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DIP Switch 7 & 8: Upslope Timer
These control the upslope timer for TIG welding (used only on "T" type machines). The following table shows the DIP Switch settings and selected upslope time.
DIP Switch 7 | DIP Switch 8 | Upslope Time |
ON | ON | 0.1 seconds |
OFF | OFF | 0.5 seconds |
ON | OFF | 1 second |
OFF | ON | 4 seconds |
Start/Crater Current Adjustment
The start/crater current of a "T" type machine can be changed if necessary. The values are set from the fac- tory.
European Machines:
20% (160A welding current = 32A start/crater current)
USA Machines:
10% (160A welding current = 16A start/crater current)
WARNING
be sure that all installation, operation, mainte- nance and repair procedures are performed only by qualified individuals. Lincoln Electric is not responsible for damages caused by improper installation, improper care or abnormal operation.
This adjustment procedure must be performed only by Lincoln trained service technicians. The machine will be operating with the cover removed where it is possible to come in contact with high voltages. Read all the following instructions before starting the procedure.
ELECTRIC SHOCK CAN KILL:
•Welding equipment generates high voltages.
•Do not touch the live parts of the machine, the electrode, the work clamp, or connected work pieces when this equipment is on.
•Insulate yourself from live electrical connec- tions, the electrode, the work clamp, and the connected work pieces.
1.Remove the cover of the machine to access the control Printed Circuit Boards on the case front.
2.To adjust the start/crater current, output current from the machine must flow through a load bank or a TIG arc. Connect the necessary equipment. In both cases, load bank or TIG arc, a trigger must be connected to the machine. If a load bank is used, it must be setup for 160A and approximately 25V.
3.Make sure all electrical connections are free from contact with other parts of the machine. Reconnect the case back if necessary. Turn ON the machine.
4.On the control panel of the machine, select the fol- lowing:
•Mode Switch: LIFT TIG (Do not use HF TIG or damage to measuring equipment will occur.)
•Trigger Mode: 4 Step
•Pulsing: OFF
•Output Current: Maximum (160A)
5.Activate the trigger of the machine to achieve the start or crater current portion of the welding sequence. Refer to the trigger sequences explained above if more information is needed.
6.In this condition, measure the output current of the machine and adjust the start/crater current as nec- essary. The calibration trimmer for the start/crater current is located on the left side of the machine (as viewed from the front) on the display board. The access hole for this trimmer is the higher one on the display board. (Do not adjust the lower trimmer on the display board; this is the output current calibra- tion.)
The output current is set to 160A, therefore the start/crater current calibration will be a percentage of this 160A setting. Use the following equation for determining the desired start/crater current calibra- tion:
Desired start/crater current percentage multiplied by 160 = calibration current.
For example, to calibrate the machine for 15% start/crater current, multiply this by 160 to get the calibration current ( 0.15 x 160 = 24).
7.Release the trigger to turn off the output of the machine. Turn OFF the machine and disconnect it from the input source. Reassemble the machine making sure the ground wire to the cover is con- nected.
