Multiquip MQ Power 60 HZ Generator DCA125USI - Manual (Page 16)

PAGE 16 — DCA125USI 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #1 (03/25/11)
GENERATOR
This MQ Power Model generator (Figure 3) is 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
 Warning Lamp
 Pre-Heat Lamp
 Oil Pressure Gauge
 Charging Ammeter Gauge
 Fuel Level Gauge
 Fuel Leak Detection Lamp
 Panel Light/Panel Light Switch
 ECU Controller
 Engine Speed Switch
 Warning Lamp (Diagnostic Lamp)
GENERATOR CONTROL PANEL
The “Generator Control Panel” is provided with the following:
 Frequency Meter (Hz)
 AC Ammeter (Amps)
 AC Voltmeter (Volts)
 Ammeter Change-Over Switch
 Voltmeter Change-Over Switch
 Voltage Regulator
 3-Pole, 350 amp Main Circuit Breaker
 “Control Box” (located behind the Gen. Control Panel)
• Automatic Voltage Regulator
• Current Transformer
• Over-Current Relay
• Starter Relay
• Voltage Selector Switch
• Diagnostic Switch
OUTPUT TERMINAL PANEL
The “Output Terminal Panel” is provided with the following:
 Three 120/240V output receptacles (CS-6369), 50A
 Three auxiliary circuit breakers, 50A
 Two 120V output receptacles (GFCI), 20A
 Two GFCI circuit breakers, 20A
 Five output terminal lugs (3Ø power)
 Battery Charger (Optional)
 Jacket Water Heater (Optional)
 Low Coolant Level Switch
OPEN DELTA EXCITATION SYSTEM
This 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 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 rectifi ed 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 confi guration 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 open-delta design provides virtually unlimited excitation
current, offering maximum motor starting capabilities. The
excitation does not have a “fi xed ceiling” and responds
according the demands of the required load.
ENGINE
The DCA125USI is powered by a 4 cylinder, water cooled,
direct injection, turbocharged ISUZU 4HK1X diesel engine.
This engine is designed to meet every performance
requirement for the generator. Reference Table 2 for engine
specifi cations.
In keeping with MQ Power’s policy of constantly improving
its products, the specifi cations 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%.
EXTENSION CABLES
When electric power is to be provided to various tools or
loads at some distance from the generator, extension cords
are normally used. Cables should be sized to allow for
distance in length and amperage so that the voltage drop
between the generator and point of use (load) is held to
a minimum. Use the cable selection chart (Table 6) as a
guide for selecting proper extension cable size.
GENERAL INFORMATION