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PAGE 18 — DCA-15SPX4— OPERATION MANUAL — REV. #0 (02/17/09)
DCA-15SPX4 — GENERAL INFORMATION
DCA-15SPX4 Whisperwatt™ Series Familiarization
Generator
The MQ Power Model DCA-15SPX4 is a 15 kW
generator
(Figure 3) 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.
Generator Control Panel
The “Engine Operating Panel” is provided with the following:
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Warning Lamp Unit
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Preheat Lamp
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Oil Pressure Alarm Lamp
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Water Temperature Alarm Lamp
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Battery Charging Alarm Lamp
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Speed Control Switch
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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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Voltage Regulator
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Starter Switch
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Hour Meter
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3-Pole, 70 amp Main Circuit Breaker
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1-Pole, 20 amp Circuit Breaker (for GFCI)
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1-Pole, 30 amp Circuit Breaker (for L5-30R)
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2-Pole, 30 amp Circuit Breaker (for L6-30R)
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2-Pole, 50 amp Circuit Breaker (for CS6369)
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“Control Box” (located behind the 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
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
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Three output terminal lugs (1Ø power)
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1-Phase Output Terminal
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120/240V output receptacle (CS-6369), 50A
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120 output receptacle (5-20R)GFCI, 20A
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120V output receptacle (L5-30R), 30A
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240V output receptacle,(L6- 30R) 30A
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Ground Terminal (for G.F.C.U)
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Battery Charger (Optional)
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Water Heater (Optional)
Open Delta Excitation System
The 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-15SPX4 is powered by a 4 cylinder, water cooled,
Kubota Model V2203-M diesel engine
. This engine is
designed to meet every performance requirement for the
generator. Reference Table 1 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.
Electric 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.