DCA-20SPX — GENERAL INFORMATION

DCA-20SPXWhisperwatt™ Series Familiarization

Generator

The MQ Power Model DCA-20SPX is a 20 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

Water Temperature Gauge

Oil Pressure Gauge

Charging Ammeter Gauge

Fuel Level Gauge

Panel Light/Panel Light Switch

Auto ON/OFF Engine Controller (MPEC)

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

Voltage Regulator

3-Pole, 90 amp Main Circuit Breaker

“Control Box” (located behind the Gen. Control Panel)

Automatic Voltage Regulator

Current Transformer

Over-Current Relay

Voltage Rectifer

Starter Relay

Engine Controller (Computer Controlled)

Voltage Selector Switch

Output Terminal Panel

The “Output Terminal Panel” is provided with the following:

Two 120/240V output receptacles (CS-6369), 50A

Two auxilliary circuit breakers, (for CS-6369), 50A

Two 120V output receptacles (GFCI), 20A

Two GFCI circuit breakers, 20A

Four output terminal lugs (1Ø power)

Battery Charger (Optional)

Water Heater (Optional)

Open Delta Excitation System

The DCA-20SPX 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-20SPXis powered by a 4 cylinder, water cooled, direct injection, Isuzu Model AA-4LE2 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.

PAGE 20 — DCA-20SPX— OPERATION AND PARTS MANUAL — REV. #2 (04/14/10)

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Multiquip DCA-20SPX Engine Operating Panel, Generator Control Panel, Output Terminal Panel, Electric Governor System

DCA-20SPX specifications

The Multiquip DCA-20SPX is a versatile and robust portable generator designed to meet the power demands of various applications, from construction sites to outdoor events. Boasting a compact and lightweight design, this generator is engineered to offer exceptional performance in a multitude of environments.

One of the standout features of the DCA-20SPX is its reliable power output. Powered by a reliable diesel engine, the generator delivers a continuous output of 20 kVA, making it suitable for both small and medium-sized operations. This generator is particularly favored for its efficient fuel consumption, allowing users to operate for extended periods without frequent refueling.

Another key characteristic of the DCA-20SPX is its advanced inverter technology, ensuring stable and clean power suitable for sensitive electronic equipment. This technology effectively minimizes harmonic distortion, providing an output that is safe for powering computers, medical devices, and other electronics requiring a stable power supply.

The generator’s user-friendly control panel is designed for ease of operation. It features clear displays and intuitive controls, allowing operators to monitor key performance indicators like voltage, frequency, and hour meter with ease. Additionally, the panel includes multiple outlet options, accommodating various plug types, which enhances its versatility on job sites.

Durability is a hallmark of the Multiquip DCA-20SPX’s design. The generator is built with a sturdy steel frame and finished with weather-resistant coatings, enabling it to withstand the rigors of outdoor usage in challenging conditions. Its integrated handling features, such as fork pockets and lifting eyes, also facilitate easy transport and setup.

For user safety, the DCA-20SPX is equipped with essential protection features. It includes low oil shutdown, overload protection, and thermal shutdown, which collectively safeguard the generator from potential damage, ensuring long operational life and reliability.

Overall, the Multiquip DCA-20SPX excels in providing reliable energy solutions for various applications, adorned with advanced technologies, user-friendly features, and a robust build. Whether for construction, emergency power supply, or remote events, it stands as a trusted ally for those who require efficient and dependable power on demand.