DCA-600SSV General Information

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:

■Tachometer/Hour Meter Gauge

■Water Temperature Gauge / Water Temp. Alarm Lamp

■Oil Pressure Gauge / Oil Pressure Alarm Lamp

■Charging Alarm Lamp

■Fuel Level Gauge / Low Fuel Warning Alarm Lamp

■Pre-Heat Button / Pre-Heat Lamp

■Air Filter Alarm Lamp

■Engine Speed Switch

■Battery Switch

■Emergency Stop Button

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, 1,600 amp Main Circuit Breaker

■Engine Control Unit (Computer Controlled)

■“Control Box” (Located Behind Gen. Control Panel)

■Automatic Voltage Regulator

■Current Transformer

■Over-Current Relay

■Voltage Rectifer

■Starter Relay

■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 auxilliary circuit breakers, 50A

■Two 120V output receptacles (GFCI), 20A

■Two GFCI circuit breakers, 20A

■Four output terminal boards (3Ø power)

■Ground terminal

■Battery Charger (Optional)

■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-600SSVis 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.

PAGE 20 — DCA-600SSV — OPERATION AND PARTS MANUAL — REV. #0 (07/13/09)