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PAGE 20 — DCA-600SSV — OPERATION AND PARTS MANUAL — REV. #0 (07/13/09)
DCA-600SSV — GENERAL INFORMATION
DCA-600SSVWhisperwatt™ Series Familiarization
Generator
The MQ Power Model DCA-600SSV is a 528 kW
generator
(Figure 5) that is designed as a high quality portable (requires
a trailer for transport) power source for telecom sites, lighting
facilities, power tools, submersible pumps and other
industrial and construction machinery.
Engine Operating Panel
The “Engine Operating Panel” is provided with the following:
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Tachometer/Hour Meter Gauge
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Water Temperature Gauge / Water Temp. Alarm Lamp
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Oil Pressure Gauge / Oil Pressure Alarm Lamp
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Charging Alarm Lamp
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Fuel Level Gauge / Low Fuel Warning Alarm Lamp
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Pre-Heat Button / Pre-Heat Lamp
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Air Filter Alarm Lamp
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Engine Speed Switch
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Battery Switch
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Emergency Stop Button
Generator Control Panel
The “Generator Control Panel” is provided with the following:
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Frequency Meter (Hz)
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AC Ammeter (Amps)
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AC Voltmeter (Volts)
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Ammeter Change-Over Switch
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Voltmeter Change-Over Switch
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Voltage Regulator
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Panel Light/Panel Light Switch
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3-Pole, 1,600 amp Main Circuit Breaker
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Engine Control Unit (Computer Controlled)
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“Control Box” (Located Behind Gen. Control Panel)
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Automatic Voltage Regulator
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Current Transformer
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Over-Current Relay
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Voltage Rectifer
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Starter Relay
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Voltage Change-over Board
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
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Three 120/240V output receptacles (CS-6369), 50A
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Three auxilliary circuit breakers, 50A
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Two 120V output receptacles (GFCI), 20A
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Two GFCI circuit breakers, 20A
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Four output terminal boards (3Ø power)
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Ground terminal
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Battery Charger (Optional)
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Water Heater (Optional)
Open Delta Excitation System
The DCA-600SSV generator is equipped with the state of
the art "
Open-Delta
" excitation system. The open delta
system consist of an electrically independent winding wound
among stationary windings of the AC output section.
There are four connections of the open delta A, B, C and D.
During steady state loads, the power from the voltage
regulator is supplied from the parallel connections of A to B,
A to D, and C to D. These three phases of the voltage input
to the voltage regulator are then rectified and are the
excitation current for the exciter section.
When a heavy load, such as a motor starting or a short
circuit occurs, the automatic voltage regulator (AVR)
switches the configuration of the open delta to the series
connection of B to C. This has the effect of adding the
voltages of each phase to provide higher excitation to the
exciter section and thus better voltage response during the
application of heavy loads.
The connections of the AVR to the AC output windings are
for sensing only. No power is required from these windings.
The open-delta design provides virtually unlimited excitation
current, offering maximum motor starting capabilities. The
excitation does not have a "
fixed ceiling
" and responds
according the demands of the required load.
Engine
The DCA-600SSV is powered by a 4 cycle, water cooled,
turbocharged
VOLVO Model PENTA TAD1642GE Diesel
Engine
. This engine is designed to meet every performance
requirement for the generator. Reference Table 2 for engine
specifications.
In keeping with MQ Power's policy of constantly improving
its products, the specifications quoted herein are subject to
change without prior notice.
Electronic Governor System
The electric governor system controls the RPMs of the en-
gine. When the engine demand increases or decreases, the
governor system regulates the frequency variation to ±.25%.
Extension Cables
When electric power is to be provided to various tools or
loads at some distance from the generator, extension cords
are normally used. Cables should be sized to allow for
distance in length and amperage so that the voltage drop
between the generator and point of use (load) is held to a
minimum. Use the cable selection chart (Table 6) as a guide
for selecting proper extension cable size.