PAGE 18 — DCA1100SSC 60 HZ GENERATOR • OPERATION MANUAL — REV. #1 (01/17/18)
GENERATOR
The MQ Power Model DCA1000SSC is a 880 kW generator
(Figure 5) that is designed as a high quality portable power
source for telecom sites, lighting facilities, power tools,
submersible pumps and other industrial and construction
machinery.
ENGINE CONTROL PANEL
The “Operating Panel” is provided with the following:
ECU 750 Controller
Gauge Unit Assembly
• Oil Pressure Gauge
• Water Temperature Gauge
• Charging Voltmeter
• Fuel Gauge
• Tachometer
Panel Light/Panel Light Switch
Pre-Heat Lamp
Fuel Level Alarm Lamp
Pre-Alarm Lamp
Shutdown Lamp
Hour Meter
Engine Speed Switch
Auto Start/Stop Switch
Pre-Heat Button
Emergency Stop Button
GENERATOR CONTROL PANEL
The “Generator Control Panel” is provided with the following:
Frequency Meter (Hz)
AC Ammeter (Amps)
AC Voltmeter (Volts)
Ammeter ChangeOver Switch
Voltmeter ChangeOver Switch
Voltage Regulator
Panel Light/Panel Light Switch
3-Pole, 1600 amp Main Circuit Breaker
“Control Box” (Located behind the Gen. Control Panel)
• Automatic Voltage Regulator
• Current Transformer
• OverCurrent Relay
• Voltage Rectifier
• Starter Relay
OUTPUT TERMINAL PANEL
The “Output Terminal Panel” is provided with the following:
Four bus bars with terminal lugs (3Ø power)
Battery Charger (Optional)
Jacket Water Heater (Optional)
OPEN DELTA EXCITATION SYSTEM
This generator is equipped with the state of the art
“OpenDelta” excitation system. The open delta system
consist of an electrically independent winding wound
among stationary windings of the AC output section.
There are four connections of the open delta A, B, C and
D. During steady state loads, the power from the voltage
regulator is supplied from the parallel connections of A to
B, A to D, and C to D. These three phases of the voltage
input to the voltage regulator are then rectified and are the
excitation current for the exciter section.
When a heavy load, such as a motor starting or a short
circuit occurs, the automatic voltage regulator (AVR)
switches the configuration of the open delta to the series
connection of B to C. This has the effect of adding the
voltages of each phase to provide higher excitation to the
exciter section and thus better voltage response during the
application of heavy loads.
The connections of the AVR to the AC output windings are
for sensing only. No power is required from these windings.
The opendelta 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 DCA1100SSC generator is powered by a 12 cylinder,
water cooled, direct injection, turbocharged, charged air-
cooled CUMMINS QST30-G5 diesel engine. This engine
is designed to meet every performance requirement for
the generator. Reference Table 2 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.
ELECTRIC GOVERNOR SYSTEM
The electric governor system controls the RPMs of the engine.
When the engine demand increases or decreases, the
governor system regulates the frequency variation to ±.25%.
LOAD CABLES
When connecting load to generator be sure to select correct
size of cables to handle full load/amperage (1323 amps
@480 VAC).
GENERAL INFORMATION