MULTIQUIP MQ Power Whisperwatt DCA220SSCU Guide

THIS MANUAL MUST ACCOMPANY THE EQUIPMENT AT ALL TIMES.
To find the latest revision of this
publication, visit our website at:
www.mqpower.com
®
WHISPERWATT™ SERIES
MODEL DCA220SSCU
MODEL DCA220SSCU4i
60Hz GENERATOR
(CUMMINS QSB7-G6 DIESEL ENGINE)
PARTS LIST NO. M4870300204
Revision #0 (10/25/12)
OPERATION AND PARTS MANUAL

PAGE 2 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
PROPOSITION 65 WARNING
Diesel engine exhaust and some of

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 3
If you believe that your vehicle has a defect that could cause a crash or could cause
injury or death, you should immediately inform the National Highway Traffic Safety
Administration (NHTSA) in addition to notifying Multiquip at 1-800-421-1244.
If NHTSA receives similar complaints, it may open an investigation, and if it finds
that a safety defect exists in a group of vehicles, it may order a recall and remedy
campaign. However, NHTSA cannot become involved in individual problems
between you, your dealer, or Multiquip.
To contact NHTSA, you may either call the Vehicle Safety Hotline toll-free at 1-888-
327-4236 (TTY: 1-800-424-9153), go to http://www.nhtsa.dot.gov; or write to:
Administrator
NHTSA
1200 New Jersey Avenue S.E.
Washington, DC 20590
You can also obtain information about motor vehicle safety from
http://www.safecar.gov.
REPORTING SAFETY DEFECTS

PAGE 4 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
TABLE OF CONTENTS
DCA220SSCU/SSCU4i
Proposition 65 Warning ........................................... 2
Reporting Safety Defects ......................................... 3
Table Of Contents .................................................... 4
Safety Information .............................................. 6-11
Specifications ........................................................ 12
Dimensions ............................................................ 13
Installation ........................................................ 14-15
General Information ............................................... 16
Major Components ................................................ 17
Engine Control Unit (ECU) .................................... 18
Engine/Generator Control Panel............................ 19
Output Terminal Panel Familiarization .............. 20-22
Load Application .................................................... 23
Generator Outputs ................................................. 24
Generator Outputs/Gauge Reading ....................... 25
Output Terminal Panel Connections ................. 26-27
Inspection/Setup ............................................... 28-31
Generator Start-Up Procedure (Manual) .......... 32-33
Generator Start-Up Procedure (Auto Mode) .......... 34
Generator Shut-Down Procedures ........................ 35
Maintenance ..................................................... 36-41
Trailer Maintenance .......................................... 42-45
TTrailer Wiring Diagram ......................................... 46
Generator Wiring Diagram ..................................... 47
Engine Wiring Diagram .......................................... 48
Troubleshooting (Generator) .................................. 49
Troubleshooting Diagnostics ................................. 50
Explanation of Code in Remarks Column.............. 52
Suggested Spare Parts ......................................... 53
Component Drawings
Generator Assembly ......................................... 54-57
Control Panel Assembly ................................... 58-59
Control Box Assembly ...................................... 60-63
Engine And Radiator Assembly ........................ 64-65
Output Terminal Assembly ................................ 66-67
Battery Assembly.............................................. 68-69
Muffler Assembly .............................................. 70-71
Fuel Tank Assembly .......................................... 72-73
Enclosure Assembly ......................................... 74-79
Rubber Seals Assembly ................................. 80-81
Nameplate And Decals Assembly .................... 82-85
Terms And Conditions Of Sale — Parts ................ 86
NOTICE
Specifications are subject to change without notice.

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 5
NOTES

PAGE 6 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
SAFETY INFORMATION
Do not operate or service the equipment before reading the
entire manual. Safety precautions should be followed at all
times when operating this equipment. 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 specifi cally 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
equipment will be referenced with hazard symbols which
may appear throughout this manual in conjunction with
safety messages.

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 7
SAFETY INFORMATION
GENERAL SAFETY
CAUTION
NEVER operate this equipment 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 equipment when not
feeling well due to fatigue, illness or when
under medication.

NEVER operate this equipment under the infl uence of
drugs or alcohol.

ALWAYS check the equipment for loosened threads or
bolts before starting.

DO NOT use the equipment for any purpose other than
its intended purposes or applications.
NOTICE

This equipment should only be operated by trained and
qualifi ed personnel 18 years of age and older.

Whenever necessary, replace nameplate, operation and
safety decals when they become diffi cult read.

Manufacturer does not assume responsibility for any
accident due to equipment modifi cations. Unauthorized
equipment modifi cation will void all warranties.
NEVER use accessories or attachments that are not
recommended by MQ Power for this equipment. Damage
to the equipment and/or injury to user may result.
ALWAYS know the location of the nearest
fi re extinguisher.
ALWAYS know the location of the nearest
fi rst 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
fi re department.
This information will be invaluable in
the case of an emergency.
GENERATOR SAFETY
DANGER
NEVER operate the equipment in an explosive
atmosphere or near combustible materials. An
explosion or fi re 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 machine.
NOTICE
ALWAYS
ensure generator is on level ground before use.
ALWAYS
keep the machine in proper running condition.
Fix damage to machine and replace any broken parts
immediately.
ALWAYS
store equipment properly when it is not being
used. Equipment should be stored in a clean, dry location
out of the reach of children and unauthorized personnel

PAGE 8 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
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 equipment
requires an adequate free
fl ow of cooling air. NEVER
operate this equipment in
any enclosed or narrow area
where free fl ow of the air is
restricted. If the air fl ow is
restricted it will cause injury to people and property and
serious damage to the equipment or engine.
WARNING
DO NOT place hands or fingers inside engine
compartment when engine is running.
NEVER operate the engine with heat shields or
guards removed.

Keep fi ngers, hands hair and clothing away
from all moving parts to prevent injury.

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 remove the engine oil drain plug while the
engine is hot. Hot oil will gush out of the oil tank and
severely scald any persons in the general area of the
generator.
CAUTION

NEVER touch the hot exhaust manifold,
muffl er or cylinder. Allow these parts to cool
before servicing equipment.
NOTICE
NEVER
run engine without an air fi lter or with a dirty air
fi lter. Severe engine damage may occur. Service air fi lter
frequently to prevent engine malfunction.
NEVER tamper with the factory settings
of the engine or engine governor. Damage
to the engine or equipment 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
suffi cient load (less than 40% 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 effi ciency,
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.
State Health Safety Codes and Public Resources
Codes specify that in certain locations, spark arresters
must be used on internal combustion engines that use
hydrocarbon fuels. A spark arrester is a device designed
to prevent accidental discharge of sparks or fl ames
from the engine exhaust. Spark arresters are qualifi ed
and rated by the United States Forest Service for this
purpose. In order to comply with local laws regarding
spark arresters, consult the engine distributor or the
local Health and Safety Administrator.

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 9
SAFETY INFORMATION
FUEL SAFETY
DANGER
DO NOT start the engine near spilled fuel or combustible
fl uids. Diesel fuel is extremely fl ammable and its vapors
can cause an explosion if ignited.
ALWAYS refuel in a well-ventilated area, away from
sparks and open fl ames.
ALWAYS use extreme caution when working with
fl ammable liquids.
DO NOT fi ll the fuel tank while the engine is running
or hot.
DO NOT overfi ll tank, since spilled fuel could 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 fl ames.
NEVER use fuel as a cleaning agent.
DO NOT 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)
Safety Towing Regulations, before towing
your generator.
Refer to 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 the trailer that supports the generator and
the towing vehicle are mechanically sound and in good
operating condition.
 ALWAYS shutdown 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 towing vehicle and
trailer.
Trailer tires should be infl ated to 50 psi cold.
Also check the tire tread wear on both vehicles.
ALWAYS make sure the trailer is equipped with a
safety
chain.
ALWAYS properly
attach trailer’s safety chains to 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 type of terrain.

Avoid sudden stops and starts. This can cause skidding,
or jack-knifi ng. Smooth, gradual starts and stops will
improve towing.
Avoid sharp turns to prevent rolling.

Trailer should be adjusted to a level position at all times
when towing.
Raise and lock trailer wheel stand in up position when
towing.
Place chock blocks underneath wheel 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.

PAGE 10 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
SAFETY INFORMATION
ELECTRICAL SAFETY
DANGER

DO NOT touch output terminals during
operation. Contact with 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 generator and all circuit breakers OFF
before performing maintenance on the generator or
making contact with 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 generator. Inspect for cuts in
the insulation.

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 proper power or extension
cord has been selected for the job. See 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 generator.
Severe injury or death by
electrocution
can result from operating an ungrounded
generator.
NEVER use gas piping as an electrical ground.

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 11
SAFETY INFORMATION
BATTERY SAFETY
DANGER
DO NOT drop the battery. There is a possibility that the
battery will explode.
DO NOT expose the battery to open fl ames,
sparks, cigarettes, etc. The battery contains
combustible gases and liquids. If these
gases and liquids come into contact with a
fl ame 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 gasses.
If the battery liquid (dilute sulfuric acid) comes into
contact with clothing or skin, rinse skin or clothing
immediately with plenty of water.
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
NOTICE
Dispose of hazardous waste properly.
Examples of potentially hazardous waste
are used motor oil, fuel and fuel fi lters.
DO NOT use food or plastic containers to
dispose of hazardous waste.
DO NOT
pour waste, oil or fuel directly onto the ground,
down a drain or into any water source.

PAGE 12 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
SPECIFICATIONS
Table 1. Generator Specifications
Model DCA220SSCU/ DCA220SSCU4i
Type Revolving field, self ventilated,
open protected type synchronous generator
Armature Connection Star with Neutral
Phase 3
Standby Output 194 kW (242 kVA)
Prime Output 176 kW (220 kVA)
3Ø Voltage (L-L/L-N)
Voltage Change-Over Bd. at 3Ø 240/139 208Y/120, 220Y/127, 240Y/139
3Ø Voltage (L-L/L-N)
Voltage Change-Over Bd. at 3Ø 480/277 416Y/240, 440Y/254, 480Y/277
1Ø Voltage (L-L/L-N)
Voltage Change-Over Bd. at 1Ø 240/120 240/120
Power Factor 0.8
Frequency 60 Hz
Speed 1800 rpm
Aux. AC Power Single Phase, 60 Hz
Aux. Voltage/Output 4.8 Kw (2.4 kW x 2)
Dry Weight 6,636 lbs. (3,010 kg)
Wet Weight 7,496 lbs. (3,400 kg)
Table 2. Engine Specifications
Model Cummins QSB7-G6 EPA Interim Tier 4 Certified
Type 4 cycle, water-cooled, direct injection, turbo-charged
air cooled and EGR
No. of Cylinders 6 cylinders
Bore x Stroke 4.21 in. x 4.88 in. (107 mm x 124 mm)
Displacement 409 cu. in. (6.7 liter)
Rated Output 282 HP at 1800 rpm
Starting Electric
Coolant Capacity 11.4 gal. (43.0 liters)1
Lube Oil Capacity 4.6 gal. (17.5 liters)2
Lubricating Type Oil API service class CJ-4 SAE 15W-40
Fuel Type #2 Diesel Fuel (Ultra low sulfur diesel fuel only)
Fuel Tank Capacity 100 gal. (380 liters)
Fuel Consumption 12.4 gal. (46.8 L)/hr at full load 9.5 gal. (36.0 L)/hr at 3/4 load
6.9 gal. (26.0 L)/hr at 1/2 load 4.4 gal. (16.8 L)/hr at 1/4 load
Battery 27 (CCA 0°F 800A) X 2
1 Includes engine and radiator hoses
2 Includes filters

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 13
DIMENSIONS
SIDE VIEW
TOP VIEW
FRONT VIEW
G
H
F
A E
BC
D
MAXIMUM
LIFTING
POINT
14,050 lbs.
(6,373 kg)
220
Table 3. Dimensions
Reference
Letter Dimension in. (mm) Reference Letter Dimension in. (mm)
A 31.10 in. (790 mm) E 41.33 in. (1,050 mm.)
B 31.10 in. (790 mm) F 137.79 in. (3,500 mm)
C 41.33 in. (1,050 mm) G 68.89 in. (1,750 mm)
D 41.33 in. (1,050 mm) H 51.18 in. (1,300 mm)
Figure 1. Dimensions

PAGE 14 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
INSTALLATION
Figure 2. Typical Generator Grounding Application

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 15
INSTALLATION
OUTDOOR INSTALLATION
Install the generator in a 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 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.
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 set at least 6 inches above the floor or grade level (in
accordance to NFPA 110, Chapter 5-4.1). 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.
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.
GENERATOR GROUNDING
To guard against electrical shock and possible damage to
the equipment, it is important to provide a good EARTH
ground (Figure 2).
Article 250 (Grounding) of the National Electrical Code
(NEC) provides guide lines for proper grounding and
specifies that the cable ground shall be connected to the
grounding system of the building as close to the point of
cable entry as practical.
NEC articles 250-64(b) and 250-66 set the following
grounding requirements:
1. Use one of the following wire types to connect the
generator to earth ground.
a. Copper - 8 AWG (5.3 mm2)
b. Aluminum - 6 AWG (8.4 mm2)
2. When grounding the generator (Figure 2) connect the
ground cable between the lock washer and the nut on
the generator and tighten the nut fully. Connect the
other end of the ground cable to earth ground.
3. NEC article 250-52(c) specifies that the earth ground rod
should be buried a minimum of 8 ft. into the ground.
NOTICE
When connecting the generator to any buildings
electrical system ALWAYS consult with a licensed
electrician.
NOTICE
This generator has a permanent bonding conductor
between the generator stator windings and the frame.

PAGE 16 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
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
Gauge Unit Assembly
• Oil Pressure Gauge
• Water Temperature Gauge
• Charging Voltmeter
• Fuel Gauge
• Tachometer
Panel Light/Panel Light Switch
Hour Check Button
Auto Start/Stop Switch
Engine Speed Switch
Emergency Stop Button
Water Temperature Gauge
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, 600 amp Main Circuit Breaker
“Control Box” (located behind Control Panel)
• Automatic Voltage Regulator
• Current Transformer
• Over-Current 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
Eight output terminal lugs (3Ø power)
Ground lug
Battery Charger (Optional)
Jacket Water Heater (Optional)
OPEN DELTA EXCITATION SYSTEM
Each 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 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 6 cylinder, 4-cycle water
cooled, direct injection, turbocharged, air cooled Cummins
QSB7-G6 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%.
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

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 17
MAJOR COMPONENTS
220
220
UVWOGND
Denyo
OFF
W
U
V
OFF
W-U
V-W
U-V
DECREASE
INCREASE
PSI
OILPRESS
0
25 50 75
100 °F
WATERTEMP
100
140 180 220
260 VOLTS
BATTERY
6
12 18 24
30
FUEL
E
½
FRPMX10
SPEED
0
120 150 180
210
60
Engine Started
Shutdown
Pre-Alarm
Series 800 Controller
Alarm
Acknowledge
Screen
Change
Program/
Exit
Option
ECU
12
3
4
56
7
8
11
9
10
Table 4. Generator Major Components
ITEM NO. DESCRIPTION
1 Muffler Assembly
2 Enclosure Assembly
3 Generator Assembly
4 Battery Assembly
5 Engine Assembly
6 Fuel Tank Assembly
7 Output Terminal Assembly
8 Circuit Breaker Assembly
9 Auto Start/Stop Controller Assembly
10 Gauge Unit Assembly
11 Operating Panel Assembly
Figure 3. Major Components

PAGE 18 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
ENGINE CONTROL UNIT (ECU)
Figure 4. Engine Control Unit (ECU)
PSI
OIL PRESS
0
25 50 75
100 °F
WATERTEMP
100
140 180 220
260 VOLTS
BATTERY
6
12 18 24
30
°F
FUEL
E
½
FRPMX10
SPEED
0
120 150 180
210
60
Series 800 Controller
ECU
Engine Started
Shutdown
Pre-Alarm
Alarm
Acknowledge
Screen
Change
Program
Exit
Option
OFF
U-V W-U
V-W
OFF
V
W
U
INCREASE DECREASE
Series 800 Controller
ECU
Engine Started
Shutdown
Pre-Alarm
Alarm
Acknowledge
Screen
Change
Program
Exit
Option
A
B
C
D
E F GH
1
The definitions below describe the controls and functions
of the Engine Control Unit (Figure 4).
1. ECU Controller — This auto start/stop controller
displays the parameters and the diagnostic
troubleshooting messages of the engine, and controls
DPF regeneration.
A. ECU Display Screen — Engine fault diagnostic
messages are shown on this LCD display. screen
B. Engine Started Lamp — This lamp when lit
indicates engine is operating normally.
C. Engine Shutdown Lamp — When an engine
failure has occured this lamp will blink. Indicating
the engine has been shutdown. The diagnostic
fault message will be displayed on the LCD screen.
D. Pre Alarm Lamp — When an engine failure has
occured this lamp will blink. Indicating a pre-fault
engine condition and the possibility of engine
shutdown.The diagnostic fault message will be
displayed on the LCD screen
E. Alarm Acknowledge Button — When the engine
experiences a fault, the "Pre Alarm Lamp" or the
"Shutdown Lamp" will start blinking. Pushing this
button will confirm the fault message and the
blinking lamp will change to a solid lamp display.
The fault message will be displayed on the screen.
When multiple engine faults occur, the lamp will
continue blnking until all fault messages are
confirmed. The blinking lamp will change to a solid
lamp display all current confirmed fault messages
will scrool across the screen.
F. Screen Change Button — When this button is
pushed during operation, the screen will cycle
through each parameter screen.
G. Option Button — This button is not active. Do
not use.
H. Program/Exit Button — Pushing this button
allows the DPF Force Regen and diagnostic code
to be confirmed.

DCA220SSCU/4i 60 HZ GENERATOR• OPERATION MANUAL — REV. #0 (10/25/12) — PAGE 19
ENGINE/GENERATOR CONTROL PANEL
The definitions below describe the controls and functions
of the Engine/Generator Control Panel (Figure 5).
1. Gauge Unit Assembly — This assembly houses
the various engine monitoring gauges. These gauges
indicate: oil pressure, water temperature, charging
voltmeter, fuel and engine speed RPM (tachometer).
A. Oil Pressure Gauge — During normal operation
this gauge be should read between 35 to 65 psi.
(241~448 kPa). When starting the generator the
oil pressure may read a little higher, but after the
engine warms up the oil pressure should return to
the correct pressure range.
B. Water Temperature Gauge — During normal
operation this gauge be should read between 180°
and 225°F (82°~107°C).
C. Charging Voltmeter Gauge — During normal
operation this gauge indicate minimum 26 VDC
D. Fuel Gauge — Indicates amount of diesel fuel
available.
E. Tachometer — Indicates engine speed in RPM’s
for 60 Hz operation. This meter should indicate
1800 RPM’s when the rated load is applied. .
2. Panel Light — For operation at night, panel light
illuminates control panel for ease of reading meters
and gauges. Make sure oanel light switch is in the OFF
position when light is not in use.
3. Panel Light Switch — When activated will turn on
control panel light.
4. Frequency Meter — Indicates the output frequency
in hertz (Hz). Normally 60 Hz
PSI
OIL PRESS
0
25 50 75
100 °F
WATER TEMP
100
140 180 220
260 VOLTS
BATTERY
6
12 18 24
30
°F
FUEL
E
½
FRPMX10
SPEED
0
120 150 180
210
60
D
AB C
E
1
PSI
OIL PRESS
0
25 50 75
100 °F
WATERTEMP
100
140 180 220
260 VOLTS
BATTERY
6
12 18 24
30
°F
FUEL
E
½
FRPMX10
SPEED
0
120 150 180
210
60
Series 800 Controller
ECU
Engine Started
Shutdown
Pre-Alarm
Alarm
Acknowledge
Screen
Change
Program
Exit
Option
OFF
U-V W-U
V-W
OFF
V
W
U
INCREASE DECREASE
7
4
5
6
8
9
10
11
13 12
23
14
Figure 5. Gauge Unit Assembly
5. AC Ammeter — Indicates the amount of current the
load is drawing from the generator per leg selected by
the ammeter phase-selector switch.
6. AC Voltmeter — Indicates the output voltage present
at the U,V, and W Output Terminal Lugs.
7. Voltage Regulator Control — Allows ±15% manual
adjustment of the generator’s output voltage.
8. Ammeter Change-Over Switch — This switch allows
the AC ammeter to indicate the current flowing to the load
connected to any phase of the output terminals, or to be
switched off. This switch does not effect the generator
output in any fashion, it is for current reading only.
9. Voltmeter Change-Over Switch — This switch allows
the AC voltmeter to indicate phase to phase voltage
between any two phases of the output terminals or to
be switched off.
10. Emergency Stop Button — Push this button inward
to stop the engine in the event of an emergency. DO
NOT use this button as a means of stopping the engine.
11. Engine Speed Switch — This switch controls the
speed of the engine (low/high).
12. Auto/Start Switch — This switch selects either manual
or automatic operation . Center position is OFF (reset).
13. Hour Check Button — With the engine stopped, press
and hold ths button. The total running hours, fuel level,
and battery voltage will be displayed.
14. Main Circuit Breaker — This three-pole, 600 amp
main breaker is provided to protect the U,V, and W
Output Terminal Lugs from overload.

PAGE 20 — DCA220SSCU/4i 60 HZ GENERATOR • OPERATION AND PARTS MANUAL — REV. #0 (10/25/12)
OUTPUT TERMINAL PANEL FAMILIARIZATION
OUTPUT TERMINAL PANEL
The Output Terminal Panel (Figure 7) shown below is
located on the right-hand side (left from control panel) of
the generator. Lift up on the cover to gain access to
receptacles and terminal lugs.
NOTICE
Terminal legs “O” and “Ground” are considered bonded
grounds
OUTPUT TERMINAL FAMILIARIZATION
The “Output Terminal Panel ” (Figure 7) is provided with
the following:
Three (3) 240/139V output receptacles @ 50 amp
Three (3) Circuit Breakers @ 50 amps
Two (2) 120V GFCI receptacles @ 20 amp
Two (2) GFCI Circuit Breakers @ 20 amps
Eight (8) Output Terminal Lugs ( U, V, W, O, Ground)
AUX. POWER RECEPTACLES
240/139V, 50 AMPS
120 VAC, 20 AMP
GFCI RECEPTACLES
Y
X
W
CS-6369
TWIST-LOCK
CIRCUIT BREAKERS
FOR CS-6369 TWIST
LOCK RECEPTACLES
CIRCUIT BREAKERS
FOR GFCI RECEPTACLES
O
UVW
1Ø AND 3Ø,
480 -120 VAC
OUTPUT TERMINALS
NEUTRAL
TERMINAL GROUND
TERMINAL
HARD WIRE
HOOKUP PANEL
BLACK RED BLUE WHITE GREEN
Figure 6. Output Terminal Panel