Kohler 6VSG, Service Manual, Page: 48 / 108

48 Section 3 Controller TP-6844 1/13
3.8.2 Calibration Using SiteTech
Current calibration factors can be adjusted using
SiteTech™ software to calibrate the VSC controller.
Connect a personal computer (laptop) to the controller
using a USB cable and follow this procedure to use
Kohler
®
SiteTech™ software to calibrate the controller.
The current calibration factors are located in the
Genset Calibration group in SiteTech. Find the
parameters labeled Current Transformer Calibration At
No Load and Current Transformer Calibration At Full
Load. See Figure 3-20.
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 Voltage Regulator Average Voltage
Adjustment 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. Increasing the Current Transformer
Calibration At Full Load setting will permit
additional load to be placed on the generator
set.
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. Set the Current Transformer Calibration At Full
Load to the value displayed under the Generator
Current Average while the generator is at 100%
load.
5. Open the generator output breaker.
6. Set the Current Transformer Calibration At No
Load to the value displayed under the Generator
Current Average while the generator is at no load
(breaker tripped).
7. Close the circuit breaker for the generator output.
8. Verify that the load on the generator is displayed
correctly. Recalibrate if necessary.
9. Press OFF to stop the generator set.