Troubleshooting Power Source - Miller Electric Spectrum 1251 Owner's Manual

7-6. Troubleshooting Power Source

Trouble
No pilot arc; difficulty in establishing an
arc. arc.
No cutting output; Power light off;
Trouble lights off; Ready light off; fan
motor FM does not run.
Pilot arc working; no cutting output;
Power light on; Trouble lights off; fan
motor running.
No gas/air flow; Power light on; Trouble
lights off; fan motor running.
Pressure Trouble light On.
Cup Trouble light On.
Temperature Trouble light On.
Trouble lights not working.
Power light flashing, Trouble lights off.
Pressure trouble light flashes.
Short tip life.
OM-201 872 Page 42
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A complete Parts List is available at www.MillerWelds.com
Clean or replace worn consumables as necessary (see torch Owner's Manual).
Check for damaged torch or torch cable (see torch Owner's Manual).
Check position of cut/gouge switch. If using cutting consumables, be sure that switch is in the CUT
position. If using gouging consumables, be sure that switch is in the GOUGE position.
Place Power switch in On position.
Place line disconnect device in On position (see Section 4-7).
Check line fuse(s) and replace if needed or reset circuit breakers (see Section 4-9).
Be sure work clamp is connected.
Clean or replace worn consumables as necessary (see torch Owner's Manual).
Have Factory Authorized Service Agent check for proper torch connections. Check operation of gas
valve AS1, and check gas/air system for leaks. Check filter element (see Section 7-5).
Check for correct gas/air pressure adjustment (see Section 5-2).
Check for sufficient gas/air supply pressure (see Section 4-5).
Check for dirty air filter/regulator and replace, if necessary (see manufacturer's instructions).
Check air lines for leaks.
Have Factory Authorized Service Agent check pressure switch and control board.
Check torch shield cup (see Section 7-3). Reset power switch.
Have Factory Authorized Service Agent check for proper torch connections.
Unit overheating. Allow fan to run; the Trouble light goes out when the unit has cooled.
Have Factory Authorized Service Agent check control board.
Have Factory Authorized Service Agent check unit.
Reset power switch. Have qualified technician check input line power. Make sure line power is three
phase. Single phase power will cause an incorrect power condition.
Unit lost pressure (momentarily) while cutting. Check air line for leaks.
Check and clean drag shield of any slag, particles, and debris.
Check position of cut/gouge switch. Place switch in correct position to match the process.
Check for correct gas/air pressure adjustment (see Section 5-2).
Remedy