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PAGE 18 — DCA-300SSK SERIES — PARTS AND OPERATION MANUAL (STD) — REV. #4 (03/27/06)
DCA-300SSK SERIES — GENERAL INFORMATION
DCA-300SSK FAMILIARIZATION
Generator
The MQ Power DCA-300SSK series generators are
240 kW
generators
that are 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
Throttle Handle (Up to S/N 3701673)
z
Water Temperature Gauge
z
Oil Pressure Gauge
z
Charging Ammeter Gauge
z
Engine Warning Display Module
z
Engine Speed Switch (S/N 3701674~)
z
Pre-Heat Button
z
Pre-Heat Lamp
z
Emergency Stop Button
z
Battery Switch
z
Auto On/Off Engine Controller (S/N 3701674~)
z
Ignition Switch (Up to S/N 3701673)
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
Pilot Lamp
Output Terminal Panel
The “
Output Terminal Panel
” is provided with the following:
z
3 auxiliary 240/139V output receptacles, 50 amp
z
3 auxiliary circuit breakers 240V @50 amps
z
2 120V GFCI receptacles, 20 amp
z
2 GFCI circuit breakers 120V@ 20amps
Control Box
The “
Control Box
” is provided with the following:
z
Main Circuit Breaker 800 amps
z
Over-Current Relay
Open Delta Excitation System
The DCA-300SSK series generators are 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-300SSK is powered by a 4 cycle, water cooled,
turbocharged KOMATSU Model SA6D125E-2
diesel
engine.
The DCA-300SSK2 and DCA-300SSK3 are powered by a 4
cycle, water cooled, air to air after cooled, turbocharged
KOMATSU Model SAA6D125E-2
diesel
engine. These
engines are 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-300SSK series
generators are addressed on the following pages.
Electronic Governor System
The DCA300SSK2 is equipped with an electronic governor
system. It 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. Thr frequency is regulated at ±0.25 to help protect
sensitive equipment.
Microprocessor Engine Control (MPEC)
The DCA300SSK3 incorporates the use of a
microprocessor
engine controller
unit (MPEC), which monitors basic engine
functions and also allows the generator to operate in an
unattended mode.