MQ Power WHISPERWATT DCA45SSIU4F, Operation Manual

PAGE 14 — DCA45SSIU4F 60 HZ GENERATOR • OPERATION MANUAL — REV. #5 (02/28/20)

GENERATOR

This generator (Figure 3) 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.

OPERATING PANEL

The “Operating Panel” is provided with the following:

„

ECU Controller with Gauge Unit Assembly

• Oil Pressure Gauge
• Water Temperature Gauge
• Charging Voltmeter
• Fuel Gauge
• Tachometer

„

Panel Light/Panel Light Switch

„

Pre-Heat Lamp

„

Warning Lamp (Diagnostic)

„

Hour Meter

„

Engine Speed Switch

„

Auto Start/Stop Switch

„

Fuel Leak Detected Alarm Lamp

CONTROL PANEL

The “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, 110-amp Main Circuit Breaker

„

“Control Box” (located behind Control Panel)

• Automatic Voltage Regulator
• Current Transformer
• Overcurrent Relay
• Starter Relay

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 (Option)

„

Jacket Water Heater (Option)

„

Low Coolant Switch (Option)

OPEN-DELTA EXCITATION SYSTEM

Each generator is equipped with the state-of-the-art 

“Open-Delta”

 excitation system. The open-delta system 

consists 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 open-delta design provides virtually unlimited excitation 

current, offering maximum motor starting capabilities. The 

excitation does not have a 

“fixed ceiling”

 and responds 

according to the demands of the required load.

ENGINE

This generator is powered by a 4-cylinder, 4-cycle, 

water-cooled, direct injection, turbocharged, EGR, DOC, 
Isuzu

 4LE2X

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.

MICROPROCESSOR CONTROL SYSTEM

The microprocessor controls the RPMs of the engine. When the 

engine demand increases or decreases, the microprocessor 

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 the proper extension cable size.

GENERAL INFORMATION