Miller Electric Trailblazer 251 NT Owner's Manual page 32

Trouble
Low weld output.
High weld output.
Weld output cannot be adjusted.
Erratic weld output.
Remote contactor control does not
activate contactor.
No power output at Remote 14
receptacle RC1.
Lack of high frequency; difficulty in
establishing Gas Tungsten Arc Weld-
ing arc.
Wandering arc – poor control of arc
direction.
Tungsten electrode oxidizing and not
remaining bright after conclusion of
weld.
OM-486 Page 28
Check control settings.
Place Remote Amperage/Voltage switch in Panel position, or move switch to Remote 14 position and
connect remote amperage/voltage control to Remote 14 receptacle RC1.
Check and clean air cleaner as necessary (see Section 7-3).
Check and adjust engine speed (see Section 7-6).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
See engine manual.
Check control settings.
Check and adjust engine speed (see Section 7-6).
Check for obstructed movement of solenoid linkage (see Section 7-6).
Have Factory Authorized Service Agent check field current control board PC2.
Check position of Remote Amperage/Voltage switch (see Section 5-1).
Have Factory Authorized Service Agent check field current control board PC2.
Check control settings.
Clean and tighten connections both inside and outside unit.
Check and secure lead connections to A/V control.
Be sure connection to work piece is clean and tight.
Remove excessive coils from weld cables.
Use dry, properly stored electrodes.
Check and adjust engine speed (see Section 7-6).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
Place Output (Contactor) switch in Remote 14 position (see Section 5-1).
Check and tighten connections to Remote 14 receptacle RC1 (see Section 4-8).
Reset circuit breaker CB1 and/or CB2 (see Section 7-7).
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.
Reduce gas flow rate.
Select proper size tungsten. Properly prepare tungsten.
Shield weld zone from drafts.
Increase postflow time.
Check and tighten all gas fittings.
Properly prepare tungsten.
Remedy