MAINTENANCE
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SAFETY PRECAUTIONS
WARNING
ELECTRIC SHOCK can kill.
•Only qualified personnel should per- form this maintenance.
•Turn the input power OFF at the dis- connect switch or fuse box before working on this equipment.
•Do not touch electrically hot parts.
OVERLOAD PROTECTION
This welder has thermostatic protection from excessive duty cycles, overloads, loss of cooling, and high ambi- ent temperatures. When the welder is subjected to an overload or loss of cooling, a thermostat will open. This condition will be indicated by the illumination of the yellow Thermostatic Protection Light on the case front . The fan will continue to run to cool the power source. No welding is possible until the machine is allowed to cool and the Thermostatic Protection Light goes out.
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WARNING
To avoid receiving a high frequency shock, keep the TIG torch and cables in good condition.
FAN AS NEEDED (F.A.N.)
The Square Wave TIG 275 has the F.A.N. circuit fea- ture, which means the cooling fan will operate only while welding, then for about 6 minutes after welding has stopped. The cooling fan will operate conintuous- ly if the yellow Thermstatic Protection Light in “ON.”
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ROUTINE AND PERIODIC
MAINTENANCE
Very little routine maintenance is necessary to keep your Square Wave TIG 275 running in top condition. No specific schedule can be set for performing the fol- lowing items; factors such as hours of usage and machine environment should be considered when establishing a maintenance schedule.
1.Periodically blow out dust and dirt which may accu- mulate within the welder using an air stream.
2.Inspect welder output and control cables for fray- ing, cuts, and bare spots.
3.Inspect the spark gap at regular intervals to main- tain the recommended spacing. See the Service Procedures Section for complete information on spark gap settings.
4.The fan motor has sealed ball bearings which require no maintenance.
SERVICE PROCEDURES
WARNING
Use extreme caution when working with the secondary circuit of the high frequency transformer. Turn the input power off using the disconnect switch or fuse box before working inside the machine. This is particularly important when working on the secondary circuit of the high voltage transformer (T3) because the output volt- age is dangerously high.
DO NOT APPLY POWER TO THE SQUARE WAVE TIG 275 WITH THE SIDES AND ROOF REMOVED. The case front and case back assemblies tend to lean in towards the center assembly; there is a danger of a short circuit when this occurs. If you must troubleshoot the machine with power applied, do so with the roof in place, and check for shorts before applying power.
Operation of the Square Wave TIG 275 should be trou-
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