Miller Electric 280 NT - Manual (Page 41)

OM-4402 Page 37
Trouble Remedy
Lack of high frequency; difficulty in
establishing Gas Tungsten Arc Weld-
ing arc.
Use proper size tungsten for welding amperage.
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
direction.
Reduce gas flow rate.
Select proper size tungsten. Properly prepare tungsten.
Tungsten electrode oxidizing and not
remaining bright after conclusion of
weld.
Shield weld zone from drafts.
Increase postflow time.
Check and tighten all gas fittings.
Properly prepare tungsten.
9-2. Auxiliary Power Troubleshooting
Trouble Remedy
No power output. Reset circuit breakers (see Section 6-1).
Check fuse F1, and replace if necessary (see Section 7-7 or 8-7).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
Low power output. Check and clean air cleaner as necessary.
Check and adjust engine speed (see Section 7-6 or 8-6).
See engine manual.
High power output. Check and adjust engine speed (see Section 7-6 or 8-6).
Erratic power output. Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
Check receptacle wiring and connections.
Check governor according to engine manual.
9-3. Engine Troubleshooting
Trouble Remedy
Engine will not crank. Check fuse F6, and replace if open (see Section 7-7 or 8-7).
Check battery voltage.
Check battery connections and tighten if necessary.
Check plug PLG5 and plug PLG8 connections.
Have Factory Authorized Service Agent check Engine Control switch S5.