Generator Set Operation; Theory Of Operation - Kohler 6VSG Operation Manual

2.1

Theory of Operation

The generator set utilizes a permanent-magnet alternator to produce 3-phase AC voltage. This voltage is rectified using a full-
wave 3-phase rectifier (single block rectifier for 36V and 48V, three individual rectifier blocks for 24V) to produce low -ripple DC
output. See Figure 8 and Figure 9.
Figure 8 Basic VSG Power Connections
Figure 9 Output Waveform, with Rectified Signal
The voltage is regulated to maintain a constant output voltage, which is equal to the System Voltage setting. When the load o n
the 6VSG generator increases, the generator controller increases the engine speed. The 6VSG series is designed to produce
rated voltage at 2300 rpm with no load and at 2900 rpm when supplying full load. The output current and power increase with
the engine speed. The engine speed is limited to a maximum of 3300 rpm. See the System Parameters for Battery Bank Charging
section for more information.
The VSC measures the average DC voltage on the output and lists this on the auto-scrolling display, in the Overview menu and
in the Generator metering menu.
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Section 2. Generator Set Operation
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