Helvi PC 73 Manual De Uso Y Manutención página 17

POWER SUPPLY CONNECTION
The machine must be connected to a Line-Neutral system with a "PE" protected grounding wire. Check
that the relevant socket terminal is actually connected to the distribution system grounding.
The plug must be connected to the power cord by a licensed electrician.
CONNECTION TO GROUND CABLE
Connect the dinse plug to the socket and the work cable clamp to the piece to be cut or to the metallic
workbench. Take following precautions:
√ Verify that there is a good electrical contact particularly if insulated or oxidated coated sheets
are cut.
√ Make ground connections as close as possible to the cutting area. The use of the metallic struc-
tures which are not part of the workpiece, such as the 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 has to be removed.
TORCH CONNECTION
Ensure unit is off and unpluged from the power receptacle.
Supplied torch has a quick connection system called "Easy Fit" . Correctly align the "Easy Fit" pins
and connect it to the connector on the front panel of the unit by handscrewing the plastic ring.
WARNING!: Before starting the cutting operations verify that the parts are properly assembled
by inspecting the head of the torch as shown on paragraph "Torch Maintenance"
LOCATION AND HANDLING OF THE POWER SOURCE
√ Choose location verifying that there is a good air flow and no dust, smoke or gas is present.
√ Make sure that obstacles do not prevent the cooling air flow out of front and rear openings of
the machine.
√ Arrange an open space of at least 5m around the machine.
√ In the case the machine has to be moved, always disconnect the plug from the outlet and gather
the cables and pipes so as not to damage them.
COMPRESSED AIR
A source of clean, dry air or nitrogen must be supplied to your plasma cutting unit. The supply
pressure must be between 5 and 6 bar. The flow rate is approximately 250L/min. Failure to observe
these precautions could result in excessive operating temperatures or damage to the torch.
An air regulator is included with the unit with optimum pressure setting set to 5.2 Bar.
Note: the regulator should never be set above 6 bar.
AUTOMATIC PURGE
Oil in the air is a severe problem and must be avoided.
The unit is also equipped with an air filter which captures water and oil vapor.
Water contained in the filter glass gets drained automatically by disconnecting compressed air by the
unit.
Note: The unit will not operate if the input air pressure is below 3.5 Bar. When pressure
drops to 4 bar the digital display views the pressure value as warning to the operator to
adjust air pressure and avoid that unit stops working.
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