TP-6844 1/13 Section 5 Component Testing and Adjustment 65
Section 5 Component Testing and Adjustment
5.1 Theory of Operation
The generator set uses 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 5-1 and Figure 5-2.
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 5-1
Figure 5-1 Basic VSG Power Connections
Figure 5-2
Figure 5-2 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 3.3.1
for more information.
5.2 Electrical Output
Troubleshooting
5.2.1 No to Low Voltage Operation
This section covers the operation of the electrical
output and troubleshooting information for low or no
voltage output. Before beginning the test procedures,
read all safety precautions at the beginning of this
manual. Many of the test procedures include
additional safety precautions.
If the output voltage is below 85% of the rated voltage
at no load, check the following with the engine running
(press RUN to start the generator set):
• The output breaker is closed (check voltage at the
rectifier).
• The Voltage Regulator Average Voltage Adjustment
parameter is correct.
• Engine Speed (should be within 300 rpm of the idle
speed) – if the engine speed is low, check the
voltage and % load reading on the VSC controller.
High current means a short circuit; rated voltage
indicates that the VSC controller sees the correct
voltage.
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