Miller Electric 280 NT manual Trouble, Remedy

	. A complete Parts List is available at www.MillerWelds.com
Trouble	Remedy
Lack of high frequency; difficulty in	Use proper size tungsten for welding amperage.
establishing Gas Tungsten Arc Weld-
ing arc.
	Reduce leakage of high frequency from torch or work cable (check grounding, remove excessive
	coils from weld cables, use shorter weld cables, etc.).
	Check cables and torch for cracked or deteriorated insulation or bad connections. Repair or replace
	necessary parts.
Wandering arc − poor control of arc	Reduce gas flow rate.
direction.
	Select proper size tungsten. Properly prepare tungsten.
Tungsten electrode oxidizing and not	Shield weld zone from drafts.
remaining bright after conclusion of
weld.
	Increase postflow time.
	Check and tighten all gas fittings.
	Properly prepare tungsten.
B. 60 Hz Generator Power Receptacles RC1 And RC2
Trouble	Remedy
No power output at 60 Hz ac recep-	Reset supplementary protectors CB1 and/or CB2 (see Section 7-1).
tacles RC1 or RC2.
	Stop welding, or place Speed Control switch in Generator Lock position to run engine at 1800 rpm. 60
	Hz receptacles RC1 and RC2 work only at 1800 rpm.
	Check receptacle wiring and connections.
	Have Factory Authorized Service Agent check brushes, slip rings, and circuit boards PC1 and PC2.
Low power output at 60 Hz ac recep-	Check and clean air cleaner as necessary.
tacles RC1 or RC2.
	Check engine electronic governor system. See engine manual.
High power output at 60 Hz ac recep-	Check engine electronic governor system. See engine manual.
tacles RC1 or RC2.
Erratic power output at 60 Hz ac	Have Factory Authorized Service Agent check brushes, slip rings, and circuit boards PC1, PC2, and
receptacles RC1 or RC2.	PC7.
	Check receptacle wiring and connections.
	Check governor according to engine manual.
C. Variable Frequency Generator Power Receptacle RC3
Trouble	Remedy
No generator power output at ac re-	Reset supplementary protector CB4 (see Section 7-2).
ceptacle RC3.
	Check receptacle RC3 for continuity and proper connections. Replace receptacle if necessary.
	Have Factory Authorized Service Agent check brushes and slip rings, and circuit boards PC1, PC2, and
	PC7.
Low generator power output at ac re-	Turn Engine Control switch to Run/Idle 3600/2400 RPM position.
ceptacle RC3.

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