11 | MAINTENANCE | 11 |
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SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
•Only qualified personnel should perform this maintenance.
•Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.
•Do not touch electrically hot parts.
ommended. If the contacts are replaced reset the gap spacing to 0.015. Refer to figure C.1. Note in highly dirty environments where there is an abun- dance of conductive contaminants, use a low pres- sure air stream to clean the spark gap. Do not dis- turb the factory setting.
8.Inspect gas hose and inlet fitting for cracks or leaks.
9.Replace any unreadable labels or decals.
10.Verify that the machine and welding circuit is prop- erly grounded.
FIGURE C.1 SPARK GAP
WARNING
To avoid receiving a high frequency shock, keep the TIG torch and cables in good condition.
ROUTINE AND PERIODIC MAINTENANCE
1.Disconnect power supply lines to machine before performing periodic maintenance.
2.Periodically clean the inside of the machine with a low pressure air system. Be sure to clean the following components thoroughly.
•Main Transformer
•Electrode/Gas Output Receptacle
•Polarity Switch
•Rectifier Assembly
•Arc Starter/Spark Gap Assembly
•PC Boards
•Fan Blades
3.Inspect welder output and control cables for fraying, cuts, and bare spots.
4.Keep TIG torch and cables in good condition.
5.Clean air louvers to ensure proper air flow and cooling.
6.The fan motor has sealed ball bearings which require no maintenance.
7.The arc starter spark gap spacing is factory set at 0.015 inch. It typically will not require periodic maintenance. Refinishing the contacts is not rec-
.015 Spark Gap
LEFT SIDE OF MACHINE
FAN MOTOR OR FAN BLADE REPLACEMENT
When installing a new fan blade or fan motor be sure to maintain proper shaft spacing per Figure C.2 below.
.30
Figure C.2
SQUARE WAVE TIG 175
