Lincoln Electric LN-9F GMA, LN-9 GMA Circuit Protection and Automatic Shutdown, Circuit bREAKER

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OPERATION

CIRCUIT bREAKER AND GROUNDING LEAD PRO- TECTOR (GLP) RESET SWITCH: These protection circuit devices are located on the front rail of the LN-9 GMA model and bottom panel of the LN-9F models. See the topic "Circuit Protection and Automatic Shutdown" later in this section of the manual.

DIGITAL METER: A three-digit digital meter is provid- ed to set and monitor the welding procedure. The arc voltage is displayed in volts and the wire feed speed is displayed in inches/minute or meters/minute.

METER READING SWITCH, VOLTS AND WIRE SPEED CONTROLS: This four-position rotary switch is located to the right of the digital meter on LN-9 GMA models and to the left of the digital meter on LN-9F models. When set to the "Volts" position, the meter reads the arc voltage setting as adjusted by the "Volts" control. The rated setting range for all the LN-9 GMA models is 12.0 to 60.0 volts.

The three "Wire Speed" positions include an English position, for meter readings in inches/minute; and "LO" and "HI" range metric positions for meter readings in meters/minute. The wire feed speed setting is adjust- ed by the "Wire Speed" control. The rated setting range for all the LN-9 GMA models are 80 to 980 inch- es/minute (2.03 to 24.9 meters/minute).

When using metric meter readings, set the switch to "LO" for more precise meter readings up to 393 in/min (9.99 m/min.). For higher wire feed speeds, the "LO" position will result in an over-range meter reading of

E.EEwhich indicates that the "HI" range, with single decimal place resolution, should be used. Similarly, EEE will be displayed on the English position if the set- ting exceeds 999 inches/minute.

The procedure adjustments can be made before or during the weld. This feature permits the operator to set the welding voltage and wire speed before welding and without assistance.

Once set, the control circuits of the LN-9 GMA will con- tinuously monitor the volts and wire speed and correct any deviation from the set value so there will be negli- gible change.

Should the range of the power source output voltage be such that the unit circuit cannot keep the arc voltage as set, the unit will stop welding shortly after the arc is struck. See the topic "Circuit Protection and Automatic Shutdown" later in this section of the manual.

SET-ACTUAL PUSHbUTTON: After the weld has been started, the ACTUAL voltage or wire speed can be read by pressing the pushbutton to the left of the meter. The METER READING switch must be set in the desired position. When the pushbutton is not being operated, the meter continues to read the SET value.

CIRCUIT PROTECTION AND AUTOMATIC SHUTDOWN

CIRCUIT bREAKER

The circuit breaker normally trips only when excessive loading in the wire feed cable or a defective motor or control component causes an overload. After allowing a minute for cooling, push in the circuit breaker button and weld. If it trips again, be sure the wire feed cable is clean and the proper size for the wire diameter being fed. If the breaker still trips, look for a defective elec- trical component. When the circuit breaker is tripped, the digital meter is off and the trigger circuit will not operate.

POWER SUPPLY FUSE

The fuse on the PM power board inside the control box protects the power supply circuit. When the fuse is blown, the digital meter is off and the trigger circuit will not operate.

VOLTAGE PC bOARD FUSE

The 1/8 amp fast-blow fuse protects the LN-9 GMA cir- cuitry from damage that may result from a ground, or case, faulted control lead. If this fuse blows, the LN-9 GMA arc voltage sensing lead circuit will be opened. See the topic "Automatic Shutdown" below.

AVOIDING GROUNDING LEAD PROTECTOR (GLP) SHUTDOWN

The frames of all LN-9 GMA wire feed units and drive motors are grounded to the frame of the power source by a lead in the control cable. An overload protector prevents welding current from damaging this lead if the electrode circuit touches the wire feeder frame while the gun trigger is pressed.

LN-9 GMA and LN-9F GMA Wire Feeder

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Contents LN-9 GMA and LN-9F GMA Wire Feeder Safety Depends on YouSafety Electric Shock can kill Welding and Cutting Sparks can Cause fire or explosion IiiPrécautions DE Sûreté Thank You TAbLE of Contents TAbLE OF CONTENTS cont’d Section F ViiiSection E P127, P125, P107 & P289 SeriesTechnical Specifications LN-9 GMA and LN-9F GMA Wire FeederWidth Height Mounting the Wire Feed Unit Installing the LN-9 GMA Roll and 4-ROLL ModelsAttaching the Wire Reel Stand Mounting the UnitPower Input CAbLE ASSEMbLY Electrical Connections LN-9 GMA and LN-9F GMARouting the Electrode Figure A.2 Strain Relief Clamp Figure A.3 LN-9F GMA Control bOXInstallation Can kill Figure A.5 Connection of LN-9 GMA to DC-600 Power Sources Figure A.6 Connection of LN-9 GMA to DC-1000 Power Sources 75 76 77 Installation Figure A.9 Connection of LN-9 GMA to V300 Power Sources Machine Grounding Direct Work Lead ConnectionConnecting the GUN CAbLE to the Wire Feeder For GMA GUN CAbLESHooking UP GMA Shielding GAS Cylinder may explode if damagedSafety Precautions Operating InstructionsK424 LN-9 GMA 2-ROLL and K568-1 LN-9 GMA 4-ROLL General DescriptionRecommended Processes and Equipment K436 LN-9F GMA 2-ROLL and K583-1 LN-9F GMA 4-ROLLDC Constant Voltage Power Sources Controls and Settings Operation Operation Avoiding Grounding Lead Protector GLP Shutdown Power Supply FuseCircuit Protection and Automatic Shutdown Circuit bREAKERAutomatic Shutdown Drive Roll Installation Changing Drive Rolls for 2-ROLL Wire FeedersGuide Tube Detail Changing Drive Rolls for 4-ROLL Wire Feeders Large Wire Loading Figure b.7a Threaded Locking CollarLoading a 50-60 Lb .7-27.2 KG. Coil Using K1504-1 Coil Reel Feeding Electrode and bRAKE AdjustmentADJUSTAbLE Wire Reel bRAKE Loading a 50 or 60 Lb. CoilLoading and Feeding 13-14 Lb Innershield Coils K378 Reel Mounting StandIdle Roll Pressure Setting Roll Wire FeedersFor TWO-ROLL Feeders Pressure Adjustment Knob Pulse Power 500, DC650 PRO CV-400, CV-500-I Adjust the Power SourceAdjust the LN-9 GMA Controls DC-250, DC-400, or DC-600Voltage Control Response Starting CharacteristicsRUN-IN Feature Select AccelerationProcedure AT END of Coil Security of Weld Procedure SettingsMaking a Weld Wire Reel Stands and Mountings Optional Equipment and AccessoriesPower Input CAbLE ASSEMbLIES K196, K595, K596 Auxiliary Equipment ContactsSpindle for READI-REELS and 2 I.D. Spools K162-H Attaching the Wire Reel StandsWire Reel Door KIT READI-REEL AdaptersUniversal Wire Reel Stand K1524-1 Wire Feeder Accessories BURNbACK Timer KIT K419Dual Procedure KIT K319 GMA Timer KIT K418Dual Process KIT K317 For Wire Feeders Pulse Power Filter Conversion KIT K442-1Continuous Flux Feed Tank K320 Swivel Platform K178-1Undercarriage K163 K320 Flux Tank LoadingK58 Magnetic Separator Cored Electrode TAbLE C.2 Drive Roll and Guide TUbE KitsKit Roll Solid Steel Electrode Aluminum ElectrodeCoils with 1 Spindle Routine MaintenancePeriodic Maintenance AdapterProper Speed Sensor Module Mounting Figure D.1 Speed Sensor Module LocationFigure D.2 LN-9 GMA Connectors Figure D.2 Switch RequirementsTROUbLESHOOTING TROUbLESHOOTING Guide Wire Feeding PRObLEMSGun trigger will not feed wire. Digital meter is not lit Grounding Lead Protector Shutdown in the Operation section TROUbLESHOOTING Welding PRObLEMS Starting Characteristics LN-9 GMA WIRING WireLN-9F GMA LN-9 GMA Dimension Print LN-9F GMA Dimension Print 1 Wire Drive Unit LN-9F Dimension Print 2 Control bOXPage Precaucion LN-9 GMA Wire Feeder Keep your head out of fumes
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