Multiquip operation manual DCA-40SSAI General Information

DCA-40SSAI — GENERAL INFORMATION

DCA-40SSAI FAMILIARIZATION

Generator

The MQ Power Model DCA-40SSAI is a 26 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:

zTachometer

zWater Temperature Gauge

zOil Pressure Gauge

zCharging Ammeter Gauge

zFuel level gauge

zEngine Speed Control

zPre-Heat Button

zPanel Light

zPanel Light Switch

zStarter /Preheat Switch

Generator Control Panel

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

zOutput Voltage Adjustment Knob

zFrequency Meter (Hz)

zAC Ammeter (Amps)

zAC Voltmeter (Volts)

zAmmeter Change-Over Switch

zVoltmeter Change-Over Switch

zVoltage Regulator

Output Terminal Panel

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

Open Delta Excitation System

The DCA-40SSAI 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 leads: A, B, C and D. During light loads, the power to the Automatic Voltage Regulator (AVR) is supplied from the leads parallel connections of B&C. When loads increase, the AVR switches and accepts power from leads A&D. The output of leads A&D increase proportionally with load. This of adding the voltages to each phase provides better voltage response during 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-40SSAIis powered by a 4 cycle, water cooled, Isuzu 4BD1 diesel engine.This engine is designed to meet every performance requirement for the generator. Reference Table 7, page 23 for engine specifications.

In keeping with Multiquip'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-40SSAI generator are addressed on the following pages.

zTwo 120V, 20A receptacles

zTwo 240V, 20A receptacles

zOne twist-lock 120V, 50A receptacle

z50A and 30A circuit breakers

Control Box

The “Control Box” is provided with the following:

zMain Circuit Breaker 100 amps

zOver-Current Relay

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 ±1.5%. The electronic governor option in- creases frequency variation to ±.25%.

PAGE 24 — DCA-40SSAI — PARTS AND OPERATION MANUAL — FINAL COPY (07/09/01)