Generac Power Systems MGG155, MGG210 Operating Manual

GASEOUS GENERATOR

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MGG155 • MGG210

OPERATING MANUAL

00620

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35319 C 05/16

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WARNING

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CALIFORNIA PROPOSITION 65 WARNING: Engine exhaust and some of its constituents
are known to the state of California to cause cancer, birth defects, and other reproduc-

tive harm. (000004)

WARNING

CALIFORNIA PROPOSITION 65 WARNING: This product contains or emits chemicals

known to the state of California to cause cancer, birth defects, and other reproductive

harm. (000005)

WARNING

ENVIRONMENTAL HAZARD: Always recycle batteries at an official recycling center in
accordance with all local law and regulations. Failure to do so could result in environ-

mental damage, death or serious injury. (000228)

ii

Introduction

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This manual provides information and procedures to safely operate and maintain the Generac Mobile Products unit.
For your own safety and protection from physical injury, carefully read, understand, and observe the safety instructions
described in this manual. Keep a copy of this manual with the unit at all times. Additional copies are available from
Generac Mobile Products. The information contained in this manual was based on machines in production at the

time of publication. Generac Mobile Products reserves the right to change any portion of this information without
notice.

Read all of the manuals included with the unit. Each manual details specific information regarding items such as
setup, use and service requirements. An engine operator’s manual provides detailed operation and maintenance
procedures for the engine. Additional copies of the engine operator’s manual are available from the engine
manufacturer.

DO NOT MODIFY or use this equipment for any application other than for which it was designed.

Only a trained and licensed electrician should perform wiring and connections to unit. Wiring must be in compliance
with National Electrical Code (NEC), state and local regulations, and Occupational Safety and Health Administration

(OSHA) guidelines.

Engine Make:__________________________________________
Engine Serial Number:___________________________________
Engine Model Number: __________________________________
Generator Make: _______________________________________
Generator Model Number: ________________________________
Generator Serial Number: ________________________________
Unit Model Number:_____________________________________
Unit Serial Number: _____________________________________
Dealer Name:__________________________________________
Dealer Phone Number: __________________________________

iii

Table of Contents

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Section 1 - Safety

Safety Notes ....................................................................................................................................... 1

Operating Safety................................................................................................................................. 1

Engine Safety ..................................................................................................................................... 2

Service Safety .................................................................................................................................... 2

Towing Safety.....................................................................................................................................3

Reporting Trailer Safety Defects ........................................................................................................ 3

Section 2 - General Information

Specifications ..................................................................................................................................... 5

Unit Dimensions .................................................................................................................... 6

Engine Oil Recommendations ............................................................................................... 6

Coolant Recommendation ..................................................................................................... 7

Unit Serial Number Locations.............................................................................................................7

Component Locations......................................................................................................................... 8

Unit Set Up ....................................................................................................................................... 14

Well Site Approval ............................................................................................................... 14

Fuel Connections................................................................................................................. 14

LP Liquid Connections (Liquid Withdrawal System)............................................................ 17

Valve and Fitting Pipe Equivalents ...................................................................................... 19

Electrical Connections ......................................................................................................... 19

Dual Fuel System ............................................................................................................................. 20

Natural Gas (Well Gas) Fuel System .................................................................................. 20

LP Liquid Withdrawal Fuel System...................................................................................... 20

DC Fuses.......................................................................................................................................... 20

Generator and Load Compatibility....................................................................................................20

Engine/Generator Protective Devices .............................................................................................. 21

Digital Controller ............................................................................................................................... 21

Setting the Clock ................................................................................................................. 22

Section 3 - Operation

Prestart Checklist ............................................................................................................................. 23

Manually Starting the Unit ................................................................................................................ 23

Natural Gas (Well Gas) Start Up .........................................................................................23

LP Liquid Start Up ............................................................................................................... 24

Auto (Remote) Starting the Unit ....................................................................................................... 24

Parallel Setup and Operation ........................................................................................................... 24

Operation Checks.............................................................................................................................25

Overcrank Shutdown ........................................................................................................................ 25

Derating for Altitude..........................................................................................................................26

Generator Output Connections......................................................................................................... 26

Customer Convenience Receptacles ............................................................................................... 27

Main Circuit Breaker ......................................................................................................................... 28

Frame Ground Connection .................................................................................................. 28

Battery Disconnect Switch................................................................................................... 28

Shutting Down the Unit.....................................................................................................................28

Emergency Stop Switch ................................................................................................................... 29

Towing the Trailer.............................................................................................................................29

Section 4 - Maintenance

Emissions ......................................................................................................................................... 31

Maintenance Tasks .......................................................................................................................... 31

Daily Walk Around Inspection.............................................................................................. 31

Check Fuel System ............................................................................................................. 31

Check Engine Fluids............................................................................................................ 31

Changing the Oil.................................................................................................................. 32

v

Adding Coolant .................................................................................................................... 33

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Integrated Electronic Pressure Regulator (IEPR) Maintenance and Inspection.................. 33

Checking/Draining Oil Build-Up in the Vaporizer Regulator ................................................34

Maintenance Schedule ..................................................................................................................... 34

Battery Inspection................................................................................................................ 36

Battery Replacement ........................................................................................................... 37

Other Maintenance Checks ................................................................................................. 38

Jack Maintenance............................................................................................................................. 39

Side-Wind Models ............................................................................................................... 39

Top-Wind Models ................................................................................................................ 39

Trailer Wheel Bearings ..................................................................................................................... 39

Section 5 - Troubleshooting

Problems and Solutions....................................................................................................... 41

Section 6 - Wiring Diagrams

AC Wiring - MGG155 (120V GCB) ...................................................................................................53

AC Wiring - MGG210 (120V GCB) ...................................................................................................54

AC Wiring - MGG155 (24V GCB) ..................................................................................................... 55

AC Wiring - MGG210 (24V GCB) ..................................................................................................... 56

DC Wiring - MGG155 (120V GCB)...................................................................................................57

DC Wiring - MGG210 (120V GCB)...................................................................................................58

DC Wiring - MGG155 (24V GCB).....................................................................................................59

DC Wiring - MGG210 (24V GCB).....................................................................................................60

CAN Parallel Communication Connection - MGG155 and MGG210 ............................................... 61

vi

SAFETY NOTES

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This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety
messages that follow this symbol to avoid possible injury or death.

This manual contains DANGERS, WARNINGS, CAUTIONS, NOTICES and NOTES which must be
followed to prevent the possibility of improper service, damage to the equipment, personal injury or death.
The following formatting options will apply when calling the readers attention to the DANGERS, WARN­INGS, CAUTIONS, NOTICES and NOTES.

INDICATES A HAZARDOUS SITUATION WHICH, IF NOT AVOIDED, WILL RESULT IN

Indicates a hazardous situation which, if not avoided, could result in death or serious

Indicates a hazardous situation which, if not avoided, could result in minor or moderate

Section 1 - Safety

DANGER

DEATH OR SERIOUS INJURY. (000001)

WARNING

injury. (000002)

CAUTION

injury. (000003)

Indicates a hazardous situation which, if not avoided, could result in property or equipment

damage.

Note: Notes contain additional information important to a procedure and will be found within the regular text body
of this manual.

OPERATING SAFETY

Before using the unit, be sure you read and understand all of the instructions. This equipment was
designed for specific applications; DO NOT modify or use this equipment for any application other than
which it was designed for. Equipment operated improperly or by untrained personnel can be dangerous.
Read the operating instructions and familiarize yourself with the location and proper use of all instruments
and controls. Inexperienced operators should receive instruction from someone familiar with the equipment
before being allowed to operate or set up the unit. The following points should be practiced at all times:

• The area immediately surrounding the unit should be dry, clean, and free of debris.

• Position and operate the unit on a firm, level surface.

• DO NOT start a unit in need of repair.

• If the unit is equipped with a frame grounding stud, follow any local, state, and National Electrical
Code (NEC) guidelines when connecting.

• DO NOT operate the unit on a combustible surface.

• DO NOT operate a unit while tired, distracted, or under the influence of drugs or alcohol.

• Keep all body parts, clothing and other loose items away from moving parts.

• All fuel types are potentially FLAMMABLE and/or EXPLOSIVE and should be handled with care.
Comply with all laws regulating the storage and handling of fuels. Inspect the unit’s fuel system
frequently and correct any leaks immediately. Fuel supply lines must be properly installed, purged,
and leak tested according to applicable fuel-gas codes before placing the equipment into service.

35319 C MGG155/210 Operating Manual 1

Safety

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• DO NOT smoke around the unit.

• Shut the engine down if any of the following conditions exist during operation:

1. Noticeable change in engine speed.

2. Loss of electrical output.

3. Equipment connected to the unit overheats.

4. Sparking occurs.

5. Engine misfires or there is excessive engine/generator vibration.

6. Protective covers are loose or missing.

7. If the ambient air temperature is above 120°F (49°C).

ENGINE SAFETY

Internal combustion engines present special hazards during operation and fueling. Failure to follow the
safety guidelines described below could result in severe injury or death. Read and follow all safety warnings
described in the engine operator's manual. A copy of this manual was supplied with the unit when it was
shipped from the factory.

• DO NOT run engine indoors or in an area with poor ventilation unless exhaust hoses are used. Engine
exhaust contains carbon monoxide, a deadly, odorless and colorless gas which, if inhaled, can cause
nausea, fainting or death. Verify engine exhaust cannot seep into closed rooms or ventilation
equipment.

• DO NOT touch or lean against hot exhaust pipes or engine components.

• DO NOT clean air filter with gasoline or other types of low flash point solvents.

• DO NOT operate the unit without a functional exhaust system.

• Prolonged exposure to sound levels in excess of 85 dB(A) can cause permanent hearing loss. Wear
hearing protection when working around a running engine.

• Batteries contain sulfuric acid which can cause severe injury or death. Sulfuric acid can cause eye
damage, burn flesh or eat holes in clothing. Protective eye wear and clothing are necessary when
working on or around the battery. Always disconnect the negative (-) battery cable from the
corresponding terminal before performing any service on the engine or other components.

• DO NOT remove the radiator cap while the engine is hot.

• Keep area around exhaust pipes and air ducts free of debris to reduce the chance of an accidental fire.

SERVICE SAFETY

All service work must be performed by qualified personnel who are familiar with the equipment. Only a
qualified electrician should troubleshoot or repair electrical problems occurring in this equipment. Fol­low the safety guidelines described below to prevent hazardous situations which could result in severe
injury or death.

• DO NOT wash the unit with high pressure hoses, power washers, or steam cleaners. Water may
collect in the unit, causing damage to electrical parts.

• ALWAYS use extreme caution when servicing this unit in damp conditions. Do not service the unit if
your skin or clothing is wet. Do not allow water to collect around the base of the unit.

• Replace all missing and hard to read decals. Decals provide important operating instructions and
warn of dangers and hazards.

• ALWAYS turn the battery disconnect switch to the OFF position before performing any service on the
engine, generator, or any other components. Remove the negative (-) battery cable from the
corresponding terminal if the unit is to be stored or transported.

2 MGG155/210 Operating Manual 35319 C

• DO NOT start the unit under load. The main circuit breaker must be in the open position (press the

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right I/O button on the controller) when starting the unit.

TOWING SAFETY

Towing a trailer requires care. Both the trailer and vehicle must be in good condition and securely fastened
to each other to reduce the possibility of an accident. Some states require that large trailers be registered
and licensed. Contact your local Department of Transportation office to check on license requirements for
your particular unit.

• Verify the hitch and coupling on the towing vehicle are rated equal to, or greater than, the trailer's
Gross Vehicle Weight Rating (GVWR).

• Check trailer tires for wear and proper inflation.

• DO NOT tow trailer using defective parts. Inspect the hitch and coupling for wear or damage.

• Verify the trailer hitch and the coupling are compatible and the coupling is securely fastened to the
vehicle.

• Verify the directional and brake lights on the trailer are connected and working properly.

• See Towing the Trailer. Verify wheel lug nuts are present and tightened to the specified torque.

• Maximum recommended speed for highway towing is 45 mph (72 km/h). Recommended off-road
towing speed is 10 mph (16 km/h).

Safety

• When towing, maintain extra space between vehicles and avoid soft shoulders, curbs and sudden
lane changes. Practice turning, stopping and backing up in an area away from heavy traffic prior to
transporting unit.

• Wipe the coupler clean and apply fresh grease each time the trailer is towed to eliminate squeaking.

• Connect safety chains in a crossing pattern under the tongue and ATTACH THE BREAKAWAY
CABLE TO THE REAR BUMPER OF THE TOWING VEHICLE. Do not attach the cable to the trailer
hitch.

• The trailer is equipped with hydraulic or electric surge brakes. Verify proper operation of the brakes
by braking the vehicle at a slow speed before entering traffic. Both the trailer and the vehicle should
brake smoothly. If the trailer seems to be pushing, check the level in the brake fluid reservoir, if
equipped.

REPORTING TRAILER SAFETY DEFECTS

If you believe your trailer has a defect which 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 Generac Mobile Products
LLC.

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 an individual
problem between you, your Independent Authorized Service Dealer, or Generac Mobile Products LLC.

To contact NHTSA, you may either call the Auto Safety Hotline toll-free at 1-888-327-4236 (TTY:1-800-424-9153),
go to http://www.safercar.gov; or write to:

Administrator
NHTSA
1200 New Jersey Avenue S.E.
Washington, DC 20590

You can also obtain other information about motor vehicle safety from http://www.safercar.gov.

35319 C MGG155/210 Operating Manual 3

Safety

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SAFETY SYMBOL SUMMARY

The safety and operating decals affixed to the unit provide important instructions and warn of dangers and hazards.
Replace any missing or hard-to-read decals and use care when washing or cleaning the unit. Decal placement and
part numbers can be found in the online parts manual at www.generacmobileproducts.com. Below is a summary of
the intended meanings for the symbols used on the decals.

Safety alert symbol; used to alert
you to potential personal
injury hazards.

No open flames.

Unit electrical ground.

Wear protective gloves.

Explosion hazard.

Fire hazard.

Burn/scald hazard;
pressurized steam.

Hot surface(s) nearby.

Dangerous voltage may be
present.

Use protective eyewear.

Lift here only.

Read and understand the
supplied operator’s manual
before operating unit.

Belt/entanglement hazard; keep
body parts clear of this area.

Fan hazard; keep body parts
clear of this area.

Engine starting/remote starting point.

Engine can start automatically.

4 MGG155/210 Operating Manual 35319 C

Anchor/tie down point.

00844

Section 2 - General Information

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SPECIFICATIONS

GENERAC MODEL MGG155 MGG210

Engine

Make/Brand............................................................................. PSI ..........................................PSI

Model ......................................................................................D081TIC..................................D111TIC

Induction System ....................................................................Turbo CAC ..............................Turbo CAC

Horsepower - Prime - Natural Gas hp (kW) ..........................239 (178) ................................. 302 (225)

Horsepower - Standby - LP Liquid hp (kW) ...........................200 (149) .................................272 (203)

Operating Speed rpm .............................................................1800 ........................................ 1800

Displacement in

Cylinders - qty .........................................................................6 .............................................. 6

Spark plug gap in (mm)..........................................................0.015 (.4) .................................0.015 (.4)

Fuel Consumption (NG) - 100% load ft
Fuel Consumption (NG) - 75% load ft
Fuel Consumption (NG) - 50% load ft

Fuel Consumption (LP) - 100% load gal/hr (L/hr)..................15.4 (58.3) ...............................19.2 (72.7)

Fuel Consumption (LP) - 75% load gal/hr (L/hr)....................11.8 (44.7) ...............................14.7 (55.6)

Fuel Consumption (LP) - 50% load gal/hr (L/hr)....................8.3 (31.4) .................................10.2 (38.6)

Battery Type - Group Number .................................................8D............................................8D

Battery Voltage (quantity per unit)...........................................12V (2) .................................... 12V (2)

Battery Voltage (series connection) ........................................24V..........................................24V

Battery Rating .........................................................................1100CCA................................. 1100CCA

3

(L) ..............................................................494 (8.1) ..................................673 (11.0)

3

/hr (m3/hr) ..............1092 (30.9) .............................. 1431 (40.5)

3

/hr (m3/hr) ................858 (24.3) ................................ 1112 (31.5)

3

/hr (m3/hr) ................625 (17.7) ................................ 794 (22.5)

Generator

Make/Brand............................................................................. Stamford..................................Stamford

Model ......................................................................................UCI274E-311...........................UCI274G-311

Type, Insulation....................................................................... Brushless, H............................Brushless, H

See the data plate on the generator for rated watts, amperes, frequency, voltage, phase and other important information.

Generator Set (Engine/Generator)

3Ø - Continuous - Natural Gas kW (kVA) ..............................100 (125) ................................. 137 (171)

3Ø - Standby - LP Liquid kW (kVA) ........................................ 108 (135).................................139 (173)

Amps - 3Ø Continuous - Natural Gas (480V/277) A ...............150 .........................................206

Amps - 3Ø Standby - Natural Gas (480V/277) A ....................214 .........................................278

Amps - 3Ø Standby - LP Liquid (480V/277) A .......................162 .......................................... 209

Frequency Hz .........................................................................60 ............................................ 60

Power Factor........................................................................... 0.8 ..........................................0.8

AC Distribution

Circuit Breaker Size A............................................................. 200 ..........................................400

Voltage Regulation..................................................................Digital ......................................Digital

Voltages Available 3Ø .............................................................480 (277/480)..........................480 (277/480)

Capacities

Coolant (incl. engine) qt (L) ...................................................20 (18.9)..................................22 (20.8)

Oil (incl. filter) qt (L) ...............................................................7.2 (6.81).................................7.6 (7.19)

Weights

Operating Weight, Skid Mounted lbs (kg) .............................7245 (3286).............................7290 (3307)

Operating Weight, Trailer Mounted lbs (kg) ..........................9645 (4375) .............................9890 (4486)

Trailer

Number of Axles......................................................................2 ..............................................2

Capacity - Axle Rating lbs (kg) ............................................... 7000 (3175).............................7000 (3175)

Tire Size in .............................................................................16 ............................................ 16

Brakes - Standard ...................................................................Electric ....................................Electric

Hitch - Standard ......................................................................3" lunette ring ..........................3" lunette ring

Maximum Tire Pressure psi ...................................................80 ............................................80

Specifications are subject to change without notice.

35319 C MGG155/210 Operating Manual 5

General Information

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Unit Dimensions

B

A

B

A

Figure 1 - Unit Dimensions

ABC

MGG155 - Skid Mounted 66 in. (1.67 m) 92 in. (2.33 m) 169 in. (4.29 m)

C

C

02020

MGG155 - Trailer Mounted 102 in. (2.59 m) 124 in. (3.15 m) 269 in. (6.83 m)

MGG210 - Skid Mounted 66 in. (1.67 m) 92 in. (2.33 m) 201 in. (5.10 m)

MGG210 - Trailer Mounted 102 in. (2.59 m) 124 in. (3.15 m) 269 in. (6.83 m)

Specifications are subject to change without notice.

Engine Oil Recommendations

To maintain the product warranty, the engine oil should be serviced in accordance with the recommendations of this
manual. For your convenience, Generac Maintenance Kits are available that include engine oil, oil filter, air filter,
spark plug(s), a shop towel and funnel. These kits can be obtained from an Independent Authorized Service Dealer
(IASD).

The engine has been filled with factory engine oil of a grade recommended by the engine supplier. The manufacturer
recommends an initial oil and filter change after the first 50 hours (or first three months) of service operation. Use a
high quality detergent oil with an appropriate classification and viscosity for the engine type and ambient temperature
conditions. See Specifications for oil capacity.

6 MGG155/210 Operating Manual 35319 C

General Information

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• SAE 15W-40 low ash

• API CD/CF or higher

Coolant Recommendation

See the OEM engine manual for coolant type. Normally a 50/50 mix of coolant and water is required. Coolant system
capacity is listed in Specifications.

DANGER

RISK OF POISONING. DO NOT USE MOUTH TO SIPHON COOLANT. DOING SO WILL

RESULT IN DEATH OR SERIOUS INJURY. (000149)

WARNING

DO NOT open coolant system until engine has completely cooled. Doing so could

result in serious injury. (000154)

CAUTION

Do not use any chromate base rust inhibitor with propylene glycol base antifreeze, boosters

or additives. Doing so will cause overheating. (000165)

UNIT SERIAL NUMBER LOCATIONS

See Figure 2 to locate the unit ID tag and Vehicle Identification Number (VIN) tag on the unit. Important information,
such as the unit serial number, model number, VIN and tire loading information are found on these tags. Record the
information from these tags so it is available if the tags are lost or damaged. When ordering parts or requesting
assistance, you may be asked to provide this information.

UNIT ID Tag

Manufactured by Generac Mobile Products LLC,
a subsidiary of Generac Power Systems, Inc.

[phone] [phone]

Country of Origin

Manufacturing Code

1 ph. 1.0PF 3 ph. .8PF 3 ph. 1.0PF

KW

KVA

V

A

Model

Weight (lbs/kg) RPM/Frequency

Located on control panel

(behind door)

Serial Number

Rating

FOR ELECTRICAL EQUIPMENT

Ins. Class

ONLY. POUR MATERIAL

ELECTRIQUE SEULEMENT.

209649

Form: SFC626B

VIN Tag

MANUFACTUREDBY/FABRIQUE PAR: Generac Mobile Products LLC DATE: 00/0000
GVWR/PNBV: 000KG (0000LBS) COLDINF. PRESS./
PRESS.DE

GAWR / PNBE TIRE / PNEU RIM / JANTE GONF A FROID - KPA(PSI/LPC) SGL / DUAL

EACH
AXLE

THIS VEHICLE CONFORMS TOALLAPPLICABLE STANDARDS PRESCRIBED UNDER THE U.S. FEDERAL MOTOR VEHICLE SAFETY STANDARDS(FMVSS)AND CANADIAN
MOTOR VEHICLE SAFETY REGULATIONS IN EFFECT ONTHE DATE OF MANUFACTURE.

CE VEHICULE EST CONFORMEATOUTES LES NORMES QUI LUI SONT APPLICABLES EN VERTU DU REGLEMENT SUR LA SECURITE DES VEHICULESAUTOMOBILES DU CANADA EN VIGUEUR A LA DATE SA
FABRICATION.

00000000000000000

V.I.N./N.I.V.:

XXX000

MODEL:

TYPE: TRAILER

TIRE AND LOADING INFORMATION

RENSEIGNEMENTS SUR LES

The weight of cargo should never exceed 0000KG (0000LBS)
Le poids du chargement ne doit jamais depasser 0000KG (0000LBS)

PNEUS ET LE CHARGEMENT

RENSEIGNEMENTS

SEE OWNER’S
MANUAL FOR

ADDITIONAL

INFORMATION

VOIR LE

MANUEL DE

L’USAGER

POUR

PLUS DE

02063

Figure 2 - Serial Number Locations

35319 C MGG155/210 Operating Manual 7

General Information

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COMPONENT LOCATIONS

2

1

7

8

9

Figure 3 - MGG155 - Left Side

1. Catalyst exhaust muffler 6. Dipstick

2. Air filter 7. Alternator

3. Battery disconnect switch 8. Coolant drain

4. Starter 9. Oil reservoir

5.

12 volt batteries (2)

3

4

5

6

02032

8 MGG155/210 Operating Manual 35319 C

General Information

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2

1

6

7

8

9

10

Figure 4 - MGG210 - Left Side

1. Catalyst exhaust muffler 6. Dipstick

2. Air filter 7. Alternator

3. Battery disconnect switch 8. Engine heater (optional)

4. Starter motor 9. Coolant drain

5. 12 volt batteries (2) 10. Oil reservoir

3

4

5

02033

35319 C MGG155/210 Operating Manual 9

General Information

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2

1

5

6

7

13

12

11

10

Figure 5 - MGG155 and MGG210 - Right Side (MGG155 Shown)

1. Oil fill cap 8. Customer connection box

2. Silencer 9. Generator output connections

3. LP (liquid) inlet 10. Emergency stop switch

4. Natural gas (well gas) inlet 11. Main circuit breaker

5. Oil level controller 12. Control panel (see Figure 7)

6. Oil drain 13. Manual holder

7.

Customer convenience receptacles

8

9

3

4

02034

10 MGG155/210 Operating Manual 35319 C

General Information

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3

1

2

654

7

8

16

15

Figure 6 - Fuel System (MGG155 Shown)

1. Air filter 9. LP liquid inlet

2. Electronic throttle control 10. Natural gas (well gas) inlet

3. Integrated electronic pressure regulator 11. Manual ball valve (natural gas)

4. Natural gas lock-off 12. Strainer access

5. LP liquid lock-off 13. Pressure gauge (psi)

6. Vaporizer 14. Pressure regulator

7. Pressure switch 15. Access for regulator adjustment

8. Pressure gauge (inch WC) 16. Fuel/air mixer

14

13

12

11

10

9

00720

35319 C MGG155/210 Operating Manual 11

General Information

EMERGENCY STOP

VOLTAGE

ADJUST

OFF

ON

PANEL

LIGHTS

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CONTROL PANEL

1

2

3

4

5

DC CIRCUIT

BREAKER

6

CONTROLLER

PANEL

LIGHT FUSE

FUSE

10

2

EMERGENCY STOP

VOLTAGE
ADJUST

ON

OFF

PANEL

LIGHTS

7

8

9

00578

Figure 7 - MGG155 and MGG210 Control Panel

1. Alarm horn 6. Digital controller

2. Panel light 7. Emergency stop switch (not on all units)

3. Panel light fuse (10A) 8. Voltage adjustment

4. Controller fuse (5A) 9. Panel lights switch

5. DC circuit breaker 10. Main circuit breaker

12 MGG155/210 Operating Manual 35319 C

ELECTRICAL PANEL

Discount-Equipment.com

General Information

FUEL SELECT SWITCH

AUTO

NG

LP

TB1

1" X 2" WIREWAY

8

TB2

1

7

2

6

SR

5

4

3

FR

STR

CBCR

CBOR

iG-AVRi

iG-AVRi

TRANS/LV

5A FUSE

F3

TB3

02031

Figure 8 - Electrical Panel (Located Behind Control Panel Door)

1. Fuel select switch 5. Shunt trip relay

2. Terminal block (3) 6. Fuel relay

3. Circuit breaker open relay 7. Starter relay

4. Circuit breaker closed relay 8. Relay protection fuse (5A)

35319 C MGG155/210 Operating Manual 13

General Information

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UNIT SET UP

This unit is designed to operate with natural gas or well gas as the primary fuel and LP liquid as the secondary fuel.
For units operating on well site gas, a well test must be performed prior to installation of the unit.

Well Site Approval

A well gas chromatography analysis must be performed prior to installation of the unit. A copy of the test report must
be sent to, and preapproved by, Generac Power Systems. If the unit is moved to a new location, a new well test
must be performed. For more information, contact Generac Mobile Products Technical Support.

The unit should be installed, serviced, tested, adjusted, and otherwise prepared for use by an Independent Authorized
Service Dealer. The owner is responsible for ensuring the unit emission control system meets all applicable state
and local regulations.

WARNING

Risk of Fire. Unit must be positioned in a manner that prevents combustible material

accumulation underneath. Failure to do so could result in death or serious injury.

(000147)

Fuel Connections

Almost all operation problems are related to the installation techniques used. DO NOT guess, be sure pipe size is
adequate for required flow rate. See Table 1, Table 2 and Table 3.

Natural Gas Connections

Follow the steps below:

1. Before connecting the natural gas fuel line to the unit, apply pipe sealant to the NPT threads of the fitting at
the end of the fuel line.

Note: Do not apply pipe sealant to the flared (flanged) end of the fitting.

2. Connect the fuel line to the two inch inlet, located on the right side of the unit’s frame.

3. Be certain that all connections are sealed and no leaks are present. The installer must verify that all gas

connections comply with all building codes.

4. Verify fuel supply pressure is adequate.

Purging the Natural Gas Fuel Line

After initial setup, it may be necessary to purge the natural gas fuel line before operating the unit. LP liquid must be
available as a secondary fuel to perform this procedure.

1. Open the control door located at the back of the unit.

2. Remove the three screws securing the left control panel door. A Fuel Select switch is located behind the

door. See Figure 8.

3. Move the Fuel Select switch to the LP or AUTO position.

14 MGG155/210 Operating Manual 35319 C

General Information

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FUEL SELECT SWITCH

AUTO

NG

LP

00651

Figure 9 - Fuel Select Switch

4. Apply pipe sealant to the NPT threads of the pipe fitting at the end of the natural gas fuel line. Connect the

fuel line to the two inch inlet located on the right side of the unit’s frame.

Note: Do not apply pipe sealant to the flared (flanged) end of the fuel pipe.

5. Apply pipe sealant to the NPT threads of the pipe fitting at the end of the LP liquid fuel line. Connect the fuel

line to the 1/2 inch inlet located on the right side of the unit’s frame.

6. Be certain that all connections are sealed and no leaks are present. The installer must verify that all gas

connections comply with all building codes.

7. Verify fuel supply pressure is adequate.

Formula Example:

If a unit has a 160 hp engine 60 feet from the supply, the engine needs 10,000 BTU/hr per hp to run efficiently. For
natural gas fuel, there are 1015 BTU/ft3. From Table 1, a 60 foot run requires a minimum 1 inch pipe at full engine load.

160 hp x 10,000 BTU/Hr per hp = 1,600,000 BTU’s / per hour for proper operation

1,600,000

1, 015

Note: The incoming pressure must be approximately 20 psi to unit.

= 1576 cubic feet per hour

35319 C MGG155/210 Operating Manual 15

General Information

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Table 1 - Natural Gas Flow Rate (ft3 / m3 Per Hour) per Pipe Length

Pipe

Length

1/2 in

(1 cm)

3/4 in

(2 cm)

1 in

(3 cm)

1−1/4 in

(3 cm)

1−1/2″
(4 cm)

Iron Pipe Size

2 in

(5 cm)

2−1/2 in

(6 cm)

3 in

(8 cm)

3–1/2 in

(9 cm)

4 in

(10 cm)

5 in

(13 cm)

6 in

(15 cm)

10 ft

(3 m)

20 ft

(6 m)

25 ft

(8 m)

30 ft

(9 m)

35 ft

(11 m)

40 ft

(12 m)

45 ft

(14 m)

50 ft

(15 m)

60 ft

(18 m)

70 ft

(21 m)

80 ft

(24 m)

90 ft

(27 m)

100 ft

(30 m)

125 ft

(38 m)

150 ft

(46 m)

200 ft

(61 m)

300 ft
(91 m

400 ft

(122 m)

500 ft

(152 m)

1,000 ft
(305 m)

1,500 ft
(457 m)

2,000 ft
(610 m)

2,723 ft
(830 m)

1,926 ft
(587 m)

1,722 ft
(525 m)

1,572 ft
(479 m)

1,456 ft
(444 m)

1,362 ft
(415 m)

1,284 ft
(391 m)

1,218 ft
(371 m)

1,112 ft
(339 m)

1,029 ft
(314 m)

963 ft

(294 m)

908 ft

(277 m)

861 ft

(262 m)

770 ft

(235 m)

703 ft

(214 m)

609 ft

(186 m)

497 ft

(151 m)

431 ft

(131 m)

385 ft

(117 m)

272 ft

(83 m)

222 ft

(68 m)

193 ft

(59 m)

5,765 ft

(1,757 m)

4,076 ft

(1,242 m)

3,646 ft

(1,111 m)

3,328 ft

(1,014 m)

3,082 ft
(939 m)

2,883 ft
(879 m)

2,718 ft
(828 m)

2,578 ft
(786 m)

2,354 ft
(717 m)

2,179 ft
(664 m)

2,038 ft
(621 m)

1,922 ft
(586 m)

1,823 ft
(556 m)

1,631 ft
(497 m)

1,489 ft
(454 m)

1,289 ft
(393 m)

1,053 ft
(321 m)

912 ft

(278 m)

815 ft

(248 m)

577 ft

(176 m)

471 ft

(144 m)

408 ft

(124 m)

10,975 ft

(3,345 m)

7,760 ft

(2,365 m)

6,941 ft

(2,116 m)

6,336 ft

(1,931 m)

5,866 ft

(1,788 m)

5,487 ft

(1,672 m)

5,174 ft

(1,577 m)

4,908 ft

(1,496 m)

4,480 ft

(1,366 m)

4,148 ft

(1,264 m)

3,880 ft

(1,183 m)

3,658 ft

(1,115 m)

3,471 ft

(1,058 m)

3,104 ft
(946 m)

2,834 ft
(864 m)

2,454 ft
(748 m)

2,004 ft
(611 m)

1,735 ft
(529 m)

152 ft

(46 m)

1097 ft

(334 m)

896 ft

(273 m)

776 ft

(237 m)

22,804 ft

(6,951 m)

16,125 ft

(4,915 m)

14,422 ft

(4,396 m)

13,166 ft

(4,013 m)

12,189 ft

(3,715 m)

11,402 ft

(3,475 m)

10,750 ft

(3,277 m)

10,198 ft

(3,108 m)

9,310 ft

(2,838 m)

8,619 ft

(2,627 m)

8,062 ft

(2,457 m)

7,601 ft

(2,317 m)

7,211 ft

(2,198 m)

6,450 ft

(1,966 m)

5,888 ft

(1,795 m)

5,099 ft

(1,554 m)

4,163 ft

(1,269 m)

3,606 ft

(1,099 m)

3,225 ft
(983 m)

2,280 ft
(695 m)

1,862 ft
(568 m)

1,612 ft
(491 m)

34,398 ft

(10,485 m)

24,323 ft

(7,414 m)

21,755 ft

(6,631 m)

19,860 ft

(6,053 m)

18,386 ft

(5,604 m)

17,199 ft

(5,242 m)

16,215 ft

(4,942 m)

15,383 ft

(4,689 m)

14,043 ft

(4,280 m)

13,001 ft

(3,963 m)

12,161 ft

(3,707 m)

11,466 ft

(3,495 m)

10,878 ft

(3,316 m)

9,729 ft

(2,965 m)

8,881 ft

(2,707 m)

7,692 ft

(2,345 m)

6,280 ft

(1,914 m)

5,439 ft

(1,658 m)

4,865 ft

(1,483 m)

3,440 ft

(1,049 m)

2,809 ft
(856 m)

2,432 ft
(741 m)

66,973 ft

(20,413 m)

47,357 ft

(14,434 m)

42,358 ft

(12,911 m)

38,667 ft

(11,786 m)

35,799 ft

(10,912 m)

33,487 ft

(10,207 m)

31,572 ft

(9,623 m)

29,951 ft

(9,129 m)

27,342 ft

(8,334 m)

25,314 ft

(7,716 m)

23,679 ft

(7,217 m)

22,324 ft

(6,804 m)

21,179 ft

(6,455 m)

18,943 ft

(5,774 m)

1,292 ft
(394 m)

14,976 ft

(4,565 m)

12,228 ft

(3,727 m)

10,589 ft

(3,228 m)

9,471 ft

(2,887 m)

6,697 ft

(2,041 m)

5,468 ft

(1,667 m)

4,736 ft

(1,444 m)

107,577 ft

(32,789 m)

76,068 ft

(23,186 m)

68,037 ft

(20,738 m)

62,109 ft

(18,931 m)

57,502 ft

(17,527 m)

53,788 ft

(16,395 m)

50,712 ft

(15,457 m)

48,110 ft

(14,664 m)

43,918 ft

(13,386 m)

40,660 ft

(12,393 m)

38,034 ft

(11,593 m)

35,859 ft

(10,930 m)

34,019 ft

(10,369 m)

30,427 ft

(9,274 m)

27,776 ft

(8,466 m)

24,055 ft

(7,332 m)

19,641 ft

(5,987 m)

17,009 ft

(5,184 m)

15,214 ft

(4,637 m)

10,758 ft

(3,279 m)

8,784 ft

(2,677 m)

7,607 ft

(2,319 m)

191,989 ft

(58,518 m)

135,757 ft

(41,379 m)

121,424 ft

(37,010 m)

110,845 ft

(33,786 m)

102,622 ft

(31,279 m)

95,994 ft

(29,259 m)

90,504 ft

(27,586 m)

85,860 ft

(26,170 m)

78,379 ft

(23,890 m)

72,565 ft

(22,118 m)

67,878 ft

(20,689 m)

63,996 ft

(19,506 m)

60,712 ft

(18,505 m)

54,303 ft

(16,552 m)

49,571 ft

(15,109 m)

42,930 ft

(13,085 m)

35,052 ft

(10,684 m)

30,356 ft

(9,253 m)

27,151 ft

(8,276 m)

19,199 ft

(5,852 m)

15,676 ft

(4,778 m)

13,576 ft

(4,138 m)

282,890 ft

(86,225 m)

200,034 ft

(60,970 m)

178,915 ft

(54,533 m)

163,327 ft

(49,782 m)

151,211 ft

(46,089 m)

141,445 ft

(43,112 m)

133,356 ft

(40,647 m)

126,512 ft

(38,561 m)

115,489 ft

(35,201 m)

106,922 ft

(32,590 m)

100,017 ft

(30,485 m)

94,297 ft

(28,742 m)

89,458 ft

(27,267 m)

80,013 ft

(24,388 m)

73,042 ft

(22,263 m)

63,256 ft

(19,280 m)

51,648 ft

(15,742 m)

44,729 ft

(13,633 m)

40,007 ft

(12,194 m)

28,289 ft

(8,622 m)

23,098 ft

(7,040 m)

20,003 ft

(6,097 m)

396,270 ft

(120,783 m)

280,205 ft

(85,406 m)

250,623 ft

(76,390 m)

228,787 ft

(69,734 m)

211,815 ft

(64,561 m)

198,135 ft

(60,392 m)

186,804 ft

(56,938 m)

177,217 ft

(54,016 m)

161,777 ft

(49,310 m)

149,776 ft

(46,652 m)

140,103 ft

(42,703 m)

132,090 ft

(40,261 m)

125,312 ft

(38,195 m)

112,082 ft

(34,163 m)

102,317 ft

(31,186 m)

88,609 ft

(27,008 m)

72,349 ft

(22,052 m)

62,656 ft

(19,098 m)

56,041 ft

(17,081 m)

39,627 ft

(12,078 m)

32,355 ft

(9,862 m)

28,021 ft
(8541 m)

724,020 ft

(220,681 m)

511,959 ft

(156,045 m)

457,910 ft

(139,571 m)

418,013 ft

(127,410 m)

387,005 ft

(117,959 m)

362,010 ft

(110,341 m)

341,306 ft

(104,030 m)

323,791 ft

(98,692 m)

295,580 ft

(90,093 m)

273,654 ft

(83,410 m)

255,980 ft

(78,023 m)

241,340 ft

(73,560 m)

228,955 ft

(69,785 m)

204,784 ft

(62,418 m)

186,941 ft

(56,980 m)

161,896 ft

(49,346 m)

132,187 ft

(40,291 m)

114,478 ft

(34,893 m)

102,392 ft

(31,209 m)

72,402 ft

(22,068 m)

59,116 ft

(18,019 m)

51,196 ft

(15,605 m)

1,181,799 ft
(360,212 m)

838,658 ft

(255,623 m)

747,435 ft

(227,818 m)

682,312 ft

(207,969 m)

631,698 ft

(192,542 m)

590,900 ft

(180,106 m)

557,105 ft

(169,806 m)

528,517 ft

(161,092 m)

482,467 ft

(147,056 m)

446,678 ft

(136,148 m)

417,829 ft

(127,354 m)

393,933 ft

(120,071 m)

373,718 ft

(113,909 m)

334,263 ft

(101,883 m)

305,139 ft

(93,006 m)

264,258 ft

(80,546 m)

215,766 ft

(65,765 m)

186,859 ft

(56,955 m)

167,132 ft

(50,942 m)

118,180 ft

(36,021 m)

96,493 ft

(29,411 m)

83,566 ft

(25,471 m)

16 MGG155/210 Operating Manual 35319 C

General Information

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LP Liquid Connections (Liquid Withdrawal System)

Use the following chart to determine the supply pipe size for LP liquid.

Formula Example:

If a unit has a 135 hp engine 80 feet from the supply, the engine needs 449 ft3/hr of LP vapor to run efficiently. For
liquid propane vapor fuel, there is 2500 BUT/ft3. From Table 2, an 80 foot run requires a minimum 1/4 inch pipe at
full engine load.

3

2500 ft

*Cubic feet of vapor at 60°F (16°C) per gallon of liquid at 60°F (16°C).

/hr x 449 ft3/hr = 1,122,500 BTU/ft

3

449 ft

/hr

36.39*

= 12.33 gallons per hour

3

35319 C MGG155/210 Operating Manual 17

General Information

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Liquid

Propane

Flow

10 gal/hr

(38 L/hr)

15 gal/hr

(57 L/hr)

20 gal/hr

(76 L/hr)

40 gal/hr

(151 L/hr)

60 gal/hr

(227 L/hr)

80 gal/hr

(303 L/hr)

100 gal/hr

(379 L/hr)

120 gal/hr

(454 L/hr)

140 gal/hr

(530 L/hr)

160 gal/hr

(606 L/hr)

180 gal/hr

(681 L/hr)

200 gal/hr

(757 L/hr)

240 gal/hr

(908 L/hr)

280 gal/hr

(1,060 L/hr)

300 gal/hr

(1,136 L/hr)

350 gal/hr

(1,325 L/hr)

400 gal/hr

(1,514 L/hr)

1/4 in

(0.6 cm)

Schedule Schedule Schedule Schedule Schedule Schedule Schedule

40 80 40 80 40 80 40 80 40 80 40 80 40 80

729 ft

(222 m)

324 ft

(99 m)

182 ft

(55 m)

46 ft

(14 m)

20 ft

(6 m)

11 ft

(3 m)

(2 m)

416 ft

(127 m)

185 ft

(56 m)

104 ft

(32 m)

(8 m)

(3 m)

(2 m)

7 ft

(1 m)

- - 23 ft

- - 15 ft

- - 13 ft

- - - - 37 ft

- - - - 30 ft

- - - - 21 ft

- - - - 15 ft

- - - - 13 ft

------38 ft

------30 ft

26 ft

11 ft

6 ft

4 ft

Table 2 - LP Liquid Line Sizing Chart

Iron Pipe Size

3/8 in

(1 cm)

----------- -

----------- -

825 ft

(251 m)

205 ft

(62 m)

92 ft

(28 m)

51 ft

(16 m)

33 ft

(10 m)

(7 m)

(5 m)

(4 m)

521 ft

(159 m)

129 ft

(39 m)

58 ft

(18 m)

32 ft

(10 m)

21 ft

(6 m)

15 ft

(5 m)

9 ft

(3 m)

8 ft

(2 m)

1/2 in

(1 cm)

3/4 in

(2 cm)

1 in

(3 cm)

1-1/4 in

(3 cm)

1-1/2 in

(4 cm)

Distance

----------

745 ft

(227 m)

331 ft

(101 m)

187 ft

(57 m)

119 ft

(36 m)

83 ft

(25 m)

61 ft

(19 m)

47 ft

(14 m)

(11 m)

(9 m)

(6 m)

(5 m)

(4 m)

504 ft

(154 m)

224 ft

(68 m)

127 ft

(39 m)

81 ft

(25 m)

56 ft

(17 m)

41 ft

(12 m)

32 ft

(10 m)

25 ft

(8 m)

20 ft

(6 m)

14 ft

(4 m)

10 ft

(3 m)

9 ft

(3 m)

------- -

------- -

735 ft

(224 m)

470 ft

(143 m)

326 ft

(99 m)

240 ft

(73 m)

184 ft

(56 m)

145 ft

(44 m)

118 ft

(36 m)

81 ft

(25 m)

60 ft

(18 m)

52 ft

(16 m)

(12 m)

(9 m)

537 ft

(164 m)

343 ft

(105 m)

238 ft

(73 m)

175 ft

(53 m)

134 ft

(41 m)

106 ft

(32 m)

86 ft

(26 m)

59 ft

(18 m)

44 ft

(13 m)

38 ft

(12 m)

28 ft

(9 m)

22 ft

(7 m)

----- -

----- -

----- -

813 ft

(248 m)

623 ft

(190 m)

491 ft

(150 m)

399 ft

(122 m)

277 ft

(84 m)

204 ft

(62 m)

177 ft

(54 m)

130 ft

(40 m)

99 ft

(30 m)

618 ft

(188 m)

473 ft

(144 m)

373 ft

(114 m)

303 ft

(92 m)

211 ft

(64 m)

155 ft

(47 m)

135 ft

(41 m)

99 ft

(30 m)

75 ft

(23 m)

--- -

--- -

--- -

--- -

--- -

--- -

785 ft

(239 m)

578 ft

(176 m)

433 ft

(132 m)

623 ft

(190 m)

459 ft

(140 m)

344 ft

(105 m)

--

--

980 ft

(299 m)

794 ft

(242 m)

How to use chart:

1. Having determined the required flow at point of use, locate this flow in the left hand column. If this falls between
two figures, use the larger of the two.

2. Determine total length of piping required from source to point of use.

18 MGG155/210 Operating Manual 35319 C

General Information

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3. Read across chart from left (required flow) to right to find the total length which is equal to, or exceeds, the

distance from source to use.

4. From this point, read up to find the correct size of pipe required.

Valve and Fitting Pipe Equivalents

Table 3 - Valve & Fitting Pipe Equivalents

Equivalent Length Of Steel Pipe

Nominal Pipe Size (NPT)

Fitting

45° Screwed

Elbow

90° Screwed

Elbow

Screwed T

Thru Run

Screwed T

Thru Branch

Screwed

Globe Valve*

Screwed

Angel Valve*

Flanged

Globe Valve*

Flanged

Angle Valve*

3/4 in

(2 cm)

1 in

(3 cm)

1-1/4 in

(3 cm)

1-1/2 in

(4 cm)

2 in

(5 cm)

2-1/2 in

(6 cm)

3 in

(8 cm)

Schedule Schedule Schedule Schedule Schedule Schedule Schedule

40 80 40 80 40 80 40 80 40 80 40 80 40 80

1.2 ft

(0.4 m)

1.8 ft

(0.5 m)

1.4 ft

(0.4 m)

4.6 ft

(1.4 m)

14.0 ft

(4.3 m)

11.0 ft

(3.4 m)

0.9 ft

(0.3 m)

1.6 ft

(0.5 m)

1.3 ft

(0.4 m)

4.0 ft

(1.2 m)

10.0 ft

(3.0 m)

8.0 ft

(2.4 m)

- - - - - - 30.0 ft

- - - - - - 12.0 ft

1.3 ft

(0.4 m)

2.3 ft

(0.7 m)

1.7 ft

(0.5 m)

5.6 ft

(1.7 m)

21.0 ft

(6.4 m)

13.0 ft

(4.0 m)

1.2 ft

(0.4 m)

2.1 ft

(0.6 m)

1.6 ft

(0.5 m)

5.3 ft

(1.6 m)

16.0 ft

(4.9 m)

10.0 ft

(3.0 m)

1.7 ft

(0.5 m)

3.1 ft
(0.9)

2.4 ft

(0.7 m)

7.9 ft

(2.4 m)

24.0 ft

(7.3 m)

10.5 ft

(3.2 m)

1.5 ft

(0.5 m)

2.9 ft
(0.9)

2.3 ft

(0.7 m)

7.3 ft

(2.2 m)

19.0 ft

(5.8 m)

8.5 ft

(2.6 m)

2.0 ft

(0.6 m)

3.7 ft

(1.1 m)

2.8 ft

(0.9 m)

9.3 ft

(2.8 m)

39.0 ft

(11.9 m)

20.0 ft

(6.1 m)

(9.1 m)

(3.7 m)

1.8 ft

(0.5 m)

3.4 ft

(1.0 m)

2.6 ft

(0.8 m)

8.6 ft

(2.6 m)

27.0 ft

(8.2 m)

16.0 ft

(4.9 m)

24.0 ft

(7.3 m)

10.0 ft

(3.0 m)

2.6 ft

(0.8 m)

4.6 ft

(1.4 m)

3.6 ft

(1.1 m)

12.0 ft

(3.7 m)

42.0 ft

(12.8 m)

32.0 ft

(9.8 m)

4.10 ft

(1.2 m)

14.5 ft

(4.4 m)

2.4 ft

(0.7 m)

4.4 ft

(1.3 m)

3.3 ft

(1.0 m)

11.0 ft

(3.4 m)

34.5 ft

(10.5 m)

26.5 ft

(8.1 m)

34.0 ft

(10.4 m)

12.0 ft

(3.7 m)

3.0 ft

(0.9 m)

5.3 ft

(1.6 m)

4.2 ft

(1.3 m)

15.0 ft

(4.6 m)

24.0 ft

(7.3 m)

7.5 ft

(2.3 m)

2.8 ft

(0.9 m)

5.1 ft

(1.6 m)

4.0 ft

(1.2 m)

14.0 ft

(4.3 m)

20.0 ft

(6.1 m)

6.0 ft

(1.8 m)

- - 46.0 ft

- - 19.0 ft

3.8 ft

(1.2 m)

6.9 ft

(2.1 m)

5.4 ft

(1.6 m)

17.0 ft

(5.2 m)

46.0 ft

(14.0 m)

19.0 ft

(5.8 m)

(14.0)

(5.8 m)

3.7 ft

(1.1 m)

6.5 ft
(2.0)

5.0 ft

(1.5 m)

16.0 ft

(4.9 m)

39.0 ft

(11.9 m)

16.0 ft

(4.9 m)

39.0 ft

(11.9 m)

16.0 ft

(4.9 m)

* Reg O A7500 series valves.

Electrical Connections

Class 1 wiring methods must be used for field wiring connections to terminals of a class 2 circuit. It is the responsibility
of the owner/operator to arrange for these procedures to be performed by a licensed electrical contractor and ensure
conformance to all applicable codes, including local codes specific to your municipality/city/county and state. Wire
size and insulation type should be as required by National Electrical Code (NEC), state and local regulations.

DANGER

ELECTROCUTION. NEVER CONNECT THIS UNIT TO THE ELECTRICAL SYSTEM OF
ANY BUILDING UNLESS A LICENSED ELECTRICIAN HAS INSTALLED AN APPROVED

TRANSFER SWITCH. FAILURE TO DO SO WILL RESULT IN DEATH OR SERIOUS

INJURY. (000150)

35319 C MGG155/210 Operating Manual 19

General Information

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WARNING

Only qualified service personnel may install, operate and maintain this equipment.

Failure to follow proper installation requirements could result in death, serious injury,

and damage to equipment or property. (000182)

DANGER

ELECTROCUTION. VERIFY ELECTRICAL SYSTEM IS PROPERLY GROUNDED

BEFORE APPLYING POWER. FAILURE TO DO SO WILL RESULT IN DEATH OR

SERIOUS INJURY. (000152)

DUAL FUEL SYSTEM

This unit is equipped with a dual fuel system. This type of fuel system allows the unit to run on either natural gas
(primary) or LP liquid (secondary). In the event that the primary source becomes unavailable, the unit will automatically
switch to the secondary source. It can do so while in operation.

Natural Gas (Well Gas) Fuel System

Natural gas is supplied from a utility supply line or well site in its vapor state through in-ground piping. The vapor
enters the large fuel inlet located on the right side of the unit frame.

LP Liquid Withdrawal Fuel System

LP is supplied as a liquid in pressurized tanks. The liquid must be converted to its gaseous state before it is introduced
into the engine carburetor. The unit is equipped with a vaporizer converter to accomplish this. The LP liquid enters
the fuel system through the small fuel inlet located on the right side of the frame. As the liquid passes through the
vaporizer, heated engine coolant is passed through the vaporizer to provide the necessary heat for conversion of
the fuel from a liquid to a gaseous state.

DANGER

EXPLOSION AND FIRE. FUEL AND VAPORS ARE EXTREMELY FLAMMABLE AND

EXPLOSIVE. ADD FUEL IN A WELL VENTILATED AREA. KEEP FIRE AND SPARK

AWAY. FAILURE TO DO SO WILL RESULT IN DEATH OR SERIOUS INJURY. (000105)

IMPORTANT: THIS UNIT IS NOT DESIGNED TO OPERATE ON LP VAPOR. If your LP supply tank does

not have a liquid withdrawal system, a licensed LP supply company will need to install the correct fitting to

allow for it. For special fuel system configurations, contact Generac Mobile Products Technical Support.

DC FUSES

Located inside the control panel, the fuses protect the control panel wiring and components from damaging overload.
For fuse location and identification, see Figure 7.

GENERATOR AND LOAD COMPATIBILITY

This unit is a revolving field, alternating current type generator set. The generator is designed to supply electrical
power for the operation of compatible electrical loads.

The generator must be fully compatible with the rated voltage, phase rotation, and frequency of the connected
electrical loads. The generator, connected electrical devices, or both, can be damaged if voltage, phase, and frequency
are not compatible.

See the data label affixed to the unit for rated AC voltage, wattage, amperage, number of phases, etc.

20 MGG155/210 Operating Manual 35319 C

General Information

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ENGINE/GENERATOR PROTECTIVE DEVICES

The unit may be required to operate for long periods of time without an operator on hand to monitor operating
conditions. For this reason, the unit has numerous sensors to provide the control panel with the information it needs
to protect both the engine and generator. The control panel is designed to shut down the engine if potentially damaging
conditions occur. These conditions can include low oil pressure, high coolant temperature, low coolant level, engine
overspeed, over or under voltage, over or under frequency, etc. These settings are configured at the factory and can
be changed/adjusted by an Independent Authorized Service Dealer if required.

DIGITAL CONTROLLER

The generator leaves the factory with the controller warning set at 105% load and shutdown set at 110% load. The
unit is equipped with a digital controller with paralleling capabilities. The paralleling feature allows the operator to
synchronize multiple controllers and distribute the load between units. Contact Generac Mobile Products Technical
Support for more information about this feature.

21

20

19

2

1

1718

16

Figure 10 - Digital Controller Pushbuttons and LEDs

3

4

1112131415

5

6

7

8

9

10

01754

1. Horn Reset: Deactivates the horn (audible alarm).

2. Mode ←: Cycles backward through genset operation modes.

3. Mode →: Cycles forward through genset operation modes.

4. Fault Reset: Acknowledges faults and alarms.

5. Start: Starts the genset in manual (MAN) mode.

6. Stop: Stops the genset in manual (MAN) mode.

7. Bus: Green LED is on if bus voltage is present and within limits.

8. GCB ON: Green LED is on if generator circuit breaker feedback is active. Flashes during synchronizing.

9. Genset Failure: Red LED starts flashing when any failure occurs. After Fault Reset button is pressed,

changes to steady light (if an alarm is still active) or is off (if no alarm is active).

35319 C MGG155/210 Operating Manual 21

General Information

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10. Gen Voltage Present: Green LED is on if generator voltage is present and within limits.

11. GCB ON (I)/OFF (O): Opens and closes (synchronizes) the generator circuit breaker in manual MAN mode.

12. MCB ON: Green LED is on if the mains circuit breaker feedback is active. Flashes during reverse synchro-

nizing (synchronizing of the loaded genset back to the restored mains).

13. MCB ON (I)/OFF (O): Opens and closes (synchronizes) the mains circuit breaker in manual MAN mode.

14. Mains Voltage Present: Green LED is on if voltage on the mains terminals is present (in SPI and SPtM).

LED is not active in MINT, COX.

15. Mains Failure: Red LED starts flashing when the mains failure occurs and genset does not run, changes to

steady light when the genset starts, and then turns off when the mains restores.

16. →: Moves history record displayed columns to the right, five percent increase of edited setpoint’s value

(step given by the setpoint range), go back from Alarm list.

17. ↓: Select the setpoint, select the screen, select history record or decrease setpoint value.

18. ←: Moves history record displayed columns to the left, five percent decrease of edited setpoint’s value (step

given by the setpoint range), view Alarm list from measurement screens.

19. ↑: Select the setpoint, select the screen, select history record or increase setpoint value.

20. Esc:

21. Enter:

Where Function

Measurement screens,
Alarm list

Setpoints screen Go to Menu screen; within setpoint group, go to group list

Setpoint edit Leave setpoint edit without changes

History screen Go to Menu screen

FastEdit screen FastEdit exit (to previous measurement screen) without changes

Language screen Language screen exit (to Menu) without save

Where Function

Menu screen Go to selected display group (Measurement CU, Measurement IO.)

Measurement screens,
Alarm list

Setpoints screen Go to selected setpoint group

Setpoint edit Start setpoint edit/save changes

History screen Go to the first column of the first history record

FastEdit screen FastEdit exit (to previous measurement screen) with setpoint change

Language screen Language screen exit (to Menu) and save selection

Go to MENU screen

Go to FastEdit screen, hold Enter button for four seconds, then it is
possible to adjust selected setpoint. (Typically Base load for standard
SPtM.)

For more detailed controller information, see the controller operator guide included with the unit.

Setting the Clock

To set the clock on the digital controller, press Esc, then select Setpoints>Date/Time>Time. Press Enter. Use the up
and down arrows to adjust the settings, then press Enter.

22 MGG155/210 Operating Manual 35319 C

Section 3 - Operation

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The operation of this unit should only be performed by an authorized operator; that is, someone who has been
properly trained by an Independent Authorized Service Dealer. Contact your local Independent Authorized Service
Dealer for assistance in training authorized operators. Read the operating manual thoroughly and understand all
instructions before operating the equipment.

The following instructions assume that the unit has been properly set up, serviced, tested, adjusted, and otherwise
prepared for use by an Independent Authorized Service Dealer. Read the safety information carefully before
attempting to operate this equipment.

PRESTART CHECKLIST

When the initial installation is complete, these checks must be performed before starting the engine. These checks
are not required before each start, only after the initial installation.

CAUTION

Do not apply high voltage to windings in moisture-saturated conditions. Serious damage to

genset and property can result. (000153)

Note: These precautions are extremely critical in locations such as seaboard installations and other high humidity
areas. Some installations will be in environments that are much more corrosive than others.

 Verify battery disconnect switch is turned ON.
 Verify unit is positioned in a stable manner.
 Verify proper clearance on all sides and top of enclosure.
 Verify unit is a safe distance from any flammable or combustible material.
 Verify no load is connected to unit.
 Inspect the engine and genset and verify there are no loose wires or components. Tighten if

necessary.

 Verify engine oil level is correct. See Check Engine Fluids.
 Verify engine coolant level is correct. See Adding Coolant.
 Verify the controller is in STOP mode by pressing the STOP button.
 Verify the fuel valve is open and the pressure and flow rate are correct.
 Remove all tools, rags, etc. from inside the unit enclosure. Close and secure all enclosure doors prior

to starting the unit.

MANUALLY STARTING THE UNIT

This unit is designed to operate on Natural Gas (NG)/well gas or LP liquid. At oil well sites, LP liquid is typically used
to start the unit until the pump jack brings the well gas (natural gas) up to the surface. The unit fuel system will detect
when there is sufficient pressure to switch to natural gas as the primary fuel source.

Natural Gas (Well Gas) Start Up

If there is sufficient pressure in the well gas fuel line (10-20 psi [69-138 kPa]), the unit can be started directly on well
gas. Follow the steps below:

1. Open the manual ball fuel valve located just inside the frame. See Fuel System (MGG155 Shown).

2. Check for fuel leaks.

3. Press the START on the digital controller. The controller will sense the type of fuel entering the system and

will display “ALI NG Fuel Select”.

Note: If the unit will not start, verify the Fuel Select switch is set to NG or AUTO. See Figure 9.

35319 C MGG155/210 Operating Manual 23

Operation

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LP Liquid Start Up

4. Open the LP liquid tank supply valve and the natural gas manual fuel valve (see Figure 6 for location). If

any leaks are detected, correct them immediately.

5. Press the START button on the digital controller.

6. When the natural gas pressure reaches 10-20 psi (69-138 kPa), move the Fuel Select switch to the NG

position. (You may have to toggle the switch between NG and LP until the unit runs smoothly on NG.)

7. Move the switch to AUTO.

Note: It will not be necessary to purge the fuel lines after shutting the unit down for maintenance or service unless
the fuel lines have been disconnected.

When the unit reaches operation speed, verify the voltage setting is correct and adjust if necessary. If the engine
fails to start, see Troubleshooting.

AUTO (REMOTE) STARTING THE UNIT

Connect the remote start contact to the remote start terminals on the terminal block (#12 and #34). Follow all NEC,
state and local regulations.

Note: The bonding plate may need to be removed. See Figure 12 for bonding plate location.

A ground connection is located next to the lugs. The generator neutral is bonded to ground when it is shipped from
the factory. The bonding plate may need to be removed if the generator is used as a standby power source.

INSTALLATION SHOULD BE IN COMPLIANCE WITH THE NATIONAL ELECTRICAL CODE (NEC), STATE AND
LOCAL REGULATIONS.

02022

Figure 11 - Terminal Block

PARALLEL SETUP AND OPERATION

The unit can be operated in parallel with other parallel-capable units. To ensure the units to be used in parallel are
appropriate for the load, contact Generac Mobile Products Technical Support at 1-800-926-9768.

Before running units in parallel, make sure each unit is operating properly. Set up auto (remote) starting on each unit.

Paralleling Two Units

Using the provided CAN parallel cable, connect one end of the cable to the terminal block of the first unit and the
other end to the terminal block of the second unit. Match each wire with the corresponding color wire connected to
the terminal block; yellow to yellow, green to green, black (shield) to black. Connect the provided 120 ohm resistor

24 MGG155/210 Operating Manual 35319 C

Operation

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to the unused terminals on both units as shown on the decal located below the terminal blocks.

Paralleling More Than Two Units

To parallel more than two units, connect another CAN parallel cable from the unused terminal on the second unit
(remove resistor, if necessary) to a terminal on the next unit. Continue chaining the parallel units. Connect the resistors
to the unused terminals on the first and last units in the series.

Once the units are set up in parallel, they will share the load evenly during normal operation. If parallel units are in
auto mode and one unit is shut down, the load will transfer to the remaining units on line. If all paralleled units are
in manual mode, press the GCB (Generator Circuit Breaker) button on the controller, and the load gradually transitions
to the other units.

Note: When one or more units shut down, any remaining units will shut down if the increase in proportional load is
greater than what the unit is rated for. Contact Generac Mobile Products Technical Support to verify the units to be
used in parallel are appropriate for the planned load.

OPERATION CHECKS

With the engine running, verify the following:

 Verify there are no fuel leaks. If a fuel leak is detected, stop the engine immediately by pressing STOP

on the controller. Repair any fuel leaks before proceeding.

 Verify there are no coolant or oil leaks. If a leak is detected, stop the engine immediately and repair the

leak before proceeding.

 Verify that operation is smooth. If belt squeals, vibrations or other sources of noise exist, stop the

engine immediately and repair before proceeding.

 Verify correct voltage (line−to−line and line−to−neutral) at the genset.
 Verify phase rotation is the same as the attached equipment.
 Minor adjustment of the output voltage is made using the voltage adjust potentiometer on the control

panel.

WARNING

DO NOT open coolant system until engine has completely cooled. Doing so could

result in serious injury. (000154)

 After the operational checks are made, stop the engine by pressing STOP on the controller, and wait

for the engine to cool. When the engine is cool, check engine oil and coolant levels.

OVERCRANK SHUTDOWN

After a pre-specified duration of cranking, this function ends cranking if the engine has failed to start. The default
settings are:

• The unit will attempt to start (crank) three times.

• Each crank cycle lasts 10-15 seconds, followed by a five second rest (to cool the starter).

• After three starting attempts, the controller alarm will sound and the LCD window on the controller will display
“Start Fail Alarm”.

35319 C MGG155/210 Operating Manual 25

Operation

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ENGINE OIL REPLENISHMENT SYSTEM

This unit is equipped with an engine oil replenishment system. The system eliminates the need for frequent filling
and checking of the crankcase. The system consists of a oil reservoir tank and an oil level regulator. The regulator
is mounted so the centerline of the sight glass is at the same height as the level of the oil in the crankcase. When
the engine oil level is low, the float will trigger the reservoir tank to send fresh oil to the crankcase. The regulator
delivers only that amount of oil required to maintain a constant oil level in the crankcase. A fine mesh screen in the
regulator provides protection against damage by contaminants and abrasive foreign matter.

The regulator is pre-set to the correct level at the factory and should not require adjustment. See Check Engine

Fluids for more information.

DERATING FOR ALTITUDE

All units are subject to derating for altitude and temperature; this will reduce the available power for operating tools
and accessories connected to the receptacles. Typical reductions in performance are a derate of -3% for every 1000
ft (305 m) above 1200 ft (366 m) above sea level and a derate of -1% per 10°F (-12ºC) increase in ambient air
temperature over 77°F (25°C).

GENERATOR OUTPUT CONNECTIONS

The unit is equipped with lug connections, located inside the customer connection box. The connection box is located
behind the door on the right side of the unit. See Figure 5. The lugs provide connection points for attachment of
external loads to the generator.

DANGER

RISK OF ELECTROCUTION. BEFORE ANY CONNECTIONS ARE MADE TO THE

GENERATOR, VERIFY THE MAIN CIRCUIT BREAKER AND THE BATTERY DISCON-

NECT SWITCH ARE OFF (O). POTENTIALLY LETHAL VOLTAGES MAY BE PRESENT

AT THE GENERATOR CONNECTION LUGS.

WARNING

Only a trained and licensed electrician should perform wiring and connections to

unit. Failure to follow proper installation requirements could result in death, serious

injury, and damage to equipment or property. (000155)

Connections to the lugs should be made by running the power cables up through the opening in the bottom of the
box. DO NOT make any connections directly to the lugs without routing the cables through the slot. Use a hex-wrench
to tighten the cable connections.

The connection box door is equipped with a safety interlock switch that will trip the main circuit breaker and disable
the voltage regulator if the door is opened while the unit is operating.

DANGER

ELECTROCUTION. DO NOT DISABLE OR MODIFY THE CONNECTION BOX DOOR

SAFETY SWITCH. DOING SO WILL RESULT IN DEATH OR SERIOUS INJURY. (000157)

A ground connection is located next to the lugs. The generator neutral is bonded to ground when it is shipped from
the factory. The bonding plate may need to be removed if the generator is used as a standby power source.

INSTALLATION SHOULD BE IN COMPLIANCE WITH THE NATIONAL ELECTRICAL CODE (NEC), STATE AND
LOCAL REGULATIONS.

26 MGG155/210 Operating Manual 35319 C

Operation

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1

Figure 12 - Generator Output Connections

1. Connections lugs 2. Bonding plate

CUSTOMER CONVENIENCE RECEPTACLES

The unit is equipped with two 120V GFCI receptacles, located to the right of the customer connection box. These
receptacles are not routed through the main circuit breaker. Each receptacle has its own circuit breaker, located
directly above it.

20A Circuit Breakers

2

00862

GFCI Receptacles

Figure 13 - 120V GFCI Receptacles

Power to the receptacles is available any time the generator is running, even if the main

circuit breaker is OFF (O). VERIFY ANY EQUIPMENT CONNECTED TO THE CONVE-
NIENCE RECEPTACLES IS TURNED OFF BEFORE TURNING THE BREAKERS ON and
the output voltage is correct for the equipment that is connected to the receptacles. Improper

voltage may cause equipment damage, property damage, or malfunction.

35319 C MGG155/210 Operating Manual 27

02021

Operation

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MAIN CIRCUIT BREAKER

When the main circuit breaker is OFF (O), power is interrupted between the bus connections and the generator.
Once connections have been made to the bus bars and the generator has been started and allowed to reach normal
operating temperature, the breaker may be switched ON (I).

The main circuit breaker will be tripped, disconnecting power to the bus connections, if any of the following conditions
occur while the unit is running:

• Overload of the generator circuits to the bus connections. At 105% load, there will be an audible warning.
At 110% load, the breaker opens and power will be disconnected.

• The customer connection box door is opened.

• The emergency stop switch is activated.

Verify any problems that cause the main circuit breaker to trip are corrected before returning the switch to ON (I).

Frame Ground Connection

Follow all NEC, state and local regulations pertaining to frame ground connections.

00659

Figure 14 - Frame Ground Connection

Determine ground stud location and connect the ground wire to the “earth ground” terminal. This ground is the local
reference ground to ground the unit frame only.

Battery Disconnect Switch

The unit is equipped with a battery disconnect switch which allows the operator to disconnect power from the batteries
by turning the switch to OFF.

SHUTTING DOWN THE UNIT

1. Verify power to the load can be interrupted. There may be other procedures that must be done before shutting
a unit down, depending on the application.

2. Open the Main Circuit Breaker (MCB) by pressing the right I/O button on the controller.

3. Allow the unit to cool down (running at no-load) for approximately five minutes to prevent damage to critical

engine components.

4. Press STOP on the controller.

5. Turn the battery disconnect switch to OFF.

28 MGG155/210 Operating Manual 35319 C

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EMERGENCY STOP SWITCH

This unit is equipped with an emergency stop switch. The switch is located on the outside of the rear enclosure panel.
See Figure 5. Activate the switch by pressing the red button in until it locks down. This will stop the engine. The
switch will remain locked until the button is pulled out.

CAUTION

Equipment Damage. The emergency stop switch is not to be used to power down the unit
under normal operating circumstances. Doing so will result in equipment damage. (000246)

TOWING THE TRAILER

Note: See Towing Safety before towing a trailer.

1. Use the jack to raise or lower the trailer onto the hitch of the towing vehicle. Lock the hitch coupling and attach
the safety chains or cables to the vehicle. Raise the jack foot completely.

2. Connect any trailer wiring to the tow vehicle. Check for proper operation of the directional and brake lights.

3. Make sure all doors are properly latched.

4. Check for proper inflation of the trailer tires. For maximum tire pressures, see Specifications.

5. Check the wheel lugs. Tighten or replace any that are loose or missing. If a

tire has been removed for axle service or replaced, tighten the lugs in the
order shown to the following specifications:

6. Start all lug nuts by hand.

a. First pass tighten to 20-25 ft-lbs (27-33 Nm).

b. Second pass tighten to 50-60 ft-lbs (67-81 Nm).

c. Third pass tighten to 90-120 ft-lbs (122-162 Nm).

Note: After the first road use, repeat tightening procedure.

1

6

8

3

4

5

7

2

00670

Figure 15 - Lug Sequence

35319 C MGG155/210 Operating Manual 29

Section 4 - Maintenance

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EMISSIONS

The United States Environmental Protection Agency (US EPA) (and California Air Resources Board (CARB), for
engines/equipment certified to California standards) requires that this engine/equipment complies with exhaust and
evaporative emissions standards. Locate the emissions compliance decal on the engine to determine applicable
standards. For emissions warranty information, please reference the included emissions warranty. It is important to
follow the maintenance specifications in the manual to ensure that the engine complies with the applicable emissions
standards for the duration of the product’s life.

MAINTENANCE TASKS

Regular maintenance will improve performance and extend engine/equipment life. Generac Mobile Products LLC
recommends that all maintenance work be performed by an Independent Authorized Service Dealer (IASD). Regular
maintenance, replacement or repair of the emissions control devices and systems may be performed by any repair
shop or person of the owner’s choosing. However, to obtain emissions control warranty service free of charge, the
work must be performed by an IASD. See the emissions warranty.

Daily checks must be performed when the unit is operated continuously for extended periods of time. Daily checks
and routine monthly checks can be performed by an authorized operator.

Normal maintenance service and replacement of parts is the responsibility of the owner and are not considered
defects in materials or workmanship within the terms of the warranty. It is strongly recommended the equipment be
periodically checked by an Independent Authorized Service Dealer.

Daily Walk Around Inspection

Look for conditions that could hinder performance or safety, such as (but not limited to) oil, coolant, gas (natural or
LP) leakage, blocked vents, loose or missing hardware and electrical connections. Check for foreign matter blocking
the vents and on top of the unit.

When the unit is not running:

• Visually inspect the fan belt for cracks, fraying and stretching. Verify the belt is properly seated in the pulley
grooves. Every 750 hours, it is recommended the belt be removed and checked for wear. While the belt is
removed, inspect pulleys and bearing. Rotate and feel for hard turning or unusual sounds.

• Coolant should be checked daily. Coolant should be visible in the sight glass located near the top of the
radiator. See Adding Coolant.

• Check electrical connectors, battery and battery disconnect switch connections, and ground points. Look
for loose or missing hardware.

• Check all flexible rubber hoses for deterioration.

Check Fuel System

Check the fuel supply pressure. At the well fuel inlet, the well gas should be a minimum of 10 psi (69 kPa) and a
maximum of 20 psi (138 kPa).

Check Engine Fluids

The following checks can be performed by a trained authorized operator. Observe all safety precautions outlined in

Safety.

Check Engine Oil Level

An authorized operator should check the engine oil level daily. The oil level should be maintained between the full
and add marks on the engine dipstick. Recommended fluids are listed in Engine Oil Recommendations.

35319 C MGG155/210 Operating Manual 31

Maintenance

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Check the level on the oil level regulator sight glass. The oil level should be about halfway up the sight glass when
the engine is running. If not, adjust the regulator height by loosening the two screws on the regulator bracket and
slowly sliding the regulator along the slots until the oil is at the proper level. Tighten the screws.

00573

Figure 16 - Oil Level Sight Glass

This unit is equipped with an auxiliary engine oil reservoir. The level in the reservoir should be checked periodically
and oil added as needed. Verify the reservoir valve is open to allow oil to drain into the oil level regulator. Close the
valve before moving the unit.

To check the engine oil using the dipstick:

1. Locate the engine oil dipstick. See Component Locations.

2. The most accurate oil level readings are measured when the engine is cold. If the engine was running, wait

at least ten minutes before proceeding.

3. Remove the dipstick and wipe it dry with a clean, lint free cloth.

4. Slowly insert the clean dipstick into the tube. Visually confirm the dipstick is fully seated in the dipstick tube.

A visual inspection is required because some dipsticks will require more effort than others to fully seat.

5. After ten seconds, remove the dipstick and look at the oil level on both sides. The lower of the two readings

will be the correct oil level measurement.

6. Add oil (if necessary) to adjust the level. After adding or changing the oil, the engine should run for one min-

ute before checking the oil level. Remember to wait ten minutes to allow the engine to cool and oil to fully
drain into the oil pan.

Typical causes of inaccurate oil level readings:

• Reading the high level of the dipstick.

• Reading the dipstick before the oil fully drains into the oil pan.

• Inserting and removing the dipstick too quickly.

• The dipstick is not fully seated in the dipstick tube.

Changing the Oil

Note: When changing oil, it is not necessary to drain the oil from the reservoir.

1. Close the valve below the oil reservoir.

2. Place a container below the oil drain port, located on the left side of the skid frame. Remove the oil drain

plug with an Allen head wrench.

3. Open the drain valve at the engine oil pan. Verify the oil level regulator valve is open.

4. Allow the oil to drain completely into the container.

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5. Remove the oil filter and discard it. Make sure the old gasket did not separate from the filter and become

stuck to the engine. If so, remove the gasket and discard it.

6. Before installing the new oil filter, lubricate the new gasket with a thin film of clean engine oil.

7. Install the new oil filter, turning one full turn after initial gasket contact.

8. Close the engine oil drain valve and reinstall the plug at the skid frame drain port.

9. Remove the oil fill cap on the engine valve cover and add fresh oil. See Specifications for oil capacities

and Engine Oil Recommendations for oil type.

10. Verify the fuel level is between the Full and Add marks on the dipstick.

11. Open the oil reservoir valve.

12. Top off the oil in the reservoir.

13. There is no need to run the unit and verify the oil level. The filter will automatically fill up with oil and the oil

switch will allow the proper amount of oil to feed the engine until full.

Adding Coolant

Visually check the coolant level in the sight glass located near the top of the radiator. If coolant is not visible, add
coolant to the system. Let engine cool (not at operating temperature, not running), before adding coolant. Add a 50/
50 mixture of the correct antifreeze and distilled or deionized water to the coolant system.

DANGER

RISK OF POISONING. DO NOT USE MOUTH TO SIPHON COOLANT. DOING SO WILL

RESULT IN DEATH OR SERIOUS INJURY. (000149)

WARNING

DO NOT open coolant system until engine has completely cooled. Doing so could

result in serious injury. (000154)

CAUTION

Wash hands thoroughly after handling coolant. Do not store used antifreeze in an open

container because animals are attracted to the smell and the taste of antifreeze even though

it is poisonous.

CAUTION

Do not use any chromate base rust inhibitor with propylene glycol base antifreeze, boosters

or additives. Doing so will cause overheating. (000165)

Integrated Electronic Pressure Regulator (IEPR) Maintenance and Inspection

If the IEPR fails to operate or develops a leak, it should be repaired or replaced with the OEM recommended
replacement parts. When inspecting the system, check for the following items:

• Check for any fuel leaks at the inlet and outlet fittings.

• Check for any fuel leaks in the IEPR body.

• Check the inlet and outlet fittings of the coolant supply lines for water leaks, if applicable.

• Verify the IEPR is securely mounted and the mounting bolts are tight.

• Check the IEPR for external damage.

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Maintenance

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• Check the IEPR electrical connection to verify the connector is seated and locked.

Checking/Draining Oil Build-Up in the Vaporizer Regulator

During the course of normal operation for LPG engines, oil or “heavy ends” may build inside the secondary chamber
of the vaporizer regulator. These oil and heavy ends may be a result of poor fuel quality, contamination of the fuel,
or regional variation of the fuel make up. A significant build up of oil can affect the performance of the secondary
diaphragm response. It is recommended the oil be drained periodically. See the Maintenance Schedule for intervals.
This is the minimum requirement to maintain the emission warranty.

We recommend the vaporizer regulator be drained at every engine oil change if contaminated or sub-standard fuel
is suspected or known to have been used. Failure to follow this recommendation may be used to deny a warranty claim.

Note: Draining the regulator when the engine is warm will help the oils to flow freely from the regulator.

To drain the regulator, follow the steps below:

1. Verify the equipment is in a well-ventilated area and no external ignition sources are present.

2. Start the engine.

3. With the engine running, close the manual valve.

4. When the engine runs out of fuel, press STOP on the controller and turn the battery disconnect switch OFF.

5. Loosen the hose clamps at the inlet and outlet hoses on the regulator and remove the hoses.

6. Remove the regulator mounting bolts.

7. Place a small receptacle in the engine compartment under the regulator.

8. Rotate the regulator 90° so the outlet fitting is pointing down into the receptacle and drain the regulator.

9. Inspect the secondary chamber of the regulator for any large dried particles and remove.

10. Rotate the regulator back to its original position and reinstall the regulator mounting bolts.

11. Remove the receptacle. Dispose of any drained material in a safe and proper manner.

12. Install the fuel hoses.

13. Connect any other hoses removed during this procedure.

14. Slowly open the manual service valve.

15. Check for leaks at the inlet and outlet fittings using a soapy solution or an electronic leak detector. If leaks

are detected, repair the leaks.

16. Check coolant line connection to verify no leaks are present.

17. Start engine.

18. Recheck for leaks at the regulator.

MAINTENANCE SCHEDULE

Periodic inspection, service, and maintenance of this unit is critical in ensuring its reliable operation. The following
is the manufacturer’s recommended maintenance schedule. The maintenance items will need to be performed more
frequently if the unit is used in severe applications (such as very high or very low ambient conditions or extremely
dirty/dusty environments). Use the unit hour meter or calendar time, whichever occurs first, from the previous
maintenance interval to determine the next required maintenance interval. Note that some checks are based on

34 MGG155/210 Operating Manual 35319 C

Maintenance

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hours of operation.

Follow all applicable safety and caution statements found in the unit operating manual or engine service/maintenance
manual before performing any maintenance checks or service.

This maintenance schedule reflects the minimum tasks that need to be accomplished to verify the unit remains
operational. Some of the tasks can be performed by an authorized operator and others must be performed by an
Independent Authorized Service Dealer.

Note: An authorized operator is one who has been trained by an Independent Authorized Service Dealer in the
proper operation and inspection of this unit.

Use the schedule in the following table as a guide for regular maintenance intervals. For additional maintenance
information, see the OEM engine manual.

Table 4 - Basic Maintenance Schedule

First

Item Daily

Walk Around Inspection 

Check Oil Level 

Check Coolant Level 

Check Belts 

Check Electrical Wiring 

Inspect Radiator for Signs of Obstruction or Damage 

Inspect Gas Piping and Hoses for Leaks and Damage 

Sample Engine Oil * 

Change Oil, Replace Oil Filters  

Inspect/Replace Crankcase Ventilation Filters  

Check All Flex Hoses  

Check and Adjust Intake and Exhaust Valve Clearance  

Inspect Coolant Hoses  

Visually Inspect Air Filter (replace if necessary)  

50 Hours
(Break In

Period)

Every

750

Hours

8000

Hours

(Annually)

Inspect Shutoff Valve for Leaks and Closing  

Check Engine Air Induction for Leaks  

Drain LPL Vaporizer Oil Build Up  

Inspect Exhaust/Catalyst  

Service Batteries 

Replace Spark Plugs 

Check Battery Connections and Disconnect Switch 

Lubricate Trailer Leveling Jacks 

Check Engine and Generator Mounts 

Drain, Flush and Refill Cooling System 

Replace Ignition Coils 

35319 C MGG155/210 Operating Manual 35

Maintenance

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* Many factors, such as environmental conditions and type of oil used, can affect how often the engine oil should be
changed. The oil should be sampled every 250 hours initially to determine if it will be necessary to change the oil
more frequently than the scheduled 750 hours.

Battery Inspection

WARNING

Explosion. Batteries emit explosive gases while charging. Keep fire and spark away.

Wear protective gear when working with batteries. Failure to do so could result in

death or serious injury. (000137a)

WARNING

Explosion. Do not dispose of batteries in a fire. Batteries are explosive. Electrolyte

solution can cause burns and blindness. If electrolyte contacts skin or eyes, flush

with water and seek immediate medical attention. (000162)

WARNING

Risk of burn. Do not open or mutilate batteries. Batteries contain electrolyte solution
which can cause burns and blindness. If electrolyte contacts skin or eyes, flush with

water and seek immediate medical attention. (000163a)

WARNING

Accidental start-up. Disconnect the negative battery cable, then the positive battery
cable when working on unit. Failure to do so could result in death or serious injury.

(000130)

WARNING

Vision loss. Eye protection is required to avoid spray from spark plug hole when

cranking engine. Failure to do so could result in vision loss. (000181)

WARNING

Environmental hazard. Always recycle batteries at an official recycling center in

accordance with all local laws and regulations. Failure to do so could result in

environmental damage, death or serious injury. (000228)

Every 750 hours, an Independent Authorized Service Dealer should inspect the battery system. At this time, the
battery condition and state of charge should be checked using a battery load tester. The batteries should be recharged
or replaced as required.

Battery service is to be performed or supervised by personnel knowledgeable of batteries and the required
precautions. Keep unauthorized personnel away from batteries.

Observe the following precautions when working on batteries:

• Turn the battery disconnect switch to OFF.

• Remove the five amp controller fuse from the control panel.

• Remove watches, rings, necklaces and other metal objects.

• Wear rubber gloves and boots.

• Do not lay tools or metal parts on top of the battery.

• Use tools with insulated handles.

• Disconnect charging source prior to connecting or disconnecting battery terminals.

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Maintenance

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• Discharge static electricity before touching battery by first touching a grounded metal surface.

• DO NOT jump start batteries.

Note: Spilled electrolyte should immediately be washed down with a bicarbonate of soda solution consisting of one
pound (500 grams) bicarbonate of soda (baking soda) to one gallon (four liters) of water for the average battery. Add
this solution to the spill until foaming has ceased. The resulting liquid can be flushed with water.

WARNING

Explosion. Batteries emit explosive gases while charging. Keep fire and spark away.

Wear protective gear when working with batteries. Failure to do so could result in

death or serious injury. (000137a)

Battery Replacement

When required, the batteries must be replaced with ones of equivalent size, voltage, and CCA (cold crank amp
capacity). See Specifications or contact an Independent Authorized Service Dealer for proper battery sizing.

Note: A new battery must be filled with the proper electrolyte and be fully charged before installing.

Preliminary Instructions

1. Turn battery disconnect switch to OFF.

2. Remove all cables from the batteries, starting with the negative (ground) cable first.

3. Dispose of batteries in accordance with local regulations.

WARNING

Environmental hazard. Always recycle batteries at an official recycling center in

accordance with all local laws and regulations. Failure to do so could result in

environmental damage, death or serious injury. (000228)

Installing the New Batteries

Connect the cables to the battery posts as follows:

1. Connect the positive battery cable (red boot) from the battery disconnect switch to the positive (POS or +)
battery post of the battery closest to the front of the unit (battery farthest from battery disconnect switch).

35319 C MGG155/210 Operating Manual 37

Maintenance

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2. Connect both batteries with a jumper cable, attaching the black booted end of the cable to the negative

(NEG or -) post of the first battery (farthest from disconnect switch), and the red booted end to the positive
(POS or +) post of the second battery.

Figure 17 - Battery Connections

3. Attach the black cable from the engine ground to the negative (NEG or -) post of the second battery.

02035

CAUTION

Do not make battery connections in reverse. Doing so will result in equipment damage.

(000167)

Final Instructions

1. Install the five amp controller fuse in the control panel.

2. Turn the battery disconnect switch to ON.

3. See Manually Starting the Unit.

Other Maintenance Checks

The following inspections should be performed by a Independent Authorized Service Dealer, or a properly trained
authorized operator. These maintenance items require a high level of experience and skill to evaluate and correct.

• Inspect engine accessory drive belts.

• Inspect hoses and connections.

• Inspect fuel supply system.

• Inspect exhaust system.

• Inspect exhaust pipe sleeve.

Note: All recommended service maintenance or repairs should be completed by an Independent Authorized Service
Dealer to maintain the warranty status of a unit.

38 MGG155/210 Operating Manual 35319 C

Maintenance

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JACK MAINTENANCE

The following procedures should be performed annually.

Side-Wind Models

• The internal gearing and bushings of the jack must be kept lubricated. Apply a small amount of automotive
grease to the internal gearing by removing the jack cover, or if equipped, use a needle nose applicator or
standard grease gun on the lubrication point found on the side of the jack near the crank. Rotate the jack
handle to distribute the grease evenly.

• A lightweight oil must be applied to the handle unit at both sides of the tube.

• If equipped, the axle bolt and nut assembly of the caster wheel must also be lubricated with the same
lightweight oil.

Top-Wind Models

• Apply a lightweight oil to the screw stem.

Oil Grease

Grease

Oil

Figure 18 - Lubrication Points

Grease

Oil

Oil

Oil

00243

TRAILER WHEEL BEARINGS

The trailer axles are equipped with a grease fitting to allow lubrication of the wheel bearings without the need to
disassemble the axle hub. To lubricate the axle bearings, remove the small rubber plug on the grease cap, attach a
standard grease gun fitting to the grease fitting and pump grease into the fitting until new grease is visible around
the nozzle of the grease gun. Use only a high quality grease made specifically for lubrication of wheel bearings. Wipe
any excess grease from the hub with a clean cloth and replace the rubber plug when finished. The minimum
recommended lubrication is every 12 months or 12,000 miles (19,312 km). More frequent lubrication may be required
under extremely dusty or damp operating conditions.

35319 C MGG155/210 Operating Manual 39

Section 5 - Troubleshooting

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Problems and Solutions

Some of the more common problems are listed in the table below. This information is intended to be a check or
verification that simple causes can be located and fixed. It does not cover all types of problems. Procedures that
require in-depth knowledge or skills (like flashing the field) should be referred to an authorized service department.

Table 5 - General Troubleshooting Guide

Problem Possible Cause Solution

Engine Cranks But Will
Not Start

Engine Will Not Crank
(Electric Start)

Engine Starts But Will
Not Run Smoothly

Engine Overheats Excessive load.

No Output Voltage Circuit breaker tripped or

High Output Voltage Excessive speed. Check engine for malfunction. Verify engine RPM.

Low Output Voltage Wrong speed. Check engine for malfunction. Verify engine RPM.

No fuel.
Low oil level.
Restricted air flow.
No spark.

Dead battery.

Emergency stop is acti­vated.

Fuel or ignition problem. See OEM engine manual. Contact Generac Mobile Products

Debris or dirt buildup on
engine/radiator.

failed.
Internal failure of alterna­tor.
Idle switch on.

Check that fuel valves are open.
Low Oil Pressure Shutdown activated. Replenish oil to full.
Check/replace air filter.
Check/replace spark plug(s).

Remove batteries and trickle charge. Never jump start. Even if
only one battery is bad, it is recommended that both batteries be
replaced at the same time.
Reset controller after an emergency stop.

Technical Support.

Remove one or more electrical loads.
Remove debris. Clean engine surfaces to allow cooling.

Reset circuit breaker or replace if required.
Check electrical connections.
Contact Generac Mobile Products Technical Support.

Turn idle switch OFF.

Check AVR adjustment.

Check AVR adjustment.

Electrical Shock When
Frame Is Touched

Mechanical Noise Internal failure of alterna-

35319 C MGG155/210 Operating Manual 41

Static charge.
Grounded armature or field
coil.

tor.
Loose flexplate.
Engine fan or belts issues.

Ground unit frame at local reference ground.
Contact service.

Contact service.

Tighten flexplate to flywheel and alternator shaft.
Contact Generac Mobile Products Technical Support.

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Problem Possible Cause Solution

Table 6 - Digital Controller Troubleshooting Guide

Controller Does Not
Power Up Even With
Correct DC Power
Applied

LCD Display Cannot Be
Viewed

Controller Cannot Be
“Reset"

No “RUN" Output Signal “Shutdown Faults" not

Overspeed Shutdown
Occurs At Normal
Speed

Voltage Or Current
Metering Is Incorrect

Wiring mistake.

Overload condition.

Improper supply voltage.
Improper contrast adjust­ment.

Engine not stopped.
Controller not in OFF
mode.

reset.
Engine speed not detected
at cranking.

Controller programmed
values are wrong or con­troller has failed.

Controller programmed
values are wrong.
Ground is missing.

Voltage sensing wiring
mistake.

Check that there are no wiring errors/short circuits connected to
the controller.
Check breaker on the control panel.
Check fuses on control panel.

Check DC supply voltage at terminals B+ and B- (10-30VDC).
Adjust LCD contrast for best display.

Verify the engine is at a complete stop before trying to reset.
Set the controller to OFF before trying to reset.

All shutdown faults must be reset (red shutdown LED must be
OFF).
Engine speed signal must be detected (speed signal green LED
on) during cranking if the “run-output fail safe" feature is enabled.
Verify correct magnetic pickup signal at cranking (2.0VAC min.
during cranking).

Verify the controller programmed values are correct for the num­ber of flywheel teeth, nominal RPM, and overspeed set point per­centage. Replace controller if failed.

Verify the controller programmed values are correct for the volt­age sensing PT ratio and/or current sensing CT ratio.
Verify that the battery supply DC negative conductor is properly
grounded to the engine block (i.e. to a common ground point).
Verify the voltage sensing wiring connection to the controller
matches power distribution type.
NOTE: Standard direct voltage connection requires that the gen­erator neutral is solidly grounded.

Engine Temperature Or
Oil Pressure Display Is
Incorrect

Engine Alarms Are On
For High Engine Tem­perature Or Low Oil
Pressure When Engine
Is Operating Properly

Keypad Buttons
(Switches) Do Not
Operate

42 MGG155/210 Operating Manual 35319 C

Failed engine sensor.

Ground is missing.

Wrong temp or pressure
calibration.

Keypad not connected to
controller.

Verify engine sensors.
NOTE: Engine sensors must be factory supplied only.
Verify that the battery supply DC negative conductor is properly
grounded to the engine block (i.e. to a common ground point).

Verify the engine mounted senders have correct resistance values
for corresponding input temperature or pressure.
Verify calibration.

Verify the interconnecting ribbon cable between the Lexan™ face­plate and main printed circuit board is correctly connected.
Replace controller if failed.

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Table 7 - Digital Controller Alarm Abbreviations

Abbreviation Description

AI Analog Input

AO Analog Output

ATS Automatic Transfer Switch (switches load to supplied bus (by mains or generators)

AVR Automatic Voltage Regulator

BI Binary Input

BO Binary Output

BOC Breaker Open Cool-down - protection type (see application manual for details)

BTB Bus-Tie Breaker

CAN1 CAN bus for ComAp extension modules (e.g. IGS-PTM) and engine ECU connection

CAN2 CAN bus for communication between controllers and communication

modules connection (e.g. I-LB+)

COX Application for Complex Systems where actions are taken by a PLC and controller only follows

orders => needs an external driver (cox)

CT Current Transformer

ECU Engine Electronic Control Unit

ESF Engine Specific File

Forward Synchroni­sation

FMI Failure Mode Identifier

GC Graphical Characters - option for additional support of one "graphical" language

GCB Generator Circuit Breaker

CHP Combined Heat Power - co-generation application, usually with gas engine

I-AOUT8 Extension module with 8 AO

I-CB Communication Bridge - interfaces IS, IG/IS-NT, ID controllers and non-standard engine ECU

IG-AVRi IG Automatic Voltage Regulator interface

IG-EE InteliGen for Electronic Engines (HW optimized for connection to an engine equipped with ECU)

IG-EEC InteliGen EE controller with extended communication possibilities + switchable sensing ranges of AC

IG-IB IG-Internet Bridge - for internet/ethernet communication

IGL-RA15 Indication panel with LEDs signalizing state of 15 BO

Synchronisation of unloaded genset to mains (GCB closing process)

voltages and currents

IG-NT InteliGen New Technology genset controller

IG-NTC InteliGen NT controller with extended communication possibilities + switchable sensing ranges of AC

voltages and currents

IGS-NT-LSM+PMS Dongle for IG-XX and IS-NT to enable Load Sharing and VAr sharing control loops and PMS

IGS-PTM Extension module with 8 BI/BO, 4 AI and 1 AO

I-LB Local Bridge – for direct and modem monitoring and control of multiple gensets

35319 C MGG155/210 Operating Manual 43

Troubleshooting

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Table 7 - Digital Controller Alarm Abbreviations

Abbreviation Description

IM-NT InteliMains New Technology - Mains supervision controller; the same controller with a different SW

configuration can work as a bus-tie synchronizer

I-RB Relay Board

IS-AIN8 Extension module with 8 AI

IS-BIN8/16 Extension module with 8 BO and 16 BI

IS-NT InteliSys New technology genset controller

IS-NT-BB InteliSys New Technology Basic Box (without display)

KWP2000 Key Word Protocol of Scania S6 unit (for engine diagnostics)

LAI Logical Analog Inputs (card in GenConfig which is used to assign source signal to controller Logical

Analog Input functions, e.g. Oil press)

LBI Logical Binary Inputs (card in GenConfig which is used to assign source signal to

controller Logical Binary Input functions, e.g. Sys Start/Stop)

LS Load Sharing - analog load sharing line to interconnect gensets on site (for island parallel or mains

parallel operation of multiple gen-sets); IG/IS/IM-NT controllers
bus

use digital Load Sharing via the CAN2

LSM Load Sharing Module

LT Option for Low Temperature modification (display equipped with heating foil)

MCB Main Circuit Breaker

MGCB Master Generator Circuit Breaker (sometimes used with multiple gensets in island parallel or mains

parallel operation)

MINT Multiple application with INTernal control loops - for multiple gensets in island

parallel or mains parallel operation; Load Sharing and VAr Sharing controlled
able

MP Mains Protection

MultlslOp Multiple Island Operation (MCB is opened, GCB’s are closed)

MultParOp Multiple Parallel Operation (MCB is closed, GCB’s are closed)

NPU Mains protection relay (voltage, frequency, vector shift protections)

OC Occurrence Count (number of fault occurrences transmitted in diagnostic frame

from ECU)

OfL Off load - protection type (see application manual for details)

PF Power Factor

PGN Parameter Group Number (see SAE J1939-71)

PMS Power Management System - ensures optimization of running gensets on sites

based on kW/kVA spinning reserve or on relative (%) load;
no-master system ensures high reliability

internally; PMS avail-

with multiple gen-sets;

Reverse synchroni­sation

RTC Real Time Clock

SG Speed Governor

SHAIN SHared (virtual) Analog INput module

44 MGG155/210 Operating Manual 35319 C

Synchronisation of loaded genset to mains (MCB closing process)

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Table 7 - Digital Controller Alarm Abbreviations

Abbreviation Description

SHAOUT SHared (virtual) Analog OUTput module

SHBIN SHared (virtual) Binary INput module

SHBOUT SHared (virtual) Binary OUTput module

Soft load Generator soft loading according to Load ramp loop setting

Soft unload Generator soft unloading according to Load ramp loop setting

SPI Single Parallel Island application - for single gensets in parallel with mains or in

island operation; suitable for CHP applications; no MCB control

SPM Single Prime Mover application - for single gensets without mains

SPN Suspect Parameter Number (see SAE J1939-71)

SPtM Single Parallel to Mains application - for single gensets in parallel with mains or in island operation,

with AMF support; both MCB and GCB controlled

SSB Single Stand-By application - for single gensets with mains and break transfer to

mains

VPIO Virtual periphery I/O module – internal “SW wires” linking binary outputs to inputs

controllers via inter-controller CAN2

VS VAr Sharing - ensures VAr sharing between gensets on site via the CAN2 bus (for island parallel or

mains parallel operation of multiple gen-sets)

VT Voltage Transformer

# Setting of setpoints (with this character in front of them) is shared between controllers controllers via

inter-controller CAN2

Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

ECU Indication of error in communication with ECU.

Check if the ECU is:

- correctly connected to the CAN1 port of the controller (see ComAp Electronic Engines
Support manual for information about ECU connection)

- powered up

- terminating resistors are properly connected

- the CAN bus Low and High wires are not swapped

SHAinCfgErr Shared Analog module configuration error – i.e. more than one source module

(SHAOUT) were configured (on the CAN2 bus). Make sure that only one SHAOUT x
module is configured in controllers.

Description

ECUDiagBlocked Alarm is active when Comms settings: ECU diag = DISABLED. This setting means that

ECU alarms are not displayed and considered by controller and this alarm is the setting
notification.

Wrong config Wrong controller configuration indication.

Indicates that controller hardware doesn't support PLC used in configuration. To check it
send the IDch and Dngl strings3 from controller Info screen 2 and archive to your techni­cal support.

35319 C MGG155/210 Operating Manual 45

Troubleshooting

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Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

RTCbatteryFlat This warning message "RTCbatteryFlat" appears in Alarmlist when battery is close to be

completely flat.
If power supply cut comes when the RTC battery is flat, the statistic values, history and
setpoints settings are lost. Send a controller to your distributor for battery exchange if the
RTCbatteryFlat message is displayed.

Al/Hist. msg 1-165 Al/Hist. msg 1-16 activity indication (Al/Hist. msg means Alarm/History message). Al/

Hist. msg can be used as a customized message for additional protection configured to
any controller internal value. See GenConfig manual - Protections.

Batt volt Indication of battery voltage protection activity. This protection is based on Analog pro-

tect: Batt >V, Batt <V, and Batt volt del setpoints. Check if engine alternator or indepen-
dent battery charger works properly.

EarthFaultCurr Indication of Earth fault current protection activity. This protection is based on Gener

protect: EarthFaultCurr and EthFltCurr del setpoints. Setpoint EarthFltCurrCT from
Basic settings group of setpoints is related to this protection too.

Gen V unbal Generator voltage unbalance alarm is based on Gener protect: Gen V unbal and Gen V

unb del setpoints. The voltage unbalance is calculated as a maximum difference

between phase voltages.

Description

Gen I unbal Generator voltage unbalance alarm is based on Gener protect: Gen V unbal and Gen V

unb del setpoints. The voltage unbalance is calculated as a maximum difference

between phase voltages.

BusL I unbal Left bus current asymmetry (unbalance) alarm is based on Gener protect: BusL I unbal

and BusL I unb del setpoints. The current unbalance is calculated as a maximum differ­ence between phase currents.

Mains V unbal Mains voltage unbalance alarm is based on Mains protect: Mains V unbal and MainsV

unb del setpoints. The voltage unbalance is calculated as a maximum difference
between phase voltages.

Mains I unbal Mains current asymmetry (unbalance) alarm is based on Mains protect: Mains I unbal

and Mains Iunb del setpoints. The current unbalance is calculated as a maximum differ­ence between phase currents.

Bus V unbal Bus voltage unbalance alarm is based on Gener protect (Bus protect): Bus V unbal

and Bus V unb del setpoints. The voltage unbalance is calculated as a maximum differ­ence between phase voltages.

BusL V unbal Left bus voltage unbalance alarm is based on BusL protect: BusL V unbal and BusL V

unb del setpoints. The voltage unbalance is calculated as a maximum difference
between phase voltages.

BusR V unbal

Dongle incomp Incompatible (usually missing) dongle indication.

Right bus voltage unbalance alarm is based on BusR protect: BusR V unbal and BusR
V unb del setpoints. The voltage unbalance is calculated as a maximum difference
between phase voltages.

IGS-NT-LSM+PMS dongle (green one) is required if load sharing and power manage­ment functions are used in MINT, COX or COMBI application.
Check a Reference Guide for information whether a dongle is required for requested
functionality or not.

Emergency stop Emergency stop activity indication. Check binary input with Emergency stop function.

46 MGG155/210 Operating Manual 35319 C

Troubleshooting

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Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

CAN2 bus empty This alarm is active if controller doesn’t “see” any other controllers on the CAN2 bus.

Alarm activation can be enabled/disabled using setpoint Comm settings: CAN2empt­Detect. This setpoint should be set to DISABLED for single genset applications.
Check Reg16/Reg32 strings to see which controllers are in the same group18.

ChrgAlternFail Charger fail detection. This alarm means that voltage on the D+ terminal is lower than

80% of controller power supply voltage and it means that battery is no longer charged.
Check function of engine alternator or independent battery charger.

Sd Stop fail Engine stop fail indication. Stop fail means that engine does not reach “still engine” state

within Engine params: Stop time.
“Still engine” conditions:

- Engine speed (RPM) = 0 and

- AI: Oil press < Starting POil and

- D+ terminal is not active and

- BI: RunIndication 1 and 2 and 3 are not active and

- Generator voltage < 15V (in all phases) and

- Generator frequency = 0 Hz

- if all these conditions are fulfilled, additional two second delay is used to confirm “still
engine” state.

Description

Overspeed Genset over speed alarm is based on Engine protect: Overspeed setpoint setting.

Underspeed Genset under speed alarm indication. Under speed limit is given by Engine params:

Starting RPM, if the engine has already started (see Starting procedure description in
Reference Guide).

Pickup fail Pickup fail indication. Pickup fail means loss of RPM signal in running state (“engine run-

ning” state is active).
“Engine running” conditions:

- Engine speed > Engine params: Starting RPM or

- AI: Oil press > Starting POil or

- D+ terminal active (this condition is used only if Engine
params: D+ function = ENABLED) or

- BI: RunIndication 1 or 2 or 3 is active or

- Generator voltage > 15V (in any phase)
See Speed pick-up input section in the Technical data chapter in IGS-NT-x.y.-Installation
Guide manual for information about requested pick-up signal parameters.

Sd BatteryFlat Alarm is activated if controller “wakes up” after a start attempt which caused battery volt-

age drop (voltage drop below 6V) and consequently controller switch-off. ComAp I-LBA
module may help to solve this problem, for information about this module, see IGS-NT­x.y.-Installation Guide manual.

WrnServiceTime This alarm is activated when at least one of controller count down service timers Engine

protect: Service time X has reached zero. It is necessary to set again a non-zero value
to a corresponding setpoint to reset this alarm.

Not lubricated This Alarm list message is active until the first lubrication cycle has been finished.

See Engine states chapter in IGS-NT-x.y-Reference Guide.

Start fail This alarm is issued if genset start-up fails. It means that several crank attempts has

been done (number of attempts is given by Engine params: Crank attempts) and engine
did not start.
For more information, see Engine starting procedures chapter in IGS-NT-x.y-Reference
Guide.

35319 C MGG155/210 Operating Manual 47

Troubleshooting

Discount-Equipment.com

Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

Start blocking This message means that a binary input with Startblocking function is active and engine

start is blocked. If active, NotReady state is shown on the controller screen and the mes­sage appears in the Alarm list. As soon as input is deactivated, engine start is enabled
again.

Wrn CylTemp1-32 Warning protection on AI Cylinder temperature 1-32 is active. Check corresponding set-

points in the Engine protect group.

Wrn MCB fail MCB failure was detected.

See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT­x.y-Reference Guide.

Stp GCB fail GCB failure was detected.

See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT­x.y-Reference Guide.

Wrn BTB fail BTB failure was detected.

See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT­x.y-Reference Guide. It applies to BTB breaker too.

Description

Wrn MGCB fail MGCB failure was detected.

See Circuit breakers operation sequence, GCB/MCB fail detection chapter in IGS-NT­x.y-Reference Guide. It applies to MGCB breaker too.

Sd Oil press B Engine shut-down was activated by binary input with “Oil press” function (see LBI card in

GenConfig for information about source signal for this function).

Wrn RSync fail Reverse synchronization failure indication, genset or group of gensets was not synchro-

nized to mains within Sync/Load ctrl: Sync timeout time.
Check setting of setpoints in the Sync/Load ctrl and Volt/PF ctrl groups. Frequency
regulation loop, Angle regulation loop and Voltage regulation loop are active during syn­chronisation and you may need to adjust their setting.
Actual state of synchronization is visible on the controller measurement screen with syn­chroscope where speed and voltage regulator's outputs, slip frequency and generator
and mains voltages can be observed during the synchronization process.

Stp Sync fail Synchronization failure indication (alarm Sync timeout is active), genset or group of gen-

sets was not synchronized to mains/bus within Sync/Load ctrl: Sync timeout time.
Check setting of setpoints in the Sync/Load ctrl and Volt/PF ctrl groups. Frequency
regulation loop, Angle regulation loop and Voltage regulation loop are active during syn­chronisation and you may need to adjust their setting.
Actual state of synchronization is visible on the controller measurement screen with syn­chroscope where speed and voltage regulators' outputs, slip frequency and generator
and mains/bus voltages can be observed during the synchronization process.

Wrn Sync fail Synchronization failure indication (alarm Sync timeout is active), genset or group of gen-

sets was not synchronized to mains/bus within Sync/Load ctrl: Sync timeout time.
Check setting of setpoints in the Sync/Load ctrl and Volt/PF ctrl groups. Frequency
regulation loop, Angle regulation loop and Voltage regulation loop are active during syn­chronisation and you may need to adjust their setting.
Actual state of synchronization is visible on the controller measurement screen with syn­chroscope where speed and voltage regulators' outputs, slip frequency and generator
and mains/bus voltages can be observed during the synchronization process.

BOC L1, L2 or L3 under Generator L1, L2 or L3 voltage was under the Gen <V BOC limit for Gen V del time.

Undervoltage protections are based on Gener protect: Gen <V BOC and Gen V del set­points. This alarm is issued if voltage protections are based on phase to neutral voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-NEUTRAL.

48 MGG155/210 Operating Manual 35319 C

Troubleshooting

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Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

BOC L1, L2 or L3 over Generator L1, L2 or L3 voltage was over the Gen >V BOC limit for Gen V del time. Over-

voltage protections are based on Gener protect: Gen >V BOC and Gen V del setpoints.
This alarm is issued if voltage protections are based on phase to neutral voltages. It
means that Basic settings: FixVoltProtSel is set to PHASE-NEUTRAL.

Sd L1, L2 or L3 over Generator L1, L2 or L3 voltage was over the Gen >V SD limit for Gen V del time. Over-

voltage protections are based on Gener protect: Gen >V SD and Gen V del setpoints.
This alarm is issued if voltage protections are based on phase to neutral voltages. It
means that Basic settings: FixVoltProtSel is set to PHASE-NEUTRAL.

BOC L12, L23 or L31 under Generator L12, L23 or L31 voltage was under the Gen <V BOC limit for Gen V del time.

Undervoltage protections are based on Gener protect: Gen <V BOC and Gen V del set­points. This alarm is issued if voltage protections are based on phase to phase voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-PHASE.

BOC L12, L23 or L31 over Generator L12, L23 or L31 voltage was over the Gen >V BOC limit for Gen V del time.

Overvoltage protections are based on Gener protect: Gen >V BOC and Gen V del set­points. This alarm is issued if voltage protections are based on phase to phase voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-PHASE.

Description

Sd L12, L23 or L31 over Generator L12, L23 or L31 voltage was over the Gen >V SD limit for Gen V del time.

Overvoltage protections are based on Gener protect: Gen >V SD and Gen V del set­points. This alarm is issued if voltage protections are based on phase to phase voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-PHASE.

BOC fgen under Generator frequency was under the Gen <f limit for Gen f del time. Under frequency pro-

tection is based on Gener protect: Gen <f and Gen f del setpoints.

BOC fgen over Generator frequency was over the Gen >f limit for Gen f del time. Over frequency protec-

tion is based on Gener protect: Gen <f and Gen f del setpoints.

BOC ReversePwr This alarm is issued by the reverse power protection. This protection is based on Gener

protect: Reverse power and ReversePwr del setpoints. This alarm means that either
engine speed/power control does not work properly or generator current transformers
(CT’s) are connected in a wrong way.

MP L1, L2 or L3 under Mains L1, L2 or L3 voltage was under the Mains <V MP limit for Mains V del time. Under-

voltage protections are based on Mains protect: Mains <V MP and Mains V del set­points. This alarm is issued if voltage protections are based on phase to neutral voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-NEUTRAL.

MP L1, L2 or L3 over Mains L1, L2 or L3 voltage was over the Mains >V MP limit for Mains V del time. Over-

voltage protections are based on Mains protect: Mains >V MP and Mains V del set­points. This alarm is issued if voltage protections are based on phase to neutral voltages.
It means that Basic settings: FixVoltProtSel is set to PHASE-NEUTRAL.

MP L12, L23 or L31 under Mains L12, L23 or L31 voltage was under the Mains <V MP limit for Mains V del time.

Undervoltage protections are based on Mains protect: Mains <V MP and Mains V del
setpoints. This alarm is issued if voltage protections are based on phase to phase volt­ages. It means that Basic settings: FixVoltProtSel is set to PHASE-PHASE.

MP L12, L23 or L31 over Mains L12, L23 or L31 voltage was over the Mains >V MP limit for Mains V del time.

Overvoltage protections are based on Mains protect: Mains >V MP and Mains V del
setpoints. This alarm is issued if voltage protections are based on phase to phase volt­ages. It means that Basic settings: FixVoltProtSel is set to PHASE-PHASE.

35319 C MGG155/210 Operating Manual 49

Troubleshooting

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Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

Mains Avg x >V If the value of 10 min. average mains voltage of any phase (Mains Avg V1, Mains Avg

V2, Mains Avg V3) exceed value given by setpoint Mains Avg >V MP (Mains protect

group), the MCB is opened and message Mains Avg x >V appears in alarm list and his­tory record. BO Common MP is activated (x indicates number of phase).

MP fmns under Mains frequency was under the Mains <f limit for Mains f del time. Under frequency pro-

tection is based on Mains protect: Mains <f and Mains f del setpoints.

MP fmns over Mains frequency was over the Mains >f limit for Mains f del time. Over frequency protec-

tion is based on Mains protect: Mains >f and Mains f del setpoints.

Bus meas error Bus measurement error is issued if bus voltage is out of limits. For details, see descrip-

tion of the Gener protect: BusMeasError setpoint in IGS-NT-x.y-Reference Guide.

OfL StartBlck This alarm indicates wrong setpoints setting that disables engine start or load takeover.

Incorrect combination of ProcessControl: Island enable; ParallelEnable; Synchro
enable; MF start enable setpoints setting is the reason why this alarm is issued.
See AUT mode section of the OFF-MAN-AUT mode chapter in IGS-NT-x.y-Reference
Guide for SPTM, SPI or COMBI application.

Description

StartBlck This alarm indicates wrong setpoints setting that disables start of gensets. Incorrect

combination of ProcessControl: Island enable; ParallelEnable; Synchro enable; MF
start enablesetpoints setting is the reason why this alarm is issued.
See OFF-MAN-AUT mode chapter in IM-NT-MCB-MGCB Reference Guide.

BOC IDMT Indicates current IDMT protection activation. Current IDMT protection is inverse definite

minimum time protection which is based on the generator current. Protection reaction
time depends on overcurrent value. High overcurrent means short reaction time whereas
low overcurrent means longer reaction time. Protection is based on setpoints Generator
protect: 2Inom del and Basic settings: Nomin current.

MPR Imains IDMT Indicates current IDMT protection activation. Current IDMT protection is inverse definite

minimum time protection which is based on the mains current. Protection reaction time
depends on overcurrent value. High overcurrent means short reaction time whereas low
overcurrent means longer reaction time.
This protection is active if the Mns2Inom prot setpoint is set to ENABLED. Protection is
based on setpoints Mains protect: Mains2Inom del and Basic settings: Nomin current.

BOR IbusL IDMT Indicates current IDMT protection activation. Current IDMT protection is inverse definite

minimum time protection which is based on the left bus current. Protection reaction time
depends on overcurrent value. High overcurrent means short reaction time whereas low
overcurrent means longer reaction time.
This protection is active if the BusL2Inom prot setpoint is set to ENABLED. Protection is
based on setpoints BusL protect

BOC ShortCurr Generator short current protection was activated. Generator current was over Generator

protect: Ishort level for Ishort del. time.

: BusL2Inom del and Basic settings: Nomin current.

BOC Overload Indicates overload IDMT protection activation. Overload IDMT protection is inverse defi-

nite minimum time protection which is based on the generator power. Protection reaction
time depends on generator power value. High generator overload means short reaction
time whereas low generator overload means longer reaction time. Protection is based on
setpoints Generator protect: OverldStrtEval and 2POverldStEvDel.

50 MGG155/210 Operating Manual 35319 C

Troubleshooting

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Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

MPR Pmains IDMT Indicates overload IDMT protection activation. Overload IDMT protection is inverse defi-

nite minimum time protection which is based on the mains power. Protection reaction
time depends on mains power value. High mains overload means short reaction time
whereas low mains overload means longer reaction time.
This protection is active if the Mns2POvrldProt setpoint is set to ENABLED. Protection is
based on setpoints Mains protect: OverldStrtEval and 2POverldStEvDel.

BOR PbusL IDMT Indicates overload IDMT protection activation. Overload IDMT protection is inverse defi-

nite minimum time protection which is based on the left bus power. Protection reaction
time depends on the left bus power value. High left bus overload means short reaction
time whereas low left bus overload means longer reaction time.
This protection is active if the BusL2POvrldProt setpoint is set to ENABLED. Protection
is based on setpoints BusL protect: OverldStrtEval and 2POverldStEvDel.

BOC NCB fail NCB fail is detected if the NeutralCB fdb input doesn't follow Neutral CB C/O output

within 400 ms.

Wrn BadPwrCfg Power format is set differently in controllers which are part of the same control group.

Check Power formats setting in GenConfig on the Miscellaneous card (available in the
Advanced mode only).

Description

WrnTstOnLdFail This alarm is issued if the Test on load function is activated (by closing corresponding BI)

and genset is not able to take over mains load completely (mains import = 0) within the
Sync/Load ctrl: Load ramp time. Message “WrnTstOnLdFail” is recorded into controller
history in case of this failure. It is either necessary to extend the Load ramp time or check
engine speed regulation.

Wrn SpdRegLim This alarm indicates that controller Speed governor output has reached its limit. Warning

is issued if Speed governor output stays close to one of the limit values for more than two
seconds. Close to one of the limits means that Speed governor output value is within
SpeedGovLowLim+0,2V range or SpeedGovHiLim-0,2V range.
This alarm gives you information that engine speed governor is either connected in a
wrong way or one of the speed control related regulation loops6 is set in a wrong way.
Warning is blocked if binary output functions SPEED up and SPEED down are config­ured.
Refer also to Sync/load control.

Wrn VoltRegLim This alarm indicates that controller AVRi output has reached its limit. Warning is issued if

the AVRi output stays close to 0% or 100% limit for more than two seconds. Close to limit
means that AVRi output value is either <2% or >98%.
This alarm gives you information that generator voltage regulator is either connected in a
wrong way or one of the voltage control related regulation loops is set in wrong way.
Warning is blocked if binary output functions AVR up or AVR down are configured.
Refer also to Volt/PF control adjustment chapter in an IGS-NT-x.y-Reference Guide.

G L neg8 Generator phase is inverted. Check generator phases connection, one of generator

phases is connected the other way round (swap generator coil leads connection).

G ph+L neg8 Wrong generator phases sequence, additionally one phase is inverted.

G ph opposed8 Wrong generator phases sequence.

M L neg9 Mains phase is inverted. Check mains transformer phases connection, one of trans-

former phases is connected the other way round (swap transformer coil leads connec­tion).

M ph+L neg9 Wrong mains phases sequence, additionally one phase is inverted.

35319 C MGG155/210 Operating Manual 51

Troubleshooting

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Table 8 - Digital Controller List of Alarms

NT

Alarm/History

Record

M ph opposed9 Wrong mains phases sequence.

B L neg13 Bus phase is inverted.

B ph+L neg13 Wrong bus phases sequence, additionally one phase is inverted.

B ph opposed13 Wrong bus phases sequence.

BL L neg12 Left bus phase is inverted.

BL ph+L neg12 Wrong left bus phases sequence, additionally one phase is inverted.

BL ph opposed Wrong left bus phases sequence.

BR L neg Right bus phase is inverted.

BR ph+L neg Wrong right bus phases sequence, additionally one phase is inverted.

BR ph opposed Wrong right bus phases sequence.

Description

ActCallCH1Fail, CH2Fail, CH3­Fail

PassInsertBlck The break through password function can be ENABLED/DISABLED from the password

Indication of unsuccessful active call 1-3.
See Inteli Communication Guide for information about active calls. See the IGS-NT-x.y­Reference Guide for description of setpoints which are part of the Act.calls/SMS group
and are used for active call setup.

management window in InteliMonitor (initial status is DISABLED).
Warning “PassInsertBlck” appears in the alarm list when the controller is blocked. The
operator is not allowed to insert the password if the controller is blocked. The screen will
display information that the controller is blocked and the time remaining until the end of
the block. The controller is locked for five minutes when the password is wrongly entered
six times (in case of next six wrong attempts [correct password was not inserted at all] for
30, 60, 120, 240 minutes). An Incorrect password message will appear in the history of
the controller stating when the invalid password was used.

52 MGG155/210 Operating Manual 35319 C

Section 6 - Wiring Diagrams

Discount-Equipment.com

AC WIRING - MGG155 (120V GCB)

ROTATING RECTIFIER

210

211

3 X 480V MAX

GENERATOR

VOLTAGE

GENERATOR

CURRENT

0 - 5 A

EXCITER ROTOR

K2

L1

L1

L2

L2

L3

L3

N

N

C1

L1K

C1-O

L1I

C2

L2K

C2-O

L2I

C3

L3K

C3-O

L3I

P4

P3K1 P2 XXX

MX341(UL)
VOLTA GE

REGULATOR

L1

L2

L3

N

C1

C1-O

C2

C2-O

C3

C3-O

P.M. ROTOR

N

S

P.M. STATOR EXCITER STATOR

TO DC WIRING

INTELIGEN NT

GENERATOR

MAIN ROTOR

MAIN STATOR

W1

W2

W5

W6

V1

SEE LINK BOARD CONNECTION

V2

V5

V6

U1

U2

U5

U6

7

8

LINK BOARD CONNECTIONS

SERIES STAR 3PH 4W

W2

W5

V2

7

V5

U2

8

L1A

U5

VOLTAGE: 480/277
OUTPUT TERMINALS

U, V, W, N

N

W

V

U

W6

V6

N

U6

W1

L3

V1

L2

U1

L1

SEE LINK BOARD CONNECTION

63

23

TB1

L1

L2

L3

N

C1

C1-O

C2

C2-O

C3

C3-O

1K OHM

31

TB2

VOLTAGE

2

ADJUSTING
RHEOSTAT

A1

12

A2

S1

S2

L1

L1

L1

L2

CT1

CT2

3/O AWG*

62

L1 L2 L3 N

L1A

L1A

10 AWG

N

10 AWG

N

L3

N

H1 H3

L3

X2 X1

N

300

300

CT3

3/O AWG*

3/O AWG*

CBCR

CBOR

9 5

G12 AWG

L1

L3

TRANSFORMER

59

150 VA

300

302

303

TO CUSTOMER CONVENIENCE
RECEPTACLES

TO DC WIRING

TB2

301301

300

302

303

CIRCUIT BREAKER
MOTOR OPERATOR
B4 A1

A2-CLOSE

A4-OPEN

301

301300

MAINLINE

CIRCUIT BREAKER

NEUTRAL/GROUND

BOND

L1 L3L2

L1M

L1 L3L2 NGND

L2M

L3M

3/O AWG*

3/O AWG*

3 PHASE 4 WIRE

NMNM

3/O AWG*

3/O AWG*

BUS BAR

*BREAKER REQUIRES A

MINIMUM OF 3/O AWG

90527_A_08.25.14

L1M

L1

MAINS (BUS)

VOLTAGE

L2M

3 X 480V

L2

L3M

L3

NM

N

ALL CONTROL WIRING IS 16AWG UNLESS OTHERWISE NOTED.
DASHED LINES INDICATE CUSTOMER CONNECTIONS.

1LM L1M

L2M L2M

L3M L3M

NM

IN CONTROL PANEL

4 AWG

35319 C MGG155/210 Operating Manual 53

Wiring Diagrams

Discount-Equipment.com

AC WIRING - MGG210 (120V GCB)

ROTATING RECTIFIER

GENERATOR

INTELIGEN NT

3 X 480V MAX

VOLTAGE

CURRENT

0 - 5 A

210

211

GENERATOR

GENERATOR

EXCITER ROTOR

K2

L1

L2

L3

N

L1K

L1I

L2K

L2I

L3K

L3I

P.M. ROTOR

N

S

P.M. STATOR EXCITER STATOR

TO DC WIRING

MAIN ROTOR

MAIN STATOR

W1

W2

W5

W6

V1

SEE LINK BOARD CONNECTION

V2

V5

V6

U1

U2

U5

U6

7

8

LINK BOARD CONNECTIONS

SERIES STAR 3PH 4W

VOLTAGE: 480/277

OUTPUT TERMINALS

U, V, W, N

W2

W5

V2

7

V5

U2

8

L1A

U5

N

W6

V6

N

U6

W

W1

L3

V

V1

L2

U

U1

L1

SEE LINK BOARD CONNECTION

63

P4

P3K1 P2 XXX

L1

L2

L3

N

C1

C1-O

C2

C2-O

C3

C3-O

MX341(UL)
VOLTAGE

REGULATOR

L1

L2

L3

N

C1

C1-O

C2

C2-O

C3

C3-O

23

TB1

L1

L2

L3

N

C1

C1-O

C2

C2-O

C3

C3-O

1K OHM

31

TB2

VOLTA GE

2

ADJUSTING
RHEOSTAT

A1

12

A2

S1

S2

L1

L1

L1

L2

CT1

CT2

4/O AWG

62

L1 L2 L3 N

L1A

L1A

10 AWG

N

10 AWG

N

L3

N

H1 H3

L3

X2 X1

N

300

300

CT3

4/O AWG

4/O AWG

CBCR

CBOR

9 5

G12 AWG

L1

L3

TB2

TRANSFORMER

59

150 VA

300

302

303

TO CUSTOMER CONVENIENCE
RECEPTACLES

TO DC WIRING

TB2

301301

300

302

303

CIRCUIT BREAKER
MOTOR OPERATOR
B4 A1

A2-CLOSE

A4-OPEN

301

301300

MAINLINE

CIRCUIT BREAKER

BOND

L1M

L1 L3L2

L1 L3L2 NGND

L2M

L3M

4/O AWG

4/O AWG

3 PHASE 4 WIRE

NMNM

4/O AWG

4/O AWG

BUS BAR

90519_C_08.25.14

L1M

L1

MAINS (BUS)

VOLTAGE

L2M

3 X 480V

L2

L3M

L3

NM

N

ALL CONTROL WIRING IS 16AWG UNLESS OTHERWISE NOTED.
DASHED LINES INDICATE CUSTOMER CONNECTIONS.

1LM L1M

L2M L2M

L3M L3M

NM

IN CONTROL PANEL

2 AWG

NEUTRAL/GROUND

54 MGG155/210 Operating Manual 35319 C

AC WIRING - MGG155 (24V GCB)

Discount-Equipment.com

Wiring Diagrams

35319 C MGG155/210 Operating Manual 55

Wiring Diagrams

Discount-Equipment.com

AC WIRING - MGG210 (24V GCB)

56 MGG155/210 Operating Manual 35319 C

Wiring Diagrams

Discount-Equipment.com

DC WIRING - MGG155 (120V GCB)

CAN HIGH

204

203

H

CAN 1

FORCE KW TO

STARTER

ECU PWR

RELAY

COMMON

SHUTDOWN

GCB ON COIL

GCB OFF COIL

HORN

LCL

SHUTDOWN

BREAKER

FEEDBACK

E-STOP

DONGLE

REMOTE

START

YELLOW

AVRI COM

AVRI

AVRI OUT

CAN 2

CONTROL BOX WIRING

12 AWG

20 AWG

20 AWG

4D

4D

12

37

90

PANE L

MOUNTED

E-STOP

1A 1B

1A

iG-AVRI

214

AVRI -

215

AVRI +

34

216

218

217

CAN LOW

205

L

COM

BI5

BI3

BI2

BI4

BI1

GREEN

-

220

H

L

L1

L2

OUT1

OCOM

TB2

12 AWG

1

1

2

2

11

11

204

204

205

205

203

203

12

12E 12E 12E 12E 12E 12E

12

12E

12E

12

11

210

211

212

AC1

213

AC2

12

216

218

217

12

12

12F

12E

12F

12E

18V

480V

212

iG-AVRI

TRANS

0V 0V

L3

213

1

2

11

204

20 AWG

205

20 AWG

203

12 AWG

12

FSS

3

FS

2

1
6

5

220

4

12F

12E 12E

37

4

11

68

90 90

12 12

1B

12

210

211

L1

12

34

216

218

217

216

218

217

DC BREAKER

15 AMP

4

4

4

PANE L
LIGHT

FUSE

F1

10A

4C 4D

4

F2
5A

4

4F

F3
5A

4

4A

4 4

4

1

SR

2

5

9

FR

11

59

PL

4C

COM

4F

INTELIGEN NT

+

NATURAL GAS 100KW

108 FOR PROPANE

SR

13

14

2A

4A

4A

4A

4A

4A

4A

BO1

FR

13

14

11A

BO2

STR

1314

68A

BO3

CBCR

1314

231

BO4

CBOR

1314

232

BO5

HORN

13

BO6

STR

4

68

59

NOT ON ALL UNITS

IGS.NT.LSM+PMS

ENGINE/OPTIONAL ACCESSORY WIRING

CPIC

12 AWG 1

1

B

2

A

11

C

204

M

205

N

203

P

12

E

FS

12F

W

X

37

T

BATTERY

DISCONNECT

SWITCH

2/O AWG

20 AWG

20 AWG

NG LOCK 1

222

222

223

223

12E

WHT BLK

LP LOCK 1

B

LCLS

BLU

RED

24VDC BATTERY SYSTEM

+ - + -

2/O AWG

SM

YELLOW

GREEN

12 AWG

GRN

221 221

ABLK 221

223

12F

12-4

FPS

NCCOM

12F

BLK

S

TB2

DOOR

SWITCH

11

11

68

1B

12

210

211

TB3

12

34

216

218

217

216

218

217

NORMALLY CLOSED

HELD OPEN

ST

68

WHITE

1B 12

BLACK

68

68

AUX

EXTERNAL

MOUNTED

E-STOP

41

CIRCUIT BREAKER AUX CONTACT
SHOWN IN THE OPEN POSITION

IN CUSTOMER

CONNECTION PANEL

TB4

12

12

34

34

216

216

218

218

217

217

216

216

218

218

217

217

Legend

CPIC - CONTROL PANEL INTERFACE

12

EIC

112

M

2

F

11

A

204

N

205

P

12

SJ

FS

HK

D

222

B

223RED

C

12

12

210

211

L1

L3

REMOTE
AUTOSTART
CONTACT

216

218

217

216

218

217

CONNECTOR 21 PIN

EIC - ENGINE INTERFACE CONNECTOR

SM - STARTER MOTOR

PL - PANEL LIGHT SWITCH

L1 - PANEL LIGHT 1

L2 - PANEL LIGHT 2

FSS - FUEL SELECT SWITCH

FS - FUEL SELECT
OPEN=NG, CONNECTED=LP

24V LOCKOFF POWER

NG LOCK - LOCKOFF (NATURAL GAS)

LP LOCK - LOCKOFF (PROPANE)

SR - STARTER RELAY

FR - FUEL SOLENOID RELAY

STR - SHUNT TRIP RELAY

CBCR - CIRCUIT BREAKER

CLOSED RELAY

CBOR - CIRCUIT BREAKER

OPEN RELAY

FPS - FUEL PRESSURE SWITCH

LCLS - LOW COOLANT

LEVEL SWITCH

ST - SHUNT TRIP

ALL WIRE IS 16 AWG UNLESS NOTED.

DASHED LINES INDICATE CUSTOMER
CONNECTIONS.

TO AC WIRING

TO CAN COMMUNICATION
CONNECTION

90526_ORG_06.17.14

35319 C MGG155/210 Operating Manual 57

Wiring Diagrams

Discount-Equipment.com

DC WIRING - MGG210 (120V GCB)

CONTROL BOX WIRING

DC BREAKER

15 AMP

4

4

4

PANE L

LIGHT
FUSE

F1

10A

4

4C 4D

F2
5A

4

4F

F3
5A

4

4A

4 4

4

1

SR

2

5

9

FR

11

59

YELLOW

GREEN

PL

4C

4F

SR

13

14

2A

4A

FR

13

14

4A

11A

STR

1314

4A

68A

CBCR

1314

4A

231

CBOR

1314

4A

232

HORN

13

4A

STR

4

68

59

203

COM

H

CAN 1

INTELIGEN NT

+

NATURAL GAS 137KW

FORCE KW TO

139 FOR PROPANE

BO1

STARTER

ECU PWR

BO2

RELAY

COMMON

BO3

SHUTDOWN

BO4

GCB ON COIL

BO5

GCB OFF COIL

BO6

HORN

LCL

SHUTDOWN

BREAKER

FEEDBACK

CAN HIGH

204

CAN LOW

205

L

-

220

BI2

BI4

BI5

NOT ON ALL UNITS

BI3

E-STOP

DONGLE

IGS.NT.LSM+PMS

AVRI COM

AVRI

AVRI OUT

REMOTE

BI1

START

H

CAN 2

COM

L

12 AWG

20 AWG

20 AWG

4D

4D

12

37

90

214

215

34

216

218

217

PANE L

MOUNTED

E-STOP

1A1A 1B

iG-AVRI

AVRI -

AVRI +

L1

L2

OUT1

OCOM

AC1

AC2

12

12E 12E 12E 12E 12E 12E

12

12E

12E

12

11

210

211

212

213

12

216

218

217

TB2

1

1

2

2

11

11

204

204

205

205

203

203

12

12

FSS

3

12F

12E

1
6

12F

12E

4

18V

480V

iG-AVRI

TRANS

0V 0V

L1

L3

212

213

12 AWG

20 AWG

20 AWG

12 AWG

2

5

220

CPIC

1

B

2

A

11

C

204

M

205

N

203

P

12

E

FS

12F

W

12E 12E

X

37

T

4

S

TB2

11

68

90 90

12 12

1B

12

210

211

TB3

12

34

216

218

217

216

218

217

ENGINE/OPTIONAL ACCESSORY WIRING

24VDC BATTERY SYSTEM

BATTERY

DISCONNECT

SWITCH

12 AWG 1

1

2

11

20 AWG

204

20 AWG

205

203

12

2/O AWG

2/O AWG

SM

12 AWG

+ - + -

112

2

11

YELLOW

204

GREEN

205

EIC

M

F

A

N

P

SJ

FS

12F

37

11

11

NORMALLY CLOSED

68

68

1B

WHITE

12

BLACK

210

211

12

34

216

218

217

216

218

217

NG LOCK 1

222

222

223

223

12E

DOOR

SWITCH

HELD OPEN

ST

WHT BLK

LP LOCK 1

B

FPS

NCCOM

LCLS

BLU

RED

68

68

AUX

41

EXTERNAL
MOUNTED

E-STOP

1B 12

GRN

ABLK 221

12-4

BLK

IN CUSTOMER

CONNECTION PANEL

12

34

216

218

217

216

218

217

FS

HK

221 221

D

222

B

223RED

C

223

12F

12F

CIRCUIT BREAKER AUX CONTACT
SHOWN IN THE OPEN POSITION

TB4

12

34

216

216

218

218

217

217

216

216

218

218

217

217

12

12

12

12

210

211

L1

L3

REMOTE
AUTOSTART
CONTACT

Legend

CPIC - CONTROL PANEL INTERFACE

CONNECTOR 21 PIN

EIC - ENGINE INTERFACE CONNECTOR

SM - STARTER MOTOR

PL - PANEL LIGHT SWITCH

L1 - PANEL LIGHT 1

L2 - PANEL LIGHT 2

FSS - FUEL SELECT SWITCH

FS - FUEL SELECT
OPEN=NG, CONNECTED=LP

24V LOCKOFF POWER

NG LOCK - LOCKOFF (NATURAL GAS)

LP LOCK - LOCKOFF (PROPANE)

SR - STARTER RELAY

FR - FUEL SOLENOID RELAY

STR - SHUNT TRIP RELAY

CBCR - CIRCUIT BREAKER

CLOSED RELAY

CBOR - CIRCUIT BREAKER

OPEN RELAY

FPS - FUEL PRESSURE SWITCH

LCLS - LOW COOLANT

LEVEL SWITCH

ST - SHUNT TRIP

ALL WIRE IS 16 AWG UNLESS NOTED.

DASHED LINES INDICATE CUSTOMER
CONNECTIONS.

TO AC WIRING

TO CAN COMMUNICATION
CONNECTION

90516_ORG_05.09.14

58 MGG155/210 Operating Manual 35319 C

DC WIRING - MGG155 (24V GCB)

Discount-Equipment.com

Wiring Diagrams

Legend

CPIC - CONTROL PANEL INTERFACE

CONNECTOR 21 PIN

EIC - ENGINE INTERFACE CONNECTOR

SM - STARTER MOTOR

PL - PANEL LIGHT SWITCH

L1 - PANEL LIGHT 1

L2 - PANEL LIGHT 2

FSS - FUEL SELECT SWITCH

FS - FUEL SELECT
OPEN=NG, CONNECTED=LP

24V LOCKOFF POWER

NG LOCK - LOCKOFF (NATURAL GAS)

LP LOCK - LOCKOFF (PROPANE)

SR - STARTER RELAY

FR - FUEL SOLENOID RELAY

STR - SHUNT TRIP RELAY

CBCR - CIRCUIT BREAKER

CLOSED RELAY

CBOR - CIRCUIT BREAKER

OPEN RELAY

FPS - FUEL PRESSURE SWITCH

LCLS - LOW COOLANT

LEVEL SWITCH

ST - SHUNT TRIP

ALL WIRE IS 16 AWG UNLESS NOTED.

DASHED LINES INDICATE CUSTOMER
CONNECTIONS.

35319 C MGG155/210 Operating Manual 59

Wiring Diagrams

Discount-Equipment.com

DC WIRING - MGG210 (24V GCB)

Legend

CPIC - CONTROL PANEL INTERFACE

CONNECTOR 21 PIN

EIC - ENGINE INTERFACE CONNECTOR

SM - STARTER MOTOR

PL - PANEL LIGHT SWITCH

L1 - PANEL LIGHT 1

L2 - PANEL LIGHT 2

FSS - FUEL SELECT SWITCH

FS - FUEL SELECT
OPEN=NG, CONNECTED=LP

24V LOCKOFF POWER

NG LOCK - LOCKOFF (NATURAL GAS)

LP LOCK - LOCKOFF (PROPANE)

SR - STARTER RELAY

FR - FUEL SOLENOID RELAY

STR - SHUNT TRIP RELAY

CBCR - CIRCUIT BREAKER

CLOSED RELAY

CBOR - CIRCUIT BREAKER

OPEN RELAY

FPS - FUEL PRESSURE SWITCH

LCLS - LOW COOLANT

LEVEL SWITCH

ST - SHUNT TRIP

ALL WIRE IS 16 AWG UNLESS NOTED.

DASHED LINES INDICATE CUSTOMER
CONNECTIONS.

60 MGG155/210 Operating Manual 35319 C

CUSTOMER CONVENIENCE RECEPTACLES - MGG155 AND MGG210

Discount-Equipment.com

500 VA BUCK

TO LINK BOARD CONNECTIONS

10 AWG

L1A

TRANSFORMER

X3

X1

12 AWG

L1B

X4

X2

Wiring Diagrams

10 AWG

N

G

G

H4

H2

NN12 AWG

NN

H3

H1

12 AWG

12 AWG

L1B12 AWG

B1 B2

R1

120V

20A 20A

G

12 AWG L1B

12 AWG L1C

B

WG

12 AWG L1B

B1 - RECEPTACLE

20A BREAKER 1

B2 - RECEPTACLE

12 AWG L1C

20A BREAKER 2

B

R2

120V

G

R1 - GFI RECEPTACLE 1

R2 - GFI RECEPTACLE 2

WG

90535_A_08.25.14

CAN PARALLEL COMMUNICATION CONNECTION - MGG155 AND MGG210

FIRST GENERATOR MIDDLE GENERATORS LAST GENERATOR

CAN INCAN OUT

HLHCOML HCOML HCOML HCOML HL

216

218

217

120 OHM 120 OHM

CAN INCAN OUT CAN INCAN OUT

216

218

217

216

218

217

216

218

217

SINGLE GENERATOR

CAN INCAN OUT

HLHL

120 OHM

120 OHM

90534_ORG_06.13.14

35319 C MGG155/210 Operating Manual 61

Service Log

Discount-Equipment.com

OIL GRADE: _____________________________________ BRAND: __________________________________

COOLANT MIXTURE: _____________________________ BRAND: __________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

__________________________________________________________________________________________

Date

Hours to

Service

Oil Level

Coolant

Level

Date

Hours to

Service

Oil Level

Coolant

Level

63

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