Multiquip DCA45USI User Manual download pdf (Page 20)

PAGE 20 — DCA-45USI — OPERATION AND PARTS MANUAL (STD) — REV. #2 (04/22/05)

DCA-45USI — GENERAL INFORMATION

DCA-45USI FAMILIARIZATION

Generator

The MQ Power Model DCA-45USI (Figure 4) is a 36 kW

generator

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/ Alarm Lamp

Oil Pressure Gauge/ Alarm Lamp

Charging Ammeter Gauge

Pre-Heat Lamp

Panel Light

Panel Light Switch

Ignition/Preheat Switch

Fuel Gauge

Fuel Filter Water Level Alarm Lamp

Generator Control Panel

The “Generator Control Panel” is provided with the following:

Output Voltage Adjustment Knob

Frequency Meter (Hz)

AC Ammeter (Amps)

AC Voltmeter (Volts)

Ammeter Change-Over Switch

Voltmeter Change-Over Switch

Voltage Regulator

3-Pole, 110 amp Main Circuit Breaker

Output Terminal Panel

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

Three 120/240V output receptacles (CS-6369), 50 amps

Three auxilliary circuit breakers, @50 amps

Two 125 VAC output receptacles, (GFCI), 20 amps

Two GFCI circuit breakers @ 20amps

Five output terminal lugs (3Ø power)

Control Box

The “Control Box” is provided with the following:

Automatic Voltage Regulator

Current Transformer

Emergency Relay

Over-Current Relay

Open Delta Excitation System

The DCA-45USI 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-45USI is powered by a 4 cycle, water cooled, turbocharged

Isuzu BB-4JG1T

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.

The basic controls and indicators for the DCA-45USI generator are

addressed on the following pages.

Mechanical Governor System

The mechanical governor system control the RPM of the engine.

When the engine demands increase or decrease, the mechanical

governor system regulates the frequency variation to within ±.5%.

The electronic governor option decreases the frequency variation

to within ±0.25%.

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 5 ) as a guide for selecting proper extension cable size.

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Multiquip DCA45USI User Manual Page 20

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