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a)A metal underground water pipe in direct contact with the earth for ten feet or more.
b)A 3/4” (19mm) galvanized pipe or a 5/8” (16mm) solid galvanized iron, steel or copper rod driven at least eight feet into the ground.
The ground should be securely made and the ground- ing cable should be as short as possible using cable of the same size as the work cable, or larger. Grounding to the building frame electrical conduit or a long pipe system can result in
6.Keep cover and all screws securely in place.
7.Electrical conductors within 50 ft (15.2m) of the welder should be enclosed in grounded rigid metal- lic conduit or equivalent shielding, wherever possi- ble. Flexible metallic conduit is generally not suit- able.
8.When the welder is enclosed in a metal building, the metal building should be connected to several good earth driven electrical grounds (as in 5 (b) above) around the periphery of the building.
Failure to observe these recommended installation procedures can cause radio or TV and electronic equipment interference problems and result in unsatis- factory welding performance resulting from lost high frequency power.
INPUT CONNECTIONS
Be sure the voltage, phase, and frequency of the input power is as specified on the rating plate, located on the rear of the machine.
208/230 volt models have a NEMA
Have a qualified electrician provide input power supply to the receptacle or cord in accordance with all local and national electrical codes. Use a single phase line or one phase of a two or three phase line. Choose an input and grounding wire size according to local or national codes. Refer to the Technical Specifications page at the beginning of this section. Fuse the input circuit with the recommended super lag fuses or delay type1 circuit breakers. Using fuses or circuit breakers smaller than recommended may result in “nuisance”
1Also called “inverse time” or “thermal/magnetic” circuit breakers; circuit breakers which have a delay in tripping action that decreases as the magni- tude of the current increases.
INPUT RECONNECT PROCEDURE
On multiple input voltage welders, be sure the machine is connected per the following instructions for the volt- age being supplied to the welder.
CAUTION
Failure to follow these instructions can cause immedi- ate failure of components within the welder.
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Multiple voltage models are shipped connected for the highest voltage. To change this connection refer to the following instructions.
WARNING
ELECTRIC SHOCK can kill.
•Turn the input power OFF at the disconnect switch or fuse box before working on this equipment.
For the lowest rated voltage connection (Refer to figure A.1):
1.Remove the sheet metal cover.
2.Disconnect lead H3 from the power switch and insu- late with the insulation from the H2 lead.
3.Connect lead H2 to the power switch where H3 was connected.
4.Tighten connections.
5.Replace sheet metal cover and all screws
For the highest rated voltage connection (Refer to figure A.1): The machine is normally shipped connected for the highest rated voltage, however verify the following:
1.Remove the sheet metal cover.
2.Disconnect lead H2 from the power switch and insu- late with the insulation from the H3 lead.
3.Connect lead H3 to the line switch where H2 was connected.
4.Tighten connections.
5.Replace sheet metal cover and all screws.
