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