Lincoln Electric 7FH manual Procedure for Replacing PC Boards Electric Shock can kill

Page 36

Procedure for Replacing PC Boards

WARNING

ELECTRIC SHOCK can kill.

•Have a qualified individual install and service this equipment.

•Turn the power source input power off at the disconnect switch before working on this equipment.

•Do not touch electrically hot parts.

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Before replacing a PC board which is suspected of being defective, visually inspect the PC board in question for any electrical or mechanical damage to any of its components and conductors on the back of the board.

a. If there is no visible damage to the PC board, install a new one and see if this remedies the problem. If the problem is remedied, reinstall the old PC board to see if the problem still exists. If it does no longer exist with old PC board:

1.Check the PC board harness connector pins for corrosion, contamination, or looseness.

2.Check leads in the plug harness for loose or intermittent connection.

b.If PC board is visibly damaged electrically, before possibly subjecting the new PC board to the same cause of failure, check for possible shorts, opens, or grounds caused by:

1.Frayed or pinched lead insulation.

2.Poor lead termination, such as a poor contact or a short to adjacent connection or surface.

3.Shorted or open motor leads, or other external leads.

4.Foreign matter or interference behind the PC boards.

c.If PC board is visibly damaged mechanically, inspect for cause, then remedy before installing a replacement PC board.

If there is damage to the PC board or if replacing PC board corrects problem, return it to the local Lincoln Electric Field Service Shop.

Gun Cable Connector Requirements to Permit Proper Connection to Wire Feed Units

Connector for 1/16 - 5/64” (1.6 - 2.0 mm) Wire

Connector for .023 - .052” (19.0 / 18.9 mm) Wire (For all other dimensions, See Diagram above).

NOTE: Connector part with .749/.747 (19.0/18,9 mm) diameter should be made from brass if it is to be part of the welding current carrying circuit.

 

“A” Diameter Hole

 

to be Concentric to

Wire Size

.749/.747 (19.0/18.9 mm)

in. (mm)

Diameter Within .008 (.20) F.I.M.

 

 

 

 

.068- 5/64

.125 [1/8 (3.2 mm) Drill]

(1.7-2.0)

 

 

 

1/16 (1.6)

.078 [5/64 (2.0 mm) Drill]

 

 

.045 & .052 (1.1 & 1.3)

.062 [1/16 (1.6 mm) Drill]

 

 

.023-.035 (0.6-0.9)

.055 [(1.4 mm) #54 Drill]

 

 

All dimensions in inches and (millimeters)

Switch Requirements

1/2 Amp AC 24 Volts - Inductive

1/2 Amp DC 24 Volts - Inductive

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Contents Synergic 7F and Synergic 7FH ARC Welding can be hazardous Apr. ‘93Cylinder may explode if damaged Mar. ‘93Précautions DE Sûreté Sûreté Pour Soudage a L’ArcTable of Contents Please Examine Carton and Equipment For Damage Immediately Standard Features Wire Feed FeaturesGeneral Description Recommended Processes and EquipmentControl Features Causes mode lights to sequence Y P a D a N D D I S P L a Y DescriptionKeypad Seven key, membrane type with snap tactile feel Top to bottom starting fromOptional Features Drive Roll and Guide Tube KitsMiscellaneous Options Specifications for Synergic 7F Synergic 7FH Type K678-1 K679-1 K679-2 Wire Speed RangeModel Installation Safety PrecautionsProcedure to Install Drive Roll and Guide Tubes Wire Feed Drive Roll and Guide Tube KitsSteel Wire Sizes Roll Aluminum Wire SizesGun and Cable Assemblies with Standard L. E. Connections Gun Cable ConnectionGmaw Guns Innershield GunsGun Cable Connections Wire Feeder to Gun Synergic 7F Water Connections for Water-Cooled GunsGmaw Shielding Gas Electrical Installation Work CableCurrent 60% Duty Cycle Up to 100 ft Length 30mOptional Features Installation K648 or K649 Input Cable Assembly See ElectricalInstallation section for instructions Power-Down Save Operation Keys Mode SelectionOperating Instructions Current indicated positionDisplay Control Keys Acceleration Selection Selection of English or Metric Speed Display UnitsRun-In Selection Step Trigger Mode Selection Feeding Electrode and Brake AdjustmentTo Mount 10 to 44 lb 4.5-20kg Spool 12/300mm Diameter To Mount a 50-60lb 22.7-27.2kg Coil Feeding ElectrodeWire Loading of 13-14lb 6kg Innershield Coils Idle Roll Pressure SettingGas Guard Regulator Setting Optional K659-1 Wire Reel Changing Wire Feed Overload ProtectionMaking a Weld Explanation of Prompting Error Messages Maintenance Routine MaintenanceWire Reel Mounting 50 22.7kg and 60lb 27.2kg Coils Avoiding Wire Feeding ProblemsTroubleshooting Guide Problems Communications in control cableProblems For continuity Refer to Wiring Wiring & connectionsWhen trigger is closed and no Gun connector Trigger sockets on gun connectorProblems Cold Feed key does not turn Defective keypad or Display PC Dual Procedure is not Gun has not been selected at With the remote switch open. If aFor replacing PC boards Problems with serial Troubleshooting information. SeeHXX Procedure for Replacing PC Boards Electric Shock can kill Switch RequirementsInside Input I NControl BOX Dimension Print Wire Feed Unit Dimension Print How To Read Shop Drawings New Lessons in Arc WeldingNeed Welding Training? $700.00Precaucion Warnung
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