Miller Electric NT 450, NT 500 manual Meter Functions For CC/CV Models

5-2. Meter Functions For CC/CV Models

.The meters display the actual weld output values for approximately three seconds after the arc is broken.

Mode			Meter Reading At Idle
			V		A
Scratch Start TIG		78.0		85
	Actual Volts (OCV)				Preset Amps
			V		A
Lift-Arc TIG		8.0		85
(GTAW)
			Actual Volts		Preset Amps
			V		A
Air Carbon Arc		78.0		85
	Actual Volts (OCV)				Preset Amps
			V		A
TIG (GTAW)				85
			Blank		Preset Amps
			V		A
MIG (GMAW)			24.5
			Preset Volts		Blank
			V		A
CC				85
			Blank		Preset Amps
			V		A
Stick (SMAW)			78.0		85
	Actual Volts (OCV)				Preset Amps
			V		A
Voltage-Sensing			78.0
Wirefeeder
	Flashes OCV And Preset Volts				Blank

5-3. Lift-Arc TIG Procedure For CC/CV Models

1 2

1 − 2

“Touch” Seconds

Do NOT Strike Like A Match!

With Mode switch in the Lift-Arc TIG position, start an arc as follows:

1TIG Electrode

2Workpiece

Touch tungsten electrode to work- piece at weld start point, hold electrode to workpiece for 1-2 seconds, and slowly lift electrode. An arc will form when electrode is lifted.

Normal open-circuit voltage is not present before tungsten electrode touches workpiece; only a low sensing voltage is present between electrode and workpiece. The solid-state output contactor does not energize until after electrode is touching workpiece. This allows electrode to touch workpiece with- out overheating, sticking, or getting contaminated.

Ref. S-156 279

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