Lincoln Electric V205-T service manual Step Diagram, Local/Remote push button Selects the welding

Page 19

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B-5

OPERATION

B-5

5. Output / Parameter Adjust Knob- Allows you to

 

2 STEP DIAGRAM 1

 

 

continuously adjust the current both in TIG and in Stick

 

(1)

welding. Allows you to change the value, shown on

 

 

"Digital Display Item 6", of the parameter selected with

 

 

"Setup/Parameter select button Item 4".

 

 

 

6. Digital Display - displays currently set values for

 

 

each mode or welding parameter.

 

 

 

7. Local/Remote push button - Selects the welding

 

 

current adjusting system:

 

Possible variations of this standard sequence is shown

• from front panel

 

in (2 step diagram 2). It is possible to press and hold

• from remote control

 

the TIG torch trigger a second time during downslope

The LED beside the symbol confirms the selection.

to restart. After the trigger is pressed the output current

 

 

will increase to the welding current. This operation is

8. Tig Trigger Sequences -

 

shown in (2 step diagram 2).

For the V205-T AC/DC, TIG welding can be done in

 

2 STEP DIAGRAM 2

either the 2-step or 4-step mode which is selected with

 

(1)

(2)

the Trigger Mode Push Button.

 

 

 

 

2-Step Sequence

 

 

 

With the Trigger Mode switch in the 2-step position,

 

 

the following welding sequence will occur. This

 

 

sequence is shown in (2-step diagram 1)

 

 

 

1. Press and hold the Arc Start Switch to start the

4-Step Sequence

sequence.

With the 4-step Selected, the following welding

 

sequence will occur.

The machine will open the gas valve to start the flow

 

of the shielding gas. After a 0.5 second preflow time,

1. Press and hold the Arc Start Switch to start the

to purge air from the torch hose, the output of the

sequence.

machine is turned ON. At this time the arc is started.

 

 

The machine will open the gas valve to start the flow

After the arc is started the output current will be

of the shielding gas. After a 0.5 second preflow time,

increased from the start current to the welding cur-

to purge air from the torch hose, the output of the

rent. Both the start current and increase, or upslope

machine is turned ON. At this time the arc is started.

time are presettable. The default start current is 15

 

amps and the default upslope time is 0.2 seconds.

After the arc is started the output current will be at

 

the Start current. This condition can be maintained

2. Release the Arc Start Switch to stop welding.

as long or as short as necessary.

The machine will now decrease the output current at

 

a controlled rate, or downslope time, until the Finish

If the Start current is not necessary, do not hold the

current, (also commonly referred to as Crater

TIG torch trigger as described at the beginning of this

Current) is reached and the output of the machine is

step. Instead, quickly press and release the trigger.

turned OFF. Both the Downslope Time and the Finish

In this condition, the machine will automatically pass

Current are can be preset.

from Step 1 to Step 2 when the arc is started.

After the arc is turned OFF, the gas valve will remain

2. Release the TIG torch trigger to start the main part

open to continue the flow of the shielding gas to the

of the weld.

hot electrode and work piece. The duration of this

 

postflow shielding gas is adjusted by the Postflow

The output current will be increased from the start

Parameter.

current to the welding current. Both the start current

 

and increase, or upslope time are presettable. The

 

default start current is 15 amps and the default ups-

 

lope time is 0.2 seconds.

V205-T AC/DC

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Contents Invertec V205-T AC/DC Safety Electric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Table of Contents Installation Section Operating Temperature Range Storage Temperature Range InstallationEnvironmental Area Select Suitable LocationStacking TiltingInput Connections Reconnect ProcedureEngine Driven Generator Attachment Plug Installation230V Input 115V InputOutput and GAS Connection for TIG Welding Figure A.1 Output Connection for StickWork Cable Connection Shielding GAS Connection Remote Control ConnectionV205-T AC/DC Table of Contents Operation Section Limitations Safety InstructionsGeneral Description Welding CapabilityFigure B.1 Rear Control Panel Figure B.1Figure B.2 Controls and SettingsLocal/Remote push button Selects the welding Step DiagramTIG DC TIG AC Indicator Parameter Default SET UP MenuWelding Polarity Output LimitationsFigure B.5 Filler Material Steel TIG WeldingCopper TIG Welding Tips for AC TIG WeldingProtective GAS AC TIG Welding Quick Start UPDC TIG Welding Quick Start UP Accessories Table of ContentsTIG Torch Kits Optional AccessoriesCompatible Equipment Cable PlugsTable of Contents Maintenance Input Filter Capacitor Discharge Procedure Safety PrecautionsRoutine Maintenance Table of Contents Theory of Operation Section General Description Theory of OperationInput Board and BUS Board Figure E.3 Main Igbt Inverter Board Main Igbt Inverter BoardSuperimposition Board Main TransformerOutput Module Transistor Board Output Module and Clamping BoardOutput Filter Board CONTROL/DISPLAY Board High Frequency HF BoardFigure E.6 Igbt Insulated Gate Bipolar Transistor Igbt OperationTable of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairElectric Shock can kill PC Board Troubleshooting ProceduresOutput Problems Function Problems Function Problems Secondary Power Board Test Welding Problems Figure F.1 External Diagnostics Troubleshooting & Repair External DiagnosticsFigure F.2 Troubleshooting & Repair Internal DiagnosticsLED Internal DiagnosticsV205-T AC/DC Description Input Filter Capacitor Discharge ProcedureDischarge Procedure Input Filter Capacitor Discharge ProcedureInput Filter Board Test Input Filter Board Figure F.5 Input Filter Board V205-T AC/DC Main Igbt Inverter Board LOW Voltage Test Main Board Table F.1 Test Points LEDFigure F.7 Main Igbt Inverter Board Location TP2 MF2CONTROL/DISPLAY Board Test Control/Display Board Figure F.9 CONTROL/DISPLAY Board Location CN2 CN7 CN1Table F.4 Plug CN7 Test Points CN1Table F.2 Plug CN1 Test Points Table F.3 Plug CN2 Test PointsBUS Board Test BUS Board Table F.8 Plug CN7 Test Points Table F.5 Plug CN2 Test PointsTable F.6 Plug CN3 Test Points Table F.7 Plug CN4 Test PointsCN4 CN2Main Inverter Board Upfr Section Test Table F.10 Voltage Checks with 115 VAC Applied to Machine Figure F.14 Upfr Location on Main BoardDD1 MF9 TP9 Gndpwr RL1V205-T AC/DC Output Filter Board Test Troubleshooting and RepairOutput Filter Board Figure F.18 Output Filter Board Plug CN1 Figure F.17 Output Filter Board Plug LocationV205-T AC/DC Secondary Power Board Test Secondary Power Board Table F.13 Voltage Checks with 115 VAC Applied to Machine Figure F.20 Secondary Power Board Test Point LocationsV205-T AC/DC Main Inverter Board Welding Logic and Inverter Section Test Figure F.21 Main Board Location Main Inverter BoardTable F.16 Voltage Checks with 115 VAC Applied to Machine Table F.15 Feedback Voltage SignalsTable F.17 LED Check in Stick Mode Table F.14 LED FunctionsTP14 TP15 TP16 TP19 TP31 CN4/1-2 Short Circuit Ohms CN5/1-2 MF15 VDS MF12 MF16 VDS Figure F.23 Main Board Lower Left TP9 Ground PowerV205-T AC/DC Input Filter Board Removal and Replacement Input Filter Board Removal and Replacement RV1 V205-T AC/DC Main Igbt Board Removal and Replacement Main Igbt Board Removal & Replacement CN2 CN1 V205-T AC/DC CONTROL/DISPLAY Board Removal and Replacement CONTROL/DISPLAY Board Removal & Replacement CN3 CN7V205-T AC/DC Output Filter Board Removal and Replacement Removal and Replacement Casefront Mounting Screws Phillips Head Screws CN1 CN2 Output Diodes Removal and Replacement Figure F.35 Output Diode Location Output DiodesOutput Transistor Removal and Replacement Output Transistor Removal and Replacement Plug CN1 5mm V205-T AC/DC Table of Contents Electrical Diagrams Section Electrical DiagramsWiring Diagram V205-T AC/DC Standard Diagram SVM Error Reporting Form
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