Multiquip operation manual DCA-800SSK General Information

DCA-800SSK — GENERAL INFORMATION

DCA-600SSK FAMILIARIZATION

Generator

The MQ Power Model DCA-800SSK is a 640 kW generator that has been 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 Control Panel

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

Tachometer

Water Temperature Gauge

Oil Pressure Gauge

Oil Filter Alarm Lamp

Charging Ammeter Gauge

Engine Warning Lamp Module

Air Cleaner Indicator

Engine Speed Switch

Pre-Heat Button

Pre-Heat Lamp

Emergency Stop Button

Battery 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

Panel Light

Panel Light Switch

MPEC Module

Circuit Breaker ON/OFF Lamps

Circuit Breaker ON Switch

Circuit Breaker Reset Switch

Pilot Lamp

Microprocessor Controlled Alarm System

The DCA-800SSK generator is equipped with various alarms and LED status indicators. These alarms and status indicators are provided to add safety to the generator when operating under normal conditions. The DCA-800SSK generator is designed to shutdown in the event of low oil, high coolant temperature, low battery and other operation conditions that may cause severe damage to the generator.

Open Delta Excitation System

The DCA-800SSK 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 up to the horsepower of the engine.

Engine

The DCA-800SSKis powered by a 6 cylinder, water cooled, turbocharged KOMATSU Model SA12V140 diesel engine. This engine is designed to meet every performance requirement for the generator. Reference Table 2 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-800SSK generator are addressed on the following pages.

Electronic Governor System

The electronic governor system is made up of two parts, an electronic controller that monitors frequency variation as the load increases and decreases, and an electronic actuator that controls the engine throttle. The frequency is regulated at ±0.25 to help protect sensitive equipment.

PAGE 26 — DCA-800SSK (STD) — OPERATION AND PARTS MANUAL — REV. #4 (06/03/10)