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PAGE 24 — DCA-40SSAI — PARTS AND OPERATION MANUAL — FINAL COPY (07/09/01)
DCA-40SSAI — GENERAL INFORMATION
DCA-40SSAI FAMILIARIZATION
Generator
The MQ Power Model DCA-40SSAI is a 26 kW
genergener
genergener
gener
atorator
atorator
ator
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:
z
Tachometer
z
Water Temperature Gauge
z
Oil Pressure Gauge
z
Charging Ammeter Gauge
z
Fuel level gauge
z
Engine Speed Control
z
Pre-Heat Button
z
Panel Light
z
Panel Light Switch
z
Starter /Preheat 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
Voltage Regulator
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
z
Two 120V, 20A receptacles
z
Two 240V, 20A receptacles
z
One twist-lock 120V, 50A receptacle
z
50A and 30A circuit breakers
Control Box
The “Control Box” is provided with the following:
z
Main Circuit Breaker 100 amps
z
Over-Current Relay
Engine
The DCA-40SSAI is powered by a 4 cycle, water cooled,
Isuzu 4BD1
diesel diesel
diesel diesel
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 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-40SSAI
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
variation to ±1.5%. The electronic governor option in-
creases frequency variation to ±.25%.
Open Delta Excitation System
The DCA-40SSAI 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.