46 Section 3 Controller TP-6844 1/13
3.8 Load (Current) Calibration
The VSC controller can be calibrated using the
controller keypad and menus, or using a personal
computer with Kohler
®
SiteTech™ software.
3.8.1 Calibration Using the VSC
Controller Keypad and Menus
The controller’s load calibration can be adjusted using
the controller keypad. See Figure 3-21 and follow the
procedure below.
Note: A digital ammeter is required for these
adjustments.
1. With the generator set off, connect a digital
multimeter to a DC current probe and configure it
to measure current supplied by the generator (DC
Amps).
Note: The 6VSG supplies current far in excess of what
a digital multimeter can handle using the
internal current measurement channel. A
clamp-on DC current probe or DC current meter
is required.
2. Start the generator set by pressing the RUN
button on the VSC controller.
3. Adjust the system voltage to obtain rated current
output if battery bank is attached. If no battery
bank is attached, a load bank will be necessary to
calibrate the generator load metering.
Note: If the generator current and voltage will not
increase when the setpoint is raised, it is
possible that the generator is in current-limit
mode. The maximum percent load may need to
be increased to reach rated output current on
the generator for calibration. The maximum
percent load may not be set above 105%. It is
possible that several calibration attempts may
be required to reach rated output current if the
controller has been replaced.
Note: If the current does not reach rated current when
the output voltage has reached a maximum safe
voltage, the battery bank may require
discharging before the calibration can be
completed. This may require the use of a load
bank.
Note: If the Percent Load of the generator is correct,
there is no need to complete calibration.
Percent Load is computed by the following:
% Load = (Measured Current * Output Voltage) / 60
4. Trip the output breaker on the generator.
5. Navigate to the Generator Metering menu and
press the Select button. Gen Voltage will be
displayed.
6. Press the Down button. The Generator Load will
be displayed.
7. Press and hold the Select button. No-Load
Calibration will be displayed.
8. Verify that the generator output breaker is open.
Press Select, select Yes, and press Select again.
9. Close the circuit breaker for the generator output.
10. Verify that the generator is supplying rated output
current. Press Select, select Yes, and press
Select again.
11. Verify that the load on the generator is displayed
correctly. Recalibrate if necessary.
12. Press OFF to stop the generator set.
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