Helvi COMBI PC 502 K Manual De Uso Y Manutención página 6

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.
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
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 low and no dust, smoke or gas is present.
√ Make sure that obstacles do not prevent the cooling air low 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 SUPPLY
A source of clean, dry air or nitrogen can be supplied to your plasma cutting unit. The supply pres-
sure must be between 72.5 and 150 psi (5 and 10.3 bar). The low rate is approximately 3.5 cu.ft./
min. (100 L/min.). Failure to observe these precautions could result in excessive operating tempera-
tures or damage to the torch.
An air regulator is included with the unit with the optimum pressure setting set to 65 PSI, 4,5 Bar.
NOTE: the regulator should never be set above 6 bar.
NOTE: The unit will not operate if the input air pressure is too low.
FUNCTIONS AND CONTROLS
1.ON/FF Switch – In the ON position the machine is ready for normal operation. All system
control circuits are activated. OFF position deactivates control circuits.
2.Output Current Knob - Adjusts the cutting current supplied by the machine according to the
thickness of material/speed.
3. Green LED– It blinks for a few seconds to show that capacitors are in charge and that the
unit is getting ready for operation. It turns ON when input voltage is applied within normal
range – blinks slowly when input voltage goes above 260Vac, or below 180Vac.
4. Yellow LED– Turns ON when the thermal protection is activated. Blinks slowly when the
under pressure protection is working (only while working with external air source).
5. Red LED–Turns ON when torch is triggered. Blinks quickly during 3 second safety pre-low
prior to pilot arc ignition. Blinks slowly if cutting arcs not initiated after 3 second pilot arc
ignition.
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