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The MQ Power DCA300SSC and DCA300SSCU
generators (Figure 3) are 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.
The “Engine Operating Panel” is provided with the following:
Tachometer
Emergency Stop Switch
Water Temperature Gauge
Oil Pressure Gauge
Charging Ammeter Gauge
Fuel Level Gauge
Pre-Heat Lamp
Engine Speed Switch
Battery Switch
Engine Alarm Lamps (5)
The “Generator Control Panel” is provided with the following:
Frequency Meter (Hz)
AC Ammeter (Amps)
AC Voltmeter (Volts)
Ammeter Change-Over Switch
Voltmeter Change-Over Switch
Voltage Regulator
Panel Light/Panel Light Switch
3-Pole, 800 amp Main Circuit Breaker
“Control Box” (located behind the Gen. Control Panel)
•Automatic Voltage Regulator
•Current Transformer
•Over-Current Relay
•Starter Relay
•Engine Controller (Computer Controlled)
The “Output Terminal Panel” is provided with the following:
Three 120/240V output receptacles (CS-6369), 50A
Three auxiliary circuit breakers, 50A
Two 120V output receptacles (GFCI), 20A
Two GFCI circuit breakers, 20A
Eight output terminal lugs (3Ø power)
Battery Charger (Optional)
Water Heater (Optional)
Each generator is equipped with the state of the art
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.
Both generators are powered by a 6 cylinder, 4-cycle water
cooled, direct injection, turbocharged, charge air cooled
Cummins QSL9-G3 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.
The electric governor system controls the RPMs of the engine.
When the engine demand increases or decreases, the
governor system regulates the frequency variation to ±.25%.
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.
GENERAL INFORMATION