MQ Power WHISPERWATT DCA10SPX4 User manual

OPERATION MANUAL
THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
WHISPERWATT™ SERIES
MODEL
DCA10SPX4
DCA10SPXU4
60 Hz GENERATOR
(KUBOTA D1503-M DIESEL ENGINE)
INSTRUCTION MANUAL NO. B0844305404 (DCA10SPX4)
INSTRUCTION MANUAL NO. M0844300104 (DCA10SPXU4)
Revision #2 (10/11/22)
To find the latest revision of this publication or
associated parts manual, visit our website at:
www.mqpower.com

PAGE 2 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
PROPOSITION 65 WARNING

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 3
TABLE OF CONTENTS
DCA10SPX4
DCA10SPXU4
60 Hz Generator
Proposition 65 Warning ........................................... 2
Table of Contents..................................................... 3
Safety Decals .......................................................... 4
Safety Information ............................................. 5–10
Specifications ........................................................ 11
Dimensions............................................................ 12
Installation ....................................................... 14–15
General Information............................................... 16
Major Components ................................................ 17
Control and Operation Panel ........................... 18–19
Output Receptacle Panel Familiarization......... 20–21
Load Application.............................................. 22–23
Inspection/Setup.............................................. 24–28
Generator Start-Up Procedure ........................ 29–30
Generator Shutdown Procedure............................ 31
Maintenance.................................................... 32–40
Troubleshooting (Diagnostics) ............................... 41
Troubleshooting (Generator).................................. 42
Troubleshooting (Engine)................................. 43–44
Generator Wiring Diagram
(DCA10SPX4/B0814009503)................................ 46
Engine Wiring Diagram
(DCA10SPX4/B0814107003)................................ 47
Generator Wiring Diagram
(DCA10SPXU4/B0814000113A)........................... 48
Engine Wiring Diagram
(DCA10SPXU4/B0814100003) ............................. 49
Battery Charger Wiring Diagram (Option) ............. 50
Engine Block Heater Wiring Diagram (Option) ...... 51
NOTICE
Specifications are subject to change without notice.

PAGE 4 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
SAFETY DECALS
Safety decals are attached to the generator as shown in
Figure 1. Keep these safety decals clean at all times.When
the safety decals become worn or damaged, contact your
nearest dealer or the Multiquip Parts Department.
NOTICE
For safety decal part numbers, refer to the associated
parts manual.
Figure 1. Safety Decals
TOP VIEW
CAUTION
Maximum capacity of lifting
bail is 2,000 lb.
M05100030
M90320000
WARNING
ENGINE EXHAUST can cause
severe injury or death.
Use only in open, well
ventilated areas or
vent exhaust outside.
FRONT VIEW
M90300000
WARNING
MOVING PARTS can cause
severe injury.
DO NOT operate with doors
open.
Stop engine before servicing.
SIDE VIEW
ON BASE
M91010000
CAUTION
HOT PARTS can burn skin.
DO NOT touch until the
machine has sufficiently
cooled.
CAUTION
DO NOT
OPERATE WITH
DOORS OPEN M90440000
CAUTION
OIL LEVEL
M90400000
M92010000
WARNING
ELECTRIC SHOCK HAZARD
Do not touch internal wiring
or connections while this
machine is operating.
Turn power off before
servicing.
CONTROL PANEL
DANGER
HIGH VOLTAGE
M92210000
DANGER
Using a generator indoors CAN KILL YOU IN MINUTES.
120
V
OFF
GAC-2.2H
POWEREDby
HondaEngines
120V
15A
GRPRISEDE
TERRE
ACCIRCUITBREAKER
INTERRUPTEURDE
COURANTPRINCIPAL
NEUTRALBONDEDTOFRAME
NEUTREMISALAMASSEA
LACARCASSEDUMOTEUR
211052
120
V
OFF
GAC-2.2H
POWEREDby
HondaEngines
120V
15A
GRPRISEDE
TERRE
ACCIRCUITBREAKER
INTERRUPTEURDE
COURANTPRINCIPAL
NEUTRALBONDEDTOFRAME
NEUTREMISALAMASSEA
LACARCASSEDUMOTEUR
211052
120
V
OFF
GAC-2.2H
POWEREDby
HondaEngines
120V
15A
GRPRISEDE
TERRE
ACCIRCUITBREAKER
INTERRUPTEURDE
COURANTPRINCIPAL
NEUTRALBONDEDTOFRAME
NEUTREMISALAMASSEA
LACARCASSEDUMOTEUR
211052
NEVER use inside a home
or garage. Even if doors
and windows are open.
ONLY use OUTSIDE and
far away from windows,
doors, and vents.
Generator exhaust contains carbon monoxide. This is
a poison gas you cannot see or smell.
Avoid other generator hazards.
READ MANUAL BEFORE USE.
M90320010
Operation of this equipment may create
sparks that can start fires around dry
vegetation.
A spark arrestor may be required.
The operator should contact local fire
agencies for laws or regulations
relating to fire prevention requirements.
M90420000
WARNING
INTERIOR WIRING
M91010020
M90310000
WARNING
HOT COOLANT can cause
severe burns.
Do not remove cap if
radiator is hot.
WARNING
DIESEL FUEL can cause
M90350000
fire or explosion.
Stop engine before fueling.
Keep cigarettes, sparks
and flame away.
.
.
GROUND ROD
FOR EARTH
GROUND
GENERATOR
GROUNDLUG
CONNECT TO
BUILDING
GROUND
(OPTION)
8 FT.MINIMUM
REFERENCE
NEC 250-52(C)
DANGER
THE POSSIBILITY EXISTS OF IF
GENERATOR/WELDER IS NOT PROPERLY GROUNDED.
ALWAYS CONNECT EARTH GROUND (GROUND
ROD) TO GENERATOR G.F.C.I. GROUND TERMINAL.
ELECTROCUTION
G.F.C.I
GROUND
STUD
GROUND
CABLE
#8 MINIMUM
FOR FURTHER GROUNDING
INSTRUCTIONS, READ MANUAL
M93110000
DANGER
Cigarettes, flames or sparks could cause battery to explode. Always
shield eyes and face from battery. Do not charge or use booster cables
or adjust post connections without proper instruction and training.
EXPLOSIVE GASES
KEEP VENTCAPS TIGHT AND LEVEL
POISON CAUSES SEVERE BURNS
Contains sulfuric acid.Avoid contact with skin, eyes or clothing. In
event of accident flush with water and call a physician immediately.
KEEP OUT OF REACH OF CHILDREN
M9504300004

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 5
SAFETY INFORMATION
Do not operate or service the generator before reading the
entire manual. Safety precautions should be followed at all
times when operating this generator. Failure to read and
understand the safety messages and operating instructions
could result in injury to yourself and others.
SAFETY MESSAGES
The four safety messages shown below will inform you
about potential hazards that could injure you or others.The
safety messages specifically address the level of exposure
to the operator and are preceded by one of four words:
DANGER, WARNING, CAUTION
or NOTICE.
SAFETY SYMBOLS
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in DEATH or SERIOUS INJURY.
WARNING
Indicates a hazardous situation which, if not avoided,
COULD result in DEATH or SERIOUS INJURY.
CAUTION
Indicates a hazardous situation which, if not avoided,
COULD result in MINOR or MODERATE INJURY.
NOTICE
Addresses practices not related to personal injury.
Potential hazards associated with the operation of this
generator will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
safety messages.

PAGE 6 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
SAFETY INFORMATION
GENERAL SAFETY
CAUTION

NEVER operate this generator without proper protective
clothing, shatterproof glasses, respiratory protection,
hearing protection, steel-toed boots and other protective
devices required by the job or city and state regulations.

NEVER operate this generator when not
feeling well due to fatigue or illness, or when
on medication.

NEVER operate this generator under the influence of
drugs or alcohol.

ALWAYS check the generator for loosened threads or
bolts before starting.

NEVER use the generator for any purpose other than
its intended purposes or applications.
NOTICE

This generator should only be operated by trained and
qualified personnel 18 years of age and older.

Whenever necessary, replace nameplate, operation and
safety decals when they become difficult to read.

Manufacturer does not assume responsibility for any
accident due to equipment modifications. Unauthorized
modification of the generator will void all warranties.

NEVER use accessories or attachments that are not
recommended by MQ Power for this generator. Damage
to the generator and/or injury to the user may result.

ALWAYS know the location of the nearest
fire extinguisher.

ALWAYS know the location of the nearest
first aid kit.
ALWAYS know the location of the nearest phone or keep
a phone on the job site.
Also, know the phone numbers
of the nearest ambulance, doctor, and
fire department.
This information will be invaluable in the case of an
emergency.
GENERATOR SAFETY
DANGER
NEVER operate the generator in an
explosive atmosphere or near combustible
materials. An explosion or fire could result
causing severe bodily harm or even death.
WARNING
NEVER disconnect any emergency or safety devices
.
These devices are intended for operator safety.
Disconnection of these devices can cause
severe injury,
bodily harm or even death
. Disconnection of any of
these devices will void all warranties.
CAUTION
NEVER
lubricate components or attempt service on a
running generator.
NOTICE
ALWAYS
ensure the generator is on level ground
before use.
ALWAYS
keep the generator in proper running condition.

Fix damage to the generator and replace any broken
parts immediately.
ALWAYS
store the generator properly when it is not
being used. The generator should be stored in a clean,
dry location out of the reach of children and unauthorized
personnel.

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 7
SAFETY INFORMATION
ENGINE SAFETY
DANGER

The engine fuel exhaust gases contain poisonous carbon
monoxide. This gas is colorless and odorless, and can
cause death if inhaled.

The engine of this generator
requires an adequate, free
flow of cooling air. NEVER
operate this equipment in
any enclosed or narrow area
where free flow of the air is
restricted. If the air flow is
restricted it will cause injury to people and property and
serious damage to the equipment or engine.

When operating the generator outdoors, DO NOT place
the generator near doors, windows or vents that could
allow carbon monoxide to enter and build up in occupied
spaces.
WARNING

NEVER place hands or fingers inside the engine
compartment when the engine is running.

NEVER operate the engine with heat shields or
guards removed.

Keep fingers, hands, hair and clothing away
from all moving parts to prevent injury.

NEVER operate the generator with the
doors open. Stop the engine before servicing.

DO NOT remove the radiator cap while the
engine is hot. High pressure boiling water
will gush out of the radiator and severely
scald any persons in the general area of
the generator.

DO NOT remove the coolant drain plug while the engine
is hot. Hot coolant will gush out of the coolant tank and
severely scald any persons in the general area of the
generator.

DO NOT drain the engine oil while the engine is hot. Hot
oil will gush out and severely scald any persons near
the generator.
Operation of the generator may create sparks that
can start fires around dry vegetation. A spark arrestor
may be required. The operator should contact local fire
agencies for laws or regulations relating to fire prevention
requirements.
CAUTION
NEVER touch the hot exhaust manifold,
muffler or cylinder. Allow these parts to cool
before servicing the generator.
NOTICE
NEVER
run the engine without an air filter or with a dirty
air filter. Severe engine damage may occur. Service the
air filter frequently to prevent engine malfunction.
NEVER tamper with the factory settings
of the engine or engine governor. Damage
to the engine or generator can result if
operating in speed ranges above the
maximum allowable.

Wet stacking is a common problem with diesel engines
which are operated for extended periods with light or
no load applied. When a diesel engine operates without
sufficient load (less than 30-35% of the rated output),
it will not operate at its optimum temperature. This will
allow unburned fuel to accumulate in the exhaust system,
which can foul the fuel injectors, engine valves and
exhaust system, including turbochargers, and reduce
the operating performance.
In order for a diesel engine to operate at peak efficiency,
it must be able to provide fuel and air in the proper ratio
and at a high enough engine temperature for the engine
to completely burn all of the fuel.
Wet stacking does not usually cause any permanent
damage and can be alleviated if additional load is
applied to relieve the condition. It can reduce the system
performance and increase maintenance. Applying an
increasing load over a period of time until the excess
fuel is burned off and the system capacity is reached
usually can repair the condition. This can take several
hours to burn off the accumulated unburned fuel.

PAGE 8 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
SAFETY INFORMATION
FUEL SAFETY
DANGER

NEVER start the engine near spilled fuel or combustible
fluids. Diesel fuel is extremely flammable and its vapors
can cause an explosion if ignited.

ALWAYS refuel in a well-ventilated area, away from
sparks and open flames.

ALWAYS use extreme caution when working with
flammable liquids.

NEVER fill the fuel tank while the engine is
running or hot.

NEVER overfill the fuel tank. Spilled fuel can ignite if it
comes into contact with hot engine parts or sparks from
the ignition system.

Store fuel in appropriate containers, in well-ventilated
areas and away from sparks and flames.

NEVER use fuel as a cleaning agent.

NEVER smoke around or near the
equipment. Fire or explosion could result
from fuel vapors or if fuel is spilled on a
hot engine.
TOWING SAFETY
CAUTION

Check with your local county or state safety
towing regulations, in addition to meeting
Department of Transportation (DOT)
SafetyTowing Regulations,before towing
your generator.

Refer to the MQ Power trailer manual for additional safety
information.

In order to reduce the possibility of an accident
while transporting the generator on public roads,
ALWAYS make sure that the trailer that supports the
generator and the towing vehicle are both mechanically
sound and in good operating condition.

ALWAYS shut down the engine before transporting.
Make sure the hitch and coupling of the towing
vehicle are rated equal to or greater than the trailer
gross vehicle weight rating.
ALWAYS
inspect the hitch and coupling for wear.
NEVER
tow a trailer with defective hitches, couplings,
chains, etc.

Check the tire air pressure on both the towing vehicle and
the trailer.
Inflate trailer tires as indicated on side wall
of tire.
Also check the tire tread wear on both vehicles.
ALWAYS
make sure the trailer is equipped with
safety chains.
ALWAYS properly
attach the trailer’s safety chains to
the towing vehicle.
ALWAYS
make sure the vehicle and trailer directional,
backup, brake, and trailer lights are connected and
working properly.
DOT requirements include the following:
• Connect and test electric brake operation.
• Secure portable power cables in cable tray with
tie wraps.
The maximum speed for highway towing is
55 MPH
unless posted otherwise. Recommended off-road towing
is not to exceed 15 MPH
or less depending on the type
of terrain.

Avoid sudden stops and starts.These can cause skidding
or jackknifing. Smooth, gradual starts and stops will
improve towing.
Avoid sharp turns to prevent rolling.

The trailer should be adjusted to a level position at all
times when towing.

Raise and lock the trailer wheel stand in the upright
position when towing.
Place chock blocks
underneath the wheels to prevent
rolling while parked.
Place support blocks
underneath the trailer’s bumper
to prevent tipping while parked.

Use the trailer’s swivel jack to adjust the trailer height to
a level position while parked.

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 9
SAFETY INFORMATION
ELECTRICAL SAFETY
DANGER

NEVER touch the output terminals
during operation. Contact with the
output terminals during operation can
cause electrocution, electrical shock,
or burn.

The electrical voltage required to
operate the generator can cause severe injury or even
death through physical contact with live circuits.Turn the
generator and all circuit breakers OFF before performing
maintenance on the generator or making contact with
the output terminals.

NEVER insert any objects into the output
receptacles during operation. This is
extremely dangerous.The possibility exists
of electrical shock,electrocution or death.

Backfeed to a utility system can cause
electrocution and/or property damage.
NEVER connect the generator to a
building’s electrical system without
a transfer switch or other approved
device. All installations should be
performed by a licensed electrician in accordance
with all applicable laws and electrical codes. Failure to
do so could result in electrical shock or burn, causing
serious injury or even death.
Power Cord/Cable Safety
DANGER

NEVER let power cords or cables lay in water.

NEVER stand in water while AC power from the
generator is being transferred to a load.

NEVER use damaged or worn cables or cords when
connecting equipment to the generator. Inspect the
insulation for cuts.

NEVER grab or touch a live power
cord or cable with wet hands. The
possibility exists of electrical shock,
electrocution or death.
Make sure power cables are securely connected to the
generator’s output receptacles. Incorrect connections
may cause electrical shock and damage to the generator.
NOTICE
ALWAYS
make certain that the proper power or
extension cord has been selected for the job. See the
Cable Selection Chart in this manual.
Grounding Safety
DANGER
ALWAYS
make sure that electrical circuits are properly
grounded to a suitable earth ground (ground rod) per
the National Electrical Code (NEC) and local codes
before operating the generator.
Severe injury or
death by electrocution
can result from operating an
ungrounded generator.
NEVER use gas piping as an electrical ground.
BATTERY SAFETY
DANGER
DO NOT
drop the battery. There is a possibility that the
battery will explode.
NEVER expose the battery to open flames,
sparks, cigarettes, etc.The battery contains
combustible gases and liquids. If these
gases and liquids come into contact with a
flame or spark, an explosion could occur.
WARNING
ALWAYS wear safety glasses when
handling the battery to avoid eye irritation.
The battery contains acids that can cause
injury to the eyes and skin.
Use well-insulated gloves when picking up the battery.
ALWAYS
keep the battery charged. If the battery is not
charged, combustible gas will build up.
ALWAYS
recharge the battery in a well-ventilated
environment to avoid the risk of a dangerous concentration
of combustible gases.

If the battery liquid (dilute sulfuric acid) comes into
contact with clothing or skin
, rinse skin or clothing
immediately with plenty of water.

PAGE 10 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
SAFETY INFORMATION
If the battery liquid (dilute sulfuric acid) comes into
contact with eyes, rinse eyes immediately with plenty
of water and contact the nearest doctor or hospital to
seek medical attention.
CAUTION

ALWAYS disconnect the NEGATIVE battery terminal
before performing service on the generator.

ALWAYS keep battery cables in good working condition.
Repair or replace all worn cables.
ENVIRONMENTAL SAFETY/DECOMMISSIONING
NOTICE
Decommissioning is a controlled process used to safely
retire a piece of equipment that is no longer serviceable.
If the equipment poses an unacceptable and unrepairable
safety risk due to wear or damage or is no longer cost
effective to maintain (beyond life-cycle reliability) and is to
be decommissioned (demolition and dismantlement), be
sure to follow the rules below:

NEVER pour waste or oil directly onto the ground, down
a drain, or into any water source.

Contact your country’s Department of Public
Works or recycling agency in your area and
arrange for proper disposal of any electrical
components, waste or oil associated with
this equipment.

When the life cycle of this equipment is over, remove
the battery and bring it to an appropriate facility for lead
reclamation. Use safety precautions when handling
batteries that contain sulfuric acid.

When the life cycle of this equipment is over, it is
recommended that the frame and all other metal parts
be sent to a recycling center.
Metal recycling involves the collection of metal from
discarded products and its transformation into raw
materials to use in manufacturing a new product.
Recyclers and manufacturers alike promote the process
of recycling metal. Using a metal recycling center
promotes energy cost savings.
EMISSIONS INFORMATION
NOTICE
The diesel engine used in this equipment has been
designed to reduce harmful levels of carbon monoxide
(CO), hydrocarbons (HC), and nitrogen oxides (NOx)
contained in diesel exhaust emissions.
This engine has been certified to meet US EPA evaporative
emissions requirements in the installed configuration.
Attempting to modify or make adjustments to the engine
emission system by unauthorized personnel without proper
training could damage the equipment or create an unsafe
condition.
Additionally, modifying the fuel system may adversely affect
evaporative emissions, resulting in fines or other penalties.
Emission Control Label
The emission control label is an integral part of the emission
system and is strictly controlled by regulations.
The label must remain with the engine for its entire life.
If a replacement emission label is needed, please contact
your authorized engine distributor.

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 11
SPECIFICATIONS
Table 1. Generator Specifications
Model DCA10SPX4 DCA10SPXU4
Type Revolving field, self-ventilated,open protected type synchronous generator
Armature Connection Series
Phase 1
Standby Output 11 kW (11 kVA)
Prime Output 10 kW (10 kVA)
1Ø Voltage (L-L/L-N) 240/120
Power Factor 1.0
Frequency 60 Hz
Speed 1,800 rpm
Aux. AC Power Single phase, 60 Hz
Aux. Voltage/Output 240/120V 4.8 kW (2.4 kW × 2)
Dry Weight 1,112 lb. (505 kg)
Wet Weight (Approx.) 1,300 lb. (590 kg)
Table 2. Engine Specifications
Model Kubota D1503-M
Type 4-cycle, water-cooled, swirl combustion chamber type
No. of Cylinders 3
Bore × Stroke 3.27 in. × 3.64 in. (83 mm × 92 mm)
Displacement 91.4 cu. in. (1,499 cc)
Rated Output 18.4 hp @ 1,800 rpm
Starting Electric
Coolant Capacity 1.85 gal. (7.0 liters)1
Lube Oil Capacity 1.48 gal. (5.6 liters)
Lube Oil Type API classification CF, CF-4, CG-4, CH-4, or CI-4
Fuel Tank Capacity 16.5 gal. (62 liters)
Fuel Type #2 diesel fuel (ultra-low sulfur diesel fuel only)
Fuel Consumption 0.98 gal. (3.7 L)/hr. at full load 0.75 gal. (2.8 L)/hr. at 3/4 load
0.58 gal. (2.2 L)/hr. at 1/2 load 0.44 gal. (1.7 L)/hr. at 1/4 load
Battery 24 (CCA 0°F 650A) × 1
1 Includes engine and radiator

PAGE 12 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
DIMENSIONS
10
SIDE VIEW
FRONT VIEW
TOP VIEW
MAXIMUM
LIFTING POINT
D
F
E
2,000 lb.
(907 kg)
A
C
B
Table 3. Dimensions
Reference
Letter Dimension in. (mm)
A 20.08 (510)
B 21.65 (550)
C 18.11 (460)
D 55.11 (1,400)
E 25.6 (650)
F 35.4 (900)
Figure 2. Dimensions

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 13
NOTES

PAGE 14 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
INSTALLATION
Figure 3. Typical Generator Grounding Application
GENERATOR
GROUND LUG
GROUND CABLE
GROUND ROD
REFERENCE
NEC 250
Connecting The Ground
Consult with local electrical and safety codes for proper
connection based on condition of use. Refer to the
Conductor Grounding Table, Article 250 of the NEC
handbook.
NOTICE
Trailer-mounted generators are the sole responsibility
of MQ Power.
GENERATOR GROUNDING
ALWAYS refer to Article 250 (Grounding and Bonding) of
the National Electrical Code (NEC).
EXAMPLE of how to ground the unit (Figure 3) if the
condition of use requires such a device:
NOTICE
ALWAYS check with state, province, district, and
municipalities for electrical grounding requirements
before using the generator.

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 15
INSTALLATION
OUTDOOR INSTALLATION
Install the generator in an area that is free of debris,
bystanders, and overhead obstructions. Make sure the
generator is on secure, level ground so that it cannot slide
or shift around. Also, install the generator in a manner so
that the exhaust will not be discharged in the direction of
nearby homes.
The installation site must be relatively free from moisture
and dust. All electrical equipment should be protected
from excessive moisture. Failure to do so will result in
deterioration of the insulation and will result in short circuits
and grounding.
Foreign materials such as dust, sand, lint, and abrasive
materials have a tendency to cause excessive wear to
engine and alternator parts.
INDOOR INSTALLATION
Exhaust gases from diesel engines are extremely
poisonous. Whenever an engine is installed indoors the
exhaust fumes must be vented to the outside. The engine
should be installed at least two feet from any outside wall.
Using an exhaust pipe which is too long or too small can
cause excessive back pressure which will cause the engine
to heat excessively and possibly burn the valves.
CAUTION
Pay close attention to ventilation when operating the
generator inside tunnels and caves.The engine exhaust
contains noxious elements. Engine exhaust must be
routed to a ventilated area.
MOUNTING
The generator must be mounted on a solid foundation
(such as concrete) and set firmly on the foundation to
isolate vibration of the generator when it is running. The
generator must be mounted at least 6 inches above the floor
or grade level as referenced in the National Fire Protection
Association handbook (NFPA 110, Chapter 7, Section 7.4).
DO NOT remove the metal skids on the bottom of the
generator. They are to resist damage to the bottom of the
generator and to maintain alignment.

PAGE 16 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
GENERATOR
This generator (Figure 4) is designed as a high-quality,
portable (requiring a trailer for transport) power source for
telecom sites, lighting facilities, power tools, submersible
pumps, and other industrial and construction machinery.
CONTROL AND OPERATION PANEL
The control and operation panel is provided with the
following:
Engine Warning Lamp Unit Assembly
• Pre-Heat Lamp
• Oil Pressure Alarm Lamp
• Water Temperature Alarm Lamp
• Battery Charging Alarm Lamp
Engine Speed Switch
Frequency Meter (Hz)
AC Ammeter (A)
AC Voltmeter (V)
Voltage Regulator
Ignition/Starter Switch
Hour Meter
3-Pole, 45-Amp Main Circuit Breaker
1-Pole, 20-Amp Breaker (for GFCI receptacle)
1-Pole, 30-Amp Breaker (for L5-30R receptacle)
2-Pole, 30-Amp Breaker (for L6-30R receptacle)
2-Pole, 50-Amp Breaker (for CS6369 receptacle)
Control Box (located behind control panel)
• Automatic Voltage Regulator
• Current Transformer
• Voltage Rectifer
• Starter Relay
OUTPUT RECEPTACLE PANEL
The output receptacle panel is provided with the following:
120V Output Receptacle (GFCI)
120V Output Receptacle (L5-30R)
240V Output Receptacle (L6-30R)
240/120V Output Receptacle (CS6369)
GFCI Ground Terminal
Enclosure Ground Terminal
Battery Charger (Option)
Engine Block Heater (Option)
Emergency Stop Switch (Option)
OPEN-DELTA EXCITATION SYSTEM
Each generator is equipped with a 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 the demands of the required load.
ENGINE
This generator is powered by a 3-cylinder, 4-cycle,
water-cooled, swirl combustion chamber type Kubota
D1503-M diesel engine. This engine is designed to meet
every performance requirement for the generator. Refer to
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
A microprocessor controls the RPM of the engine. When the
engine demand increases or decreases, the microprocessor
system regulates the frequency variation to ± 0.25%.
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

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 17
MAJOR COMPONENTS
1
10
2
67
83
4
5
9
10
Figure 4. Major Components
Table 4. Major Components
ITEM NO. DESCRIPTION
1Fuel Tank Assembly
2 Muffler Assembly
3 Coolant Drain Assembly
4 Oil Drain Assembly
5 Fuel Drain Assembly
6 Engine and Radiator Assembly
7 Generator Assembly
8 Battery Assembly
9 Control and Operation Panel Assembly
10 Output Receptacle Panel Assembly

PAGE 18 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
The definitions below describe the controls and functions
of the control and operation panel (Figure 5).
1. Frequency Meter — Indicates the output frequency
in hertz (Hz). Normally 60 Hz.
2. AC Ammeter — Indicates the amount of current
flowing to the load connected to the output receptacles.
3. AC Voltmeter — Indicates the phase-to-phase voltage
of the output receptacles.
4. Engine Warning Lamp Module — This module
displays the following engine alarms: oil pressure, water
temperature, battery charging and pre-heat.
A. Oil Pressure Alarm Lamp — During normal
operation of the generator this lamp
will remain OFF. When the ignition
switch is placed in the RUN position
to start the engine, the lamp will be
ON. When the oil pressure rises
after start-up the lamp will go OFF.
If this lamp is ever lit (ON) during normal operation
of the generator, the emergency shutdown system
will stop the engine automatically.
Figure 5. Control And Operation Panel
B. Water Temperature Alarm Lamp — This lamp
turns ON when the cooling water
temperature rises abnormally. If
the lamp turns ON during normal
operation of the generator, the
emergency shutdown system will
stop the engine automatically.
C. Battery Charge Alarm Lamp — This lamp is ON
when the output voltage of the
alternator drops below a set value.
If this lamp is ON during normal
operation, the emergency
shutdown system will immediately
stop the engine.
D. Preheat Lamp — The preheat lamp will turn ON
when the Starter switch is placed in the Preheat
position.When the preheat cycle is
completed the lamp will turn OFF
and the engine can be started. In
addition this lamp displays engine
faults via flashes (blinking). See
engine trouble codes in the
Troubleshooting section of this
manual.
CONTROL AND OPERATION PANEL

DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22) — PAGE 19
CONTROL AND OPERATION PANEL
5. Engine Speed Switch — Controls the speed of the
engine (low or high).
6. Hour Meter — Indicates the amount of time the
generator has been in use.
7. Ignition/Starter Switch — Four-position switch: Stop,
Run, Preheat, and Start. Insert the ignition key to start
and stop engine.
8. Voltage Regulator Control Knob — Allows manual
adjustment of the generator’s output voltage.
9. Circuit Breaker — Two-pole, 50-amp breaker protects
the CS6369 receptacle.
10. Circuit Breaker — Two-pole, 30-amp breaker protects
the L6-30R receptacle.
11. Circuit Breaker — Single-pole, 30-amp breaker
protects the L5-30R receptacle.
12. Circuit Breaker — Single-pole, 20-amp breaker
protects the GFCI receptacle.
13. Main Circuit Breaker — Three-pole, 45-amp main
circuit breaker connects or disconnects the generator
output from the output receptacles and protects the
generator from short circuits or overcurrent.

PAGE 20 — DCA10SPX4/DCA10SPXU4 • OPERATION MANUAL — REV. #2 (10/11/22)
OUTPUT RECEPTACLE PANEL FAMILIARIZATION
OUTPUT RECEPTACLE PANEL
The output receptacle panel (Figure 6) shown below is
provided for the connection of electrical loads.
Figure 6. Output Receptacle Panel
OUTPUT RECEPTACLE FAMILIARIZATION
The output receptacle panel (Figure 6) is provided with
the following:
One (1) 240/120-volt, 50-amp, CS6369 output receptacle
One (1) 240-volt, 30-amp, L6-30R output receptacle
One (1) 120-volt, 30-amp, L5-30R output receptacle
One (1) 120-volt, 20-amp, GFCI output receptacle
One (1) GFCI ground terminal