Connection To Ground Cable; Torch Connection; Torch Consumable Parts Mounting; Compressed Air - Helvi PC75 Manual De Uso

• When working in a confined space, the power
source must be kept outside the welding area
and the ground cable should be fixed to the
workpiece. Never work in a damp or wet area,
in these conditions.
• Do not use damaged input or welding cables
• The welding torch should never be pointed at
the operator's or at other persons' body;
• The power source must never be operated
without its panels; this could cause serious
injury to the operator and could damage the
equipment.

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 possi-
ble to the cutting area. The use of the metallic
structures which are not part of the workpie-
ce, 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 pie-
ce which has to be removed.

TORCH CONNECTION

Ensure unit is off and unpluged from the power
receptacle.
Supplied torch, manual or automatic, 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.
Figure 11
WARNING!: Before starting the cutting
operations verify that the parts are pro-
perly assembled by inspecting the head of
the torch as shown on paragraph "Torch
Maintenance".

TORCH CONSUMABLE PARTS MOUNTING

Position the torch with the outside protection nozzle
facing upward to prevent these parts from falling out
when the nozzle is removed.
WARNING: Wait the torch has completely
cooled before replacing torch parts to avoid
any damage to the torch head.
To change the torch consumable parts use the
following procedure:
1. Unscrew and remove the shield cup from the
Torch Head Assembly.
2. Remove the tip, gas distributor, and electrode.
3. Install the electrode, gas distributor, and tip.
Choose the correct consumable parts, refer
to the paragraph "Torch consumable parts
selection".
4. Hand tighten the shield cup until it is seated
on the torch head. If resistance is felt when
installing the cup, check the threads before
proceeding.
5. if necessary, install also the spacer.

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 au-
tomatically 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 war-
ning to the operator to adjust air pressure
and avoid that unit stops working.
EN-7