Hobart Welding Products ARCSTAR OM-487 - Manual (Page 37)

OM-487 Page 33
Trouble Remedy
Low weld output. 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 (see Section 4-8).
Check and clean air cleaner as necessary (see Section 7-3).
Check engine speed, and adjust if necessary (see Section 7-7).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
See engine manual.
High weld output. Check control settings.
Check engine speed, and adjust if necessary (see Section 7-7).
Check for obstructed movement of solenoid linkage (see Section 7-7).
Have Factory Authorized Service Agent check field current control board PC2.
Weld output cannot be adjusted. Check position of Remote Amperage/Voltage switch (see Section 5-1).
Have Factory Authorized Service Agent check field current control board PC2.
Erratic weld output. 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 engine speed, and adjust if necessary (see Section 7-7).
Have Factory Authorized Service Agent check brushes, slip rings, and field current control board PC2.
Remote contactor control does not
activate contactor. 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).
No power output at Remote 14
receptacle RC1. Reset circuit breaker CB1 and/or CB2 (see Section 7-8).
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.