INSTALLATION |
Use of normal 20 amp household breakers may result in over current trips. If breaker trips occur, reduce the cutting current output until nuisance trips stop.
COMPRESSED AIR OR GAS INPUT CONNECTION
A source of clean, dry air or nitrogen must be supplied to the PLASMA 20. Oil in the air is a severe problem and must be avoided. The supply pressure must be between 72.5 and 150 psi (5 and 10.3 bar). The flow rate is approximately 3.5 cu. ft./min. (100L/min.). Failure to observe these precautions could result in excessive operating temperatures or damage to the torch.
WARNING
Air with considerable quantity of humidity or oil may cause an excessive wear of the parts or even damage the torch.
If there are any doubts about the quality of the compressed air available, it is suggested that an air dryer be installed before the input filter. Using flexible airline, connect the compressed air to the rear of the machine. Do not exceed maximum entry pressure of 150 PSI (10.3 Bar). The pressure must be adjusted to 72.5 PSI (5 Bar), minimum.
•To use the air fitting supplied with the machine apply teflon tape to the fitting threads and install the fitting in the port at the rear of the machine.
NOTE: When using nitrogen gas from a cylinder, the cylinder must have a pressure regulator.
•Maximum psi from a nitrogen gas cylinder to the PLASMA 20 regulator should never exceed 150 psi (10.3 Bar).
•Install a hose between the nitrogen gas cylin- der regulator and the PLASMA 20 gas inlet.
WARNING
CYLINDER could explode if damaged.
• Keep cylinder upright and
chained to a fixed support.
• Keep cylinder away from areas 
where it could be damaged.
•Never lift machine with cylinder attached.
•Never allow the cutting torch to touch the cylin- der.
•Keep cylinder away from live electrical parts.
•Maximum inlet pressure 150 PSI (10.3 Bar).
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CONNECTION TO GROUND CABLE
Connect the work cable clamp to the piece to be cut or to the metallic workbench. Take the following pre- cautions:
Verify that there is a good electrical contact particular- ly if insulated or oxidated coated sheets are cut.
Make ground connections as close as possible to the cutting area. The use of the metallic structures which are not part of the workpiece, such as return cable of the cutting current, may endanger the safety system and give poor cutting results.
Do not make a ground connection on the piece which is to be cut off.
TORCH CONNECTION
Before starting the cutting operations verify that the parts are properly assembled by inspecting the head of the torch as shown in the “Operations Section”(Torch Consumable Parts).
Read and understand this entire section before oper- ating the machine.
PLASMA 20