Multiquip DCA85SSJU - Manual (Page 24)

PAGE 24 — DCA-85SSJU — PARTS AND OPERATION MANUAL — REV. #2 (12/21/01)
DCA-85SSJU — GENERAL INFORMATION
DCA-85SSJU FAMILIARIZATION
Generator
The MQ Power Model DCA-85SSJU is a 68 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 Control Panel
The “Engine Control Panel” is provided with the following:
 Tachometer
 Water Temperature Gauge
 Oil Pressure Gauge
 Charging Ammeter Gauge
 Engine Speed Switch
 Microprocessor Engine Controller (engine controller)
 Pre-Heat Button
 Panel Light
 Panel Light 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
Output Terminal Panel
The “Output Terminal Panel” is provided with the following:
 Three 240/139V output receptacles, 50 amp
 Two 120V input receptacles, 20 amp
 3 Load Circuit Breakers 265V @65 amps
 2 Load GFCI Circuit Breakers 265V@ 20amps
Control Box
The “Control Box” is provided with the following:
 Main Circuit Breaker 250 amps
 Over-Current Relay
Engine
The DCA-85SSJU is powered by a 4 cycle, water cooled,
turbocharged JOHN DEERE Model 4045TF 250
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-85SSJU
generator are addressed on the following pages.
Open Delta Excitation System
The DCA-85SSJU 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.
Microprocessor Controlled Alarm System
The DCA-85SSJU 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-85SSJU
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 engine.