Miller Maxstar 140, Руководство пользователя

Страница: 24 / 44

OM-2224 Page 20
4-3. Troubleshooting
Trouble Remedy
No weld output; unit completely inop-
erative; Ready light Off. Place line disconnect switch for circuit powering welder in On position.
Check and replace line fuse(s), if necessary, or reset circuit breaker.
Be sure input power cord is plugged in and that receptacle is receiving input power.
No weld output; Ready light On; Over-
Temperature light Off. Check and secure loose weld cable(s) into receptacle(s) on welding power source.
Check and correct poor connection of work clamp to workpiece.
No weld output; Ready light On; Over-
Temperature light On. Unit overheated causing thermal shutdown. Allow unit to cool with fan On (see Section 2-5).
Reduce duty cycle or amperage to prevent further overload conditions.
Check and correct blocked/poor airflow to and around unit or move unit clear of blockages (see
Section 2-7).
Check and clean dirty power module (see Section 4-2).
No weld output; Ready light On; Over-
Temperature light Flashing. Turn Power Switch Off and back On again. If light continues to flash, call or take machine to Facto-
ry Authorized Service Agent (this condition may indicate a fault in the power section).
Erratic or improper welding arc or out-
put. Use proper size and type of weld cable (see your Distributer).
Clean and tighten all weld connections.
Check and reverse electrode polarity; check and correct poor connections to workpiece.
Fan not operating (unit is equipped
with Fan-On-Demand so fan runs only
when needed). Unit is cool and not warmed up enough to require fan cooling.
Check for and remove anything blocking fan movement.
Have Factory Authorized Service Agent check fan motor and control circuitry.
Stick welding problems: Hard starts;
poor welding characteristcs; unusual
Use proper type and size of electrode.
poor welding characteristcs; unusual
spattering problems.
Use method shown in Section 8 to get better starts.
Check and reverse electrode polarity; check and correct poor connections to workpiece.
TIG welding problems: Wandering arc;
hard starts; poor welding character-
Use proper type and size of tungsten.
hard starts; poor welding character-
istcs; spattering problems.
Use properly prepared tungsten.
Check and reverse electrode polarity; check and correct poor connections to workpiece.
TIG welding problems: Tungsten elec-
trode oxidizing and not remaining bright
Shield weld zone from drafts.
trode oxidizing and not remaining bright
after conclusion of weld.
Check shielding gas supply, and be sure it is the correct type (argon) and that the cylinder is not empty.
Check and tighten all gas fittings.
Check and change electrode polarity; move Changeover Switch to TIG position.