DANGER!
Ensure that the machine is disconnected from the power supply before performing service or maintenance on any part of
the unit, cables or torch.
7.1.
The inverter
DO NOT open the unit. Service and maintenance of the machine may only be undertaken by an authorised service agent.
7.1.1.
Keep the machine clean by wiping with a soft cloth. Do not use abrasives.
7.1.2.
Periodically check to ensure that the carrying handle is in good order and condition. If not replace it immediately.
7.1.3.
Ensure that the front and rear air vents are not blocked.
7.2.
Cables and leads
7.2.1.
Check to ensure cables and leads are in good condition. If damaged, contact your authorised service agent.
7.2.2.
Keep cables and leads clean. Do not use solvents.
7.3.
Torch
Check torch regularly. Maintenance will depend on frequency and type of usage and is essential for correct
and safe use of the torch.
WARNING!
Ensure that the torch is cool before attempting any maintenance. Always re-assemble the torch
in the correct order as shown in fig. 7. Never use tools to tighten nozzle components, hand tighten only.
Manually dismantle the torch nozzle head (fig. 7). Items 2 and 4 show standard and optional (PP25 only)
electrodes and nozzles.
7.3.1.
Cap
(fig. 7.1).
Clean cap and check to ensure it is not damaged (including distortion, burns, cracks).
If in any doubt, replace.
7.3.2.
Electrode
(fig. 7.2).
Check the build-up on the emitting surface of the electrode. When the build-up is approximately 2mm
replace the electrode.
NOTE: We recommend that the electrode and nozzle are changed at the same time.
7.3.3.
Air distribution ring
(fig. 7.3).
Check that the ring is not burned or cracked and that the airflow holes are not obstructed. If damaged,
replace.
7.3.4.
Nozzle
(fig. 8.4).
If surface is oxidised, clean with extra fine abrasive paper. Check wear of the plasma arc hole and the
inner and outer surfaces. If hole has widened, or nozzle is damaged in any way, replace it. The nozzle “V”
crater should be 1.5mm in depth (fig. 8).
7.4.
Compressed air filter - PP25
The filter, beneath the regulator (fig. 2.3), removes condensation from the air system, and must be kept clean.
7.4.1.
Regularly inspect the filter. If the glass bowl contains water, drain by pushing the drain plug upwards.
7.4.2.
When the filter cartridge becomes dirty, replace it.
7.4.3.
Clean the filter bowl with soapy water only. Do not use abrasives or solvents.
7. MAINTENANCE
WARNING!
Before operating the machine ensure that you read, understand and apply Section 2 safety instructions and that you have
familiarised yourself with the controls. Ensure that the machine is disconnected from the power supply before moving or changing
accessories.
6.1.
Set-up
6.1.1.
PP25 - Ensure that the compressed air is connected correctly to the machine (see Section 4).
6.1.2.
Check that the earth cable is correctly clamped to the workpiece or work bench (see 5.2).
6.1.3.
Switch on the mains power supply. Switch on the machine by operating the switch on the rear panel (fig. 2.1 & 3.1).
6.1.4.
Set the current regulation control (figs. 2.2 & 3.2) to the required value.
6.1.5.
Press the torch button and release to commence the flow of cooling air (post-air).
6.1.6.
PP25 - Set the air pressure and check that the air gauge indicates the correct value.
6.1.7.
Allow the air flow to continue to remove any condensation from the torch. The air flow will automatically stop after approx. 30secs.
NOTE:
Longer than standard nozzles and electrodes are available (see Parts List) to improve accessibility in awkward cutting positions.
6.2.
Cutting from the edge
The torch provided with this unit should make contact with the material to be cut (touch-cut).
6.2.1.
Bring the torch nozzle toward the edge of workpiece and hold it at 3mm above the cutting line.
6.2.2.
Press and hold down the torch button. After about 0.5secs of pre-air the pilot arc will be generated.
If the distance between the torch nozzle and the workpiece is correct, the arc will immediately
jump to the workpiece and the cutting process will begin.
6.2.3.
Move the torch slowly and smoothly forward, on the surface of the workpiece, along the cutting line.
6.2.4.
Adjust the cutting speed according to the thickness of the material and the selected current.
6.2.5.
Check the underside of the cut. The arc should make a 5 - 10° angle with the vertical in the opposite
direction to the cutting direction (fig. 5).
6.3.
Cutting from the centre
6.3.1.
Place torch nozzle at an angle to the surface at the start-of-cut position (fig. 6).
6.3.2.
Initiate the pilot arc, then slowly and smoothly bring the torch head to the upright position.
The arc will pierce the workpiece and cutting can start.
6.4.
Arc off
6.4.1.
Release the torch button to switch off the arc. The post-air will continue to flow, cooling the nozzle.
6.4.2.
Other reasons for the arc ceasing are:
a) The distance between the torch nozzle and workpiece is too great.
b) You have completed a cut and have continued beyond the edge of a workpiece.
c) The waste falls away from the workpiece thus increasing the gap.
6. OPERATING INSTRUCTIONS
fig. 6
fig. 5
fig. 7
fig. 8
Original Language Version
PP25.V2, PP25PLUS.V2 Issue: 6 - 17/01/10
