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GENERATOR
The MQ Power Model DCA400SSI is a 320 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.
ENGINE OPERATING PANEL
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)
GENERATOR CONTROL PANEL
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, 1,000 amp Main Circuit Breaker
“Control Box” (located behind the Gen. Control Panel)
• Automatic Voltage Regulator
• Current Transformer
• Over-Current Relay
• Voltage Rectifi er
• Starter Relay
• Engine Controller (Computer Controlled)
• Voltage Change-Over Board
OUTPUT TERMINAL PANEL
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)
GENERAL INFORMATION
OPEN DELTA EXCITATION SYSTEM
The DCA400SSI 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 rectifi ed 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 confi guration 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 “fi xed ceiling” and responds according the demands of the required load.
ENGINE
The DCA400SSI is powered by a 6 cylinder, water cooled, direct injection, turbocharged air-to-air ISUZU 6WG1X
Diesel Engine. This engine is designed to meet every performance requirement for the generator. Reference
Table 2 for engine specifi cations.
In keeping with MQ Power’s policy of constantly improving its products, the specifi cations quoted herein are subject to change without prior notice.
ELECTRIC GOVERNOR SYSTEM
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%.
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.
PAGE 16 — DCA400SSI GENERATOR • OPERATION AND PARTS MANUAL — REV. #2 (11/03/08)
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