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DCA-500SSK — PARTS AND OPERATION MANUAL (STD)— REV. #1 (04/14/01) — PAGE 27
DCA-500SSK — GENERAL INFORMATION
DCA-500SSK FAMILIARIZATION
Generator
The MQ Power Model DCA-500SSK is a 550 kW
genergener
genergener
gener
atorator
atorator
ator
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:
z
Tachometer
z
Water Temperature Gauge
z
Oil Pressure Gauge
z
Charging Ammeter Gauge
z
Engine Warning Lamp Module
z
Throttle Lever
z
Engine Speed Switch
z
Pre-Heat Button
z
Pre-Heat Lamp
z
Emergency Stop Button
z
Battery Switch
Generator Control Panel
The “Generator Control Panel” is provided with the following:
z
Output Voltage Adjustment Knob
z
Frequency Meter (Hz)
z
AC Ammeter (Amps)
z
AC Voltmeter (Volts)
z
Ammeter Change-Over Switch
z
Voltmeter Change-Over Switch
z
Panel Light
z
Panel Light Switch
z
MPEC Module
z
Pilot Lamp
Microprocessor Controlled Alarm System
The DCA-500SSK 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-500SSK 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-500SSK generator is equipped with the state of
the art "
Open-DeltaOpen-Delta
Open-DeltaOpen-Delta
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
AA
AA
A
utomatic utomatic
utomatic utomatic
utomatic
VV
VV
V
oltage Regulator oltage Regulator
oltage Regulator oltage Regulator
oltage 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 ceilingfixed ceiling
fixed ceilingfixed ceiling
fixed ceiling
" and responds
according the demands of the required load.
Engine
The DCA-500SSK is powered by a 4 cycle, water cooled,
turbocharged KOMATSU Model SA6D170BE 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 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-500SSK
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.