TROUBLESHOOTING | |||
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TROUBLESHOOTING GUIDE
WARNING
ELECTRIC SHOCK can kill.
•Do not touch electrically live parts such as output terminals or internal wiring.
•Turn the input power off at the fuse box before working on equiptment.
•Only qualified personnel should perform this installation.
HOW TO USE THIS GUIDE: Carefully read through each applicable section listed below. Remember that most prob- lems are caused by improper setup, such as switch settings, control settings, electrode sizes, improper shielding gases, etc.
Observe Safety Guidelines detailed throughout this manual.
If you believe the setup is correct and the trouble still exists, first check for the obvious: input power, blown fuses, loose PC board connectors, broken wires and the like. The sections listed below are intended to help you find the less obvious sources of trouble.
General Troubleshooting
Stick Welding Trouble
TIG Welding Trouble
Lower Panel Controls Trouble
Accessory Troubles
GENERAL MACHINE TROUBLE
SYMPTOM |
| CAUSE AND REMEDY | |||
Machine will not turn on. | 1. | Input supply lines not “hot”. Check input supply line fuses. | |||
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| 2. | Blown control circuit fuse (F1). Replace. | ||
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| 3. | Thermostat (secondary) has opened. Allow machine to cool | ||
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| before restarting. | ||
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Control circuit fuse (F1) keeps blowing. | 1. | Machine reconnect panel hooked up for wrong voltage. | |||
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| Connect per connection diagram in this manual. | ||
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| 2. | Fuse is too small. Use 1/2 amp fuse. | ||
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| 3. | Shorted control transformer T5. Replace. | ||
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| 4. | Defective Power, Meter, Control, or Protection PC board. | ||
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| Replace PC boards one by one in this order until fuse no | ||
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| longer blows. | ||
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Digital meter does not light, but welder | 1. | Defective Meter PC board. Replace. | |||
turns on as indicated by the Pilot Light | 2. | Defective Control PC board. Replace. | |||
and fan operation. | |||||
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Accessories plugged into 115 volt recep- | 1. | Is accessory defective? Plug it into a known “hot” receptacle | |||
tacle do not work. |
| to check if it works. | |||
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| 2. | Circuit Breaker CB1 is open. Before resetting the Circuit | ||
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| Breaker, find out why it opened. Is the accessory exceeding | ||
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| the 15 amp maximum load? Is the accessory defective? | ||
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Cannot preset a current, but meter lights up. | 1. | Set control knob to 12 o’clock position. Switch Start function | |||
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| OFF. Machine should weld at approximately 80 amps. If | ||
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| machine welds okay but ammeter does not display the weld- | ||
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| ing current while welding: | ||
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| a) The Meter PC board may be defective. Replace. | ||
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| b) The Control PC Board may be defective. Replace. | ||
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| 2. | If machine does not weld: | ||
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| a) Current control pot may be defective. Replace. | ||
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| b) The Control PC board may be defective. Replace. | ||
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| WARNING |
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This Troubleshooting Guide is designed to be used by the machine Owner/Operator. Unauthorized repairs performed on this equipment may result in danger to the technician and machine operator and will invalidate your factory warranty. For your safety, please observe all safety notes and precautions detailed in the Safety Section of this manual to avoid electrical shock or danger while troubleshooting this equipment.
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SQUARE WAVE TIG 355
