General Information

GENERATOR

This MQ Power Model generator (Figure 3) is 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

Warning Lamp

Pre-Heat Lamp

Oil Pressure Gauge

Charging Ammeter Gauge

Fuel Level Gauge

Fuel Leak Detection Lamp

Panel Light/Panel Light Switch

ECU Controller

Engine Speed Switch

Warning Lamp (Diagnostic Lamp)

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

3-Pole, 350 amp Main Circuit Breaker

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

•Automatic Voltage Regulator

•Current Transformer

•Over-Current Relay

•Starter Relay

•Voltage Selector Switch

•Diagnostic Switch

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

Five output terminal lugs (3Ø power)

Battery Charger (Optional)

Jacket Water Heater (Optional)

Low Coolant Level Switch

OPEN DELTA EXCITATION SYSTEM

This 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 “ﬁxed ceiling” and responds according the demands of the required load.

ENGINE

The DCA125USI is powered by a 4 cylinder, water cooled, direct injection, turbocharged ISUZU 4HK1X 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 — DCA125USI 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #1 (03/25/11)

DCA125USI specifications

The Multiquip DCA125USI is a high-performance portable diesel generator renowned for its reliability, efficiency, and robust construction, making it an ideal choice for construction sites, events, and remote locations requiring continuous power. Engineered for durability, this generator features a solid and compact design that allows seamless transport while providing ample power to meet demanding applications.

One of the standout features of the DCA125USI is its powerful 125 kVA output, capable of supplying electricity to a wide range of equipment simultaneously. With a fuel-efficient Tier 4 compliant engine, this generator not only delivers high performance but also addresses environmental concerns through reduced emissions. Operating at low noise levels, the DCA125USI ensures a quieter work environment, making it suitable for urban areas and noise-sensitive locations.

In terms of technology, the DCA125USI is equipped with a state-of-the-art digital control panel that offers advanced monitoring capabilities, allowing users to easily track the generator's performance, fuel consumption, and overall health. This user-friendly interface simplifies operation and enhances the overall experience for users, whether they are seasoned professionals or first-time operators. Additionally, the generator is fitted with automatic voltage regulation (AVR), which provides stable power output, protecting connected equipment from voltage fluctuations.

Safety is a priority with the Multiquip DCA125USI, as evidenced by its comprehensive set of protection features, including low oil pressure shutdown, high-temperature shutdown, and overload protection. These safety mechanisms ensure the longevity of the engine and the generator's components while safeguarding connected equipment against potential damage.

Another notable characteristic is its large fuel tank, which allows for extended run times, reducing the need for frequent refueling. This feature is particularly beneficial in situations where access to fuel is limited or where continuous operation is critical.

In conclusion, the Multiquip DCA125USI is a versatile and dependable portable diesel generator, catering to a wide variety of applications. Its combination of high output, advanced technology, and robust safety features make it an excellent investment for contractors, event organizers, and anyone in need of reliable power in challenging environments. With this generator, users can have peace of mind knowing they have a powerful energy solution at their disposal.