit board requires calibration adjustment. Connect a meter with a minimum accuracy of 1% to the
generator set output leads to calibrate the voltage-sensing logic.
To enable calibration, start the generator set and select the Volts L1-L2 display. Then push and hold the pushbutton/rotary
selector dial until the Calibration Enabled popup appears. Calibration of each display is now available. The display will show the
following values for three-phase generator sets. Single-phase generator sets will only display items marked (*).
• Volts L1-L2 *
• Volts L2-L3
• Volts L3-L1
• Volts L1-N *
• Volts L2-N *
• Volts L3-N
• Current L1 *
• Current L2 *
• Current L3
The user can change individual values or can select Reset Calib?- Yes to reset all voltage and current values. The Reset Calib?
display will only show if calibration is enabled.
When calibrating voltage, the metered value and the number being entered as the calibrated value must be within 10% of the
system operating voltage.
When calibrating current, the metered value must be at least 25% of the rated current on units smaller than 100 kW and at least
50 amps on units rated larger than 100 kW. The number being entered as the calibrated value must within 10% of the metered
value.
To disable calibration, Rotate the pushbutton/rotary selector dial until the <- Return popup appears.
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