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TP-6843 1/13 Section 2 Generator Set Operation 17
Section 2 Generator Set Operation
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 2-1 and Figure 2-2.
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.
Figure 2-1
Figure 2-1 Basic VSG Power Connections
Figure 2-2
Figure 2-2 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 on 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 2900 rpm. See
Section 3.14.1 for more information.
2.2 Prestart Checklist
To ensure continued satisfactory operation, perform
the following checks or inspections before or at each
startup, as designated, and at the intervals specified in
the service schedule. In addition, some checks
require verification after the unit starts.
Air Cleaner. Check for a clean and installed air
cleaner element to prevent unfiltered air from entering
the engine.
Air Inlets. Check for clean and unobstructed air inlets.
Battery. Check for tight battery connections. Consult
the battery manufacturer’s instructions regarding
battery care and maintenance.
Enclosure. Check that all enclosure panels and
internal baffling are in place.
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