Cummins Onan Generator & Control DFFA DFFB DFGA DFGB DFGC DFJA DFJB DFJC DFJD Complete Workshop Service Repair Manual

Caution: This document contains mixed page sizes (8.5 x 11 or 11 x 17), which may affect printing. Please adjust your printer settings according to the size of each page you wish to print. Redistribution or publication of this document by any means, is strictly prohibited.

Digital Paralleling GenSet Model DFAA, DFAB, DFAC, DFBC, DFBD, DFBE, DFBF, DFCB, DFCC, DFCE, DFEB, DFEC, DFED, DFFA, DFFB, DFGA, DFGB, DFGC, DFJA, DFJB, DFJC, DFJD, DFLA, DFLB, DFLC, DFLD, DFLE, DFMB, DQAA, DQAB, DQBA, DQBB Printed in U.S.A. 900-0519D 04-2005 Operation/Service Manual with PowerCommand  Control PCC3100 Redistribution or publication of this document by any means, is strictly prohibited.

i Table of Contents SECTION TITLE PAGE SAFETY PRECAUTIONS iii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTRODUCTION About this Manual 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Equipment 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How To Obtain Service 1-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . System Overview 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generator Set Control Function 1-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CONTROL OPERATION 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Considerations 2-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sequence of Operation 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PCC Power On/Standby Mode 2-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front Panel 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Menu Display and Switches 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Menu 2-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Menu 2-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gen Menu 2-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 CIRCUIT BOARDS AND MODULES General 3-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital Board (A32) 3-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Interface Board (A31) 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analog Board (A33) 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital Display Board (A35) 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Customer Interface Board (A34) 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PT/CT Board (A36) 3-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bus PT Board (A39) 3-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Genset Communications Module (A41) 3-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Voltage Regulator Output Module (A37) 3-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . Governor Output Module (A38) 3-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Master First Start Sensor 3-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 TROUBLESHOOTING General 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Safety Considerations 4-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Indicators 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Resetting the Control 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Warning and Shutdown Codes 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PCC Oil Pressure Warning and Shutdown Limits 4-12 . . . . . . . . . . . . . . . . . . . Troubleshooting Procedure 4-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PCC Fuses 4-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Load Sharing Controls Troubleshooting Procedure 4-57 . . . . . . . . . . . . . . . . . . Redistribution or publication of this document by any means, is strictly prohibited.

ii SECTION TITLE PAGE 5 CONTROL SERVICE AND CALIBRATION General 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Board Removal/Replacement 5-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initial Start Setup Menu 5-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjust Menu 5-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setup and Calibration Menus 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calibration Procedure 5-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Accessory Box Control Components 5-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Engine Sensors 5-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Magnetic Speed Pickup Unit (MPU) Installation 5-46 . . . . . . . . . . . . . . . . . . . . . Current Transformer (CT) Installation 5-47 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 SERVICING THE GENERATOR Testing the Generator 6-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generator/PCC Control Isolation Procedure 6-2 . . . . . . . . . . . . . . . . . . . . . . . . . Insulation Resistance (Megger) & Polarization Index (PI) Testing 6-3 . . . . . . . Drying the Windings 6-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exciter Stator 6-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Exciter Rectifier Bridge (Rotating Rectifier Assembly) 6-7 . . . . . . . . . . . . . . . . Exciter Rotor 6-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Rotor (Generator Field) 6-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Main Stator 6-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test the PMG 6-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bearing Inspection/Removal/Replacement 6-13 . . . . . . . . . . . . . . . . . . . . . . . . . Generator Disassembly 6-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generator Reassembly 6-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aligning Generator with Engine 6-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DAY TANK FUEL TRANSFER PUMP AND CONTROL Operation 7-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wiring Connections 7-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel Transfer Pump Motor Connections 7-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testing the Float Switch Assembly 7-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 INITIAL SYSTEM STARTUP General 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Startup Process 8-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Application Review 8-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Individual Generator Set Startup 8-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual System Operation 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic System Operation 8-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black Start Testing 8-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test Reports and Acceptance 8-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . On Site Power System Application Review (Diesel/600VAC and Lower) 8-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 WIRING DIAGRAMS General 9-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Redistribution or publication of this document by any means, is strictly prohibited.

LS-15M iii IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS - This manual contains important instructions that should be followed during installation and maintenance of the generator and batteries. Before operating the generator set (genset), read the Operator’s Manual and become familiar with it and the equipment. Safe and efficient operation can be achieved only if the equipment is properly operated and maintained. Many accidents are caused by failure to follow fundamental rules and precautions. The following symbols, found throughout this manual, alert you to potentially dangerous conditions to the operator, service personnel, or the equipment. This symbol warns of immediate hazards which will result in severe personal injury or death. WARNING This symbol refers to a hazard or un- safe practice which can result in severe personal injury or death. CAUTION This symbol refers to a hazard or un- safe practice which can result in personal injury or product or property damage. FUEL AND FUMES ARE FLAMMABLE Fire, explosion, and personal injury or death can result from improper practices. • DO NOT fill fuel tanks while engine is running, unless tanks are outside the engine compartment. Fuel contact with hot engine or exhaust is a potential fire hazard. • DO NOT permit any flame, cigarette, pilot light, spark, arcing equipment, or other ignition source near the generator set or fuel tank. • Fuel lines must be adequately secured and free of leaks. Fuel connection at the engine should be made with an approved flexible line. Do not use zinc coated or copper fuel lines with diesel fuel. • Be sure all fuel supplies have a positive shutoff valve. • Be sure battery area has been well-ventilated prior to servicing near it. Lead-acid batteries emit a highly explosive hydrogen gas that can be ignited by arcing, sparking, smoking, etc. EXHAUST GASES ARE DEADLY • Provide an adequate exhaust system to properly expel discharged gases away from enclosed or sheltered areas and areas where individuals are likely to congregate. Visually and audibly inspect the exhaust daily for leaks per the maintenance schedule. Make sure that exhaust manifolds are secured and not warped. Do not use exhaust gases to heat a compartment. • Be sure the unit is well ventilated. • Engine exhaust and some of its constituents are known to the state of California to cause cancer, birth defects, and other reproductive harm. MOVING PARTS CAN CAUSE SEVERE PERSONAL INJURY OR DEATH • Keep your hands, clothing, and jewelry away from moving parts. • Before starting work on the generator set, disconnect battery charger from its AC source, then disconnect starting batteries, negative (-) cable first. This will prevent accidental starting. • Make sure that fasteners on the generator set are secure. Tighten supports and clamps, keep guards in position over fans, drive belts, etc. • Do not wear loose clothing or jewelry in the vicinity of moving parts, or while working on electrical equipment. Loose clothing and jewelry can become caught in moving parts. • If adjustment must be made while the unit is running, use extreme caution around hot manifolds, moving parts, etc. DO NOT OPERATE IN FLAMMABLE AND EXPLOSIVE ENVIRONMENTS Flammable vapor can cause an engine to overspeed and become difficult to stop, resulting in possible fire, explosion, severe personal injury and death. Do not operate a genset where a flammable vapor environment can be created by fuel spill, leak, etc., unless the genset is equipped with an automatic safety device to block the air intake and stop the engine. The owners and operators of the genset are solely responsible for operating the genset safely. Contact your authorized Cummins Power Generation distributor for more information. Redistribution or publication of this document by any means, is strictly prohibited.

iv ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH • Remove electric power before removing protective shields or touching electrical equipment. Use rub- ber insulative mats placed on dry wood platforms over floors that are metal or concrete when around electrical equipment. Do not wear damp clothing (particularly wet shoes) or allow skin surface to be damp when handling electrical equipment. Do not wear jewelry. Jewelry can short out electrical con- tacts and cause shock or burning. • Use extreme caution when working on electrical components. High voltages can cause injury or death. DO NOT tamper with interlocks. • Follow all applicable state and local electrical codes. Have all electrical installations performed by a qualified licensed electrician. Tag and lock open switches to avoid accidental closure. • DO NOT CONNECT GENERATOR SET DI- RECTLY TO ANY BUILDING ELECTRICAL SYS- TEM. Hazardous voltages can flow from the generator set into the utility line. This creates a potential for electrocution or property damage. Connect only through an approved isolation switch or an approved paralleling device. MEDIUM VOLTAGE GENERATOR SETS (601V to 15kV) • Medium voltage acts differently than low voltage. Special equipment and training is required to work on or around medium voltage equipment. Operation and maintenance must be done only by persons trained and qualified to work on such devices. Im- proper use or procedures will result in severe personal injury or death. • Do not work on energized equipment. Unauthorized personnel must not be permitted near energized equipment. Due to the nature of medium voltage electrical equipment, induced voltage remains even after the equipment is disconnected from the power source. Plan the time for maintenance with authorized personnel so that the equipment can be de-energized and safely grounded. GENERAL SAFETY PRECAUTIONS • Coolants under pressure have a higher boiling point than water. DO NOT open a radiator or heat ex- changer pressure cap while the engine is running. To prevent severe scalding, let engine cool down before removing coolant pressure cap. Turn cap slowly, and do not open it fully until the pressure has been relieved. • Used engine oils have been identified by some state or federal agencies as causing cancer or reproductive toxicity. When checking or changing engine oil, take care not to ingest, breathe the fumes, or contact used oil. • Keep multi-class ABC fire extinguishers handy. Class A fires involve ordinary combustible materials such as wood and cloth; Class B fires, combustible and flammable liquid fuels and gaseous fuels; Class C fires, live electrical equipment. (ref. NFPA No. 10). • Make sure that rags are not left on or near the generator set. • Make sure generator set is mounted in a manner to prevent combustible materials from accumulating under or near the unit. • Remove all unnecessary grease and oil from the unit. Accumulated grease and oil can cause over- heating and engine damage which present a potential fire hazard. • Keep the generator set and the surrounding area clean and free from obstructions. Remove any de- bris from the set and keep the floor clean and dry. • Do not work on this equipment when mentally or physically fatigued, or after consuming any alcohol or drug that makes the operation of equipment un- safe. • Substances in exhaust gases have been identified by some state or federal agencies as causing cancer or reproductive toxicity. Take care not to breath or ingest or come into contact with exhaust gases. • Do not store any flammable liquids, such as fuel, cleaners, oil, etc., near the generator set. A fire or explosion could result. • Wear hearing protection when going near an operating generator set. • To prevent serious burns, avoid contact with hot metal parts such as radiator system, turbo charger system and exhaust system. KEEP THIS MANUAL NEAR THE GENSET FOR EASY REFERENCE Redistribution or publication of this document by any means, is strictly prohibited.

1-1 1. Introduction ABOUT THIS MANUAL This manual provides troubleshooting and repair information regarding the PowerCommand  Control 3100 (PCC) and generators for the generator set (genset) models listed on the front cover. Engine service instructions are in the applicable engine service manual. Operating and maintenance instructions are in the applicable Operator’s Manual. This manual does not have instructions for servicing printed circuit board assemblies. After determining that a printed circuit board assembly is faulty, replace it. Do not repair it. Attempts to repair a printed circuit board can lead to costly damage to the equipment. This manual contains basic (generic) wiring diagrams and schematics that are included to help in troubleshooting. Service personnel must use the actual wiring diagram and schematic shipped with each unit. The wiring diagrams and schematics that are maintained with the unit should be updated when modifications are made to the unit. Read Safety Precautions and carefully observe all instructions and precautions in this manual. TEST EQUIPMENT To perform the test procedures in this manual, the following test equipment must be available • True RMS meter for accurate measurement of small AC and DC voltages. Fluke models 87 or 8060A are good choices. • Grounding wrist strap to prevent circuit board damage due to electrostatic discharge (ESD). • Battery Hydrometer • Jumper Leads • Tachometer or Frequency Meter • Wheatstone Bridge or Digital Ohmmeter • Variac • Load Test Panel • Megger or Insulation Resistance Meter • PCC Service Tool Kit (Harness Tool and Sen- sor Tool) HOW TO OBTAIN SERVICE Always give the complete Model, Specification and Serial number of the generator set as shown on the nameplate when seeking additional service information or replacement parts. The nameplate is located on the side of the generator output box. WARNING Incorrect service or replacement of parts can result in severe personal injury or death, and/or equipment damage. Service personnel must be trained and experienced to perform electrical and mechanical service. Read and follow Safety Precautions, on pages iii and iv. Copyright  2001 Cummins Power Generation. All rights reserved. Cummins and PowerCommand are registered trademarks of Cummins Inc. Redistribution or publication of this document by any means, is strictly prohibited.

1-2 SYSTEM OVERVIEW The PCC is a microprocessor-based control for Cummins generator sets. It provides fuel control and engine speed governing, main alternator voltage output regulation, and complete generator set control and monitoring. It also provides controls for automatic and semi-automatic synchronizing and automatic load sharing controls for both isolated bus or utility (mains) paralleling applications. The operating software provides control of the generator set and its performance characteristics, and displays performance information on a digital display panel. It accepts menu-driven control and setup input from the push button switches on the front panel. GENERATOR SET CONTROL FUNCTION Figure1-1 shows some of the control functions. A more complete block diagram is provided in Section 3. A system schematic is provided in Section 9. The PCC monitors frequency from both the magnetic pick-up (MPU) and the main stator inputs. The control sends a low power pulse-width modulated (PWM) signal to the governor output module, which then sends an amplified signal to the engine fuel control. The Bus PT module reduces the bus voltage to approximately 18 VAC and provides a signal to the control for reference in synchronizing the generator set to the system bus. The external PT/CT module reduces generator voltage to approximately 18 VAC, and produces a representative AC voltage from CT output current. The voltage regulation function sends a low power PWM signal to the voltage regulator output module, which then sends an amplified signal to the exciter stator. Oil, coolant, and exhaust temperatures are sensed by variable resistance element sensors. Oil pressure is sensed by a capacitive element active sensor. Sensors Governor Output Output MPU N S PMG Battery BT1 Fuel Control Bus PT Module • • • Regulator Load To • • • 1 1 2 3 4 2 3 4 FIGURE 1-1. GENERATOR SET CONTROL FUNCTIONS Redistribution or publication of this document by any means, is strictly prohibited.

2-1 2. Control Operation GENERAL The following describes the function and operation of the PowerCommand generator set control. All indicators, displays, meters and control switches are located on the face of the control panel as illustrated in Figure 2-1. The PCC control cabinet must be opened only by technically qualified personnel. Normally, generator set configuration options are set at the factory. When a new control is installed on a generator set or when parts are replaced, the control must be configured for that generator set with the use of the “Initial Start Setup” portion of the inter- nal software. Setup and calibration procedures are described in Section 5. The automatic voltage regulator (AVR) and gover- nor operation characteristic adjustments are also described in Section 5. SAFETY CONSIDERATIONS AC power is present when the set is running. Do not open the generator output box while the set is running. WARNING Contacting high voltage components can cause electrocution, resulting in severe personal injury or death. Do not open the generator output box while the set is running. Read and observe all WARNINGS and CAU- TIONS in your generator set manuals. CAUTION The PCC control cabinet must be opened only by technically qualified personnel. Lower level voltages (18 VAC to 24 VDC) are present in PCC control cabinet. These voltages can cause electrical shock, resulting in personal injury. Even with power removed, improper handling of components can cause electrostatic discharge and damage to circuit components. Redistribution or publication of this document by any means, is strictly prohibited.

2-2 SEQUENCE OF OPERATION When the PowerCommand control is in the AUTO mode, it will cause the generator set to start on receiving a signal from a remote device. The Power- Command control will initiate a starter cranking signal and verify that the engine is rotating. The Power- Command control will provide sufficient fuel to the engine to accelerate to start disconnect speed. On reaching that speed, the control will ramp the generator set to rated speed and voltage. On reaching rated speed and voltage, the Power- Command control checks the system bus voltage. If no bus voltage is present, it will wait for a pulse from a remote Master First Start Sensor. On receiving that pulse, the control will signal the paralleling breaker to close. If bus voltage is present, the PowerCommand control will check for proper phase rotation, adjust the generator set to the bus voltage and frequency level, and then synchronize the generator set to the system bus. When a synchronous condition is achieved, the control will send a signal to close the paralleling breaker. When the paralleling breaker is closed, the generator set will assume it’s proportional share of the total load on the system bus. PCC POWER ON / STANDBY MODE Standby Mode In the Standby (sleep) mode (selector switch S5 on the Digital Board is set to the right and the generator set is not running), the control’s operating software is inactive and the LEDs and displays on front panel are all off. The operating software is initialized and the front panel is turned on in response to a run signal or any one of eight “wake up” inputs from remote sensing switches. The wake up signals are: • Emergency Stop • Low Coolant Level • Low Coolant Temperature • Low Fuel • Customer Fault Inputs 2 and 3 • Run Selected on Run/Off/Auto Switch • Remote Start Signal in Auto Mode • Self Test switch To activate and view the menu displays, press and release the Self Test switch. The PCC will initialize the operating software and permit operation of the menu display panel. If no menu selections are made, the power to the control panel will shut down after 30 seconds. Power On Mode In the Power On (awake) mode (selector switch S5 on the Digital Board is set to the left), the PCC will initialize the operating software and permit operation of the menu display panel. (See Figure 3-1 for S5 location.) Power will stay on until switch (S5) is set to the Standby mode. It is recommended that switch S5 be left in the Power On mode in all applications, except those where auxiliary battery charging is not available. CAUTION Electrostatic discharge will damage circuit boards. Always wear a grounding wrist strap when touching or handling circuit boards or socket-mounted ICs and when disconnect- ing or connecting harness connectors. Redistribution or publication of this document by any means, is strictly prohibited.

Cummins Onan Generator & Control DFFA DFFB DFGA DFGB DFGC DFJA DFJB DFJC DFJD Complete Workshop Service Repair Manual

You're Reading a Preview

Recently Viewed