Multiquip DCA25SSIU manual DCA-25SSIU General Information

DCA-25SSIU — GENERAL INFORMATION

DCA-25SSIU FAMILIARIZATION

Generator

The MQ Power Model DCA-25SSIU is a 20 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

Oil Pressure Gauge

Charging Ammeter Gauge

Fuel level gauge

Engine Throttle Lever

Pre-Heat Light

Alarm Lights

Panel Light

Panel Light Switch

Starter Switch

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

Main Circuit Breaker 60 amps

Over-Current Relay

Output Terminal Panel

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

Three 120V output receptacles, 50 amp

Two 120V output receptacles, 20 amp

3 Circuit Breakers 240V @65 amps

2 GFCI Circuit Breakers 120V@ 20amps

Open Delta Excitation System

The DCA-25SSIU 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 AutomaticVoltage 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-25SSIUis powered by a 4 cycle, water cooled, turbocharged Isuzu QD60(C640) diesel engine.This engine is designed to meet every performance requirement for the generator. Reference Table 5, page 19 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-25SSIU 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 to ±5%. The electronic governor option limits frequency fluctuation to ±0.25%.

PAGE 20 — DCA-25SSIU — PARTS AND OPERATION MANUAL(STD) — REV. #7 (04/18//12)