5.7. Thermal security (Amber light)
5.7.1. As a safety feature, if the power transformer overheats, the torch will automatically de-activate and the amber light (fig. 3.8) will illuminate.
Restoration is automatic, the lamp will turn off once the temperature of the power transformer has returned to normal.
5.8. Torch
5.8.1. Although the machine and torch may be fully powered, to start the cutting process, the torch button must be fully depressed.
5.8.2. Release the button and the cutting will stop immediately. The cooling air (post-air) will continue to function.
5.8.3. As a safety feature, operation of the button is inhibited if the insulating nozzle holder is not fitted, or is incorrectly fitted, to the torch.
Note:
To minimise the possibility of accidental starting, the torch button must be pushed for at least 300 milliseconds before the cutting operation will start.
7. MAINTENANCE
DANGER!
Ensure that the cutter is disconnected from power supply before performing service or
maintenance
on any part of the unit, cables or torch.
7.1. The power unit
DO NOT
open the unit. Service and maintenance must only be undertaken by an authorised service agent.
7.1.1. Keep the unit clean by wiping with a soft, dry cloth. do not use abrasives.
7.1.2. ensure that the 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 an authorised service agent.
7.2.2. Keep cables and leads clean. do not use solvents.
7.3. Torch
7.3.1. Check torch regularly. Maintenance will depend on frequency and type of usage and is essential for correct
and safe use of 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. 6. Manually dismantle and assemble - never use tools to tighten nozzle components, hand tighten only.
7.4.
Safety cap
(fig. 6.8)
7.4.1. Clean safety cap and check to ensure that it is not damaged (including distortion,
burns, or cracks). If in any doubt, replace.
7.5. Nozzles
(fig. 6.6 & 7).
7.5.1. If surface is oxidised clean it with extra fine abrasive paper.
7.5.2. Check wear of the plasma arc hole and the inner and outer surfaces. If hole has widened,
or nozzle is damaged, replace it. The nozzle “V” crater should be 2mm in depth (fig. 7).
5.5. Air regulator
5.5.1. Unlock the air regulator knob by pulling it away from the unit (fig. 3.5).
Turn the regulator knob until the pressure gauge (fig.3.6) registers
65psi - 75psi (4.5 bar - 5 bar).
5.5.2. Push the air regulator knob towards the unit to lock it.
5.6. Energised torch (Clear light)
5.6.1. When the energised Torch clear light (fig 3.7) is illuminated the
cutting circuit has been activated resulting in either the pilot arc
or cutting arc being generated.
fig. 8
fig. 6
WARNING!
Before operating the machine ensure that you read, understand and apply Section 1 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. ensure that you have the compressed air connected correctly to the machine. (See Section 4).
6.1.2. Check that the earth cable is correctly clamped to the workpiece (see para. 5.2).
6.1.3. Switch on the mains power supply. Switch on the machine by operating the switch (fig. 3.1) on the front panel.
6.1.4. Set the range selector switch (fig. 3.4) to the the appropriate position for the task to be performed.
6.1.5. Press the torch button (0.5 seconds) causing air outflow for approximately 30 seconds - post gas.
6.1.6. Set the air pressure and check that the air gauge indicates the correct value (see para. 5.5)
6.1.7. Allow the air flow to continue to remove any condensation from the torch. The air flow will stop automatically.
6.2. Cutting workpiece
Note:
The torch will operate without being in contact with the workpiece. However, for greater cutting control and
accuracy, it is recommended that the torch be in contact with the workpiece.
6.2.1. Bring the torch nozzle into contact with the metal on the cutting line.
6.2.2. Press and hold down the torch button and the arc will ignite.
6.2.3. Move the torch slowly and smoothly forward along the cutting line at a steady speed.
6.2.4. Adjust cutting speed according to the thickness of the material to be cut and the selected current.
6.2.5. Check the underside of material. The arc (flame) should have a 5 - 10O tilt (fig. 4).
Note:
When the current is more than 40 amps (selector switch in position 2) the torch spacer must be fitted.
6.3. Cutting workpiece by piercing
6.3.1. To pierce thin material, place torch nozzle directly onto the point to be pierced and ignite the torch.
6.3.2 For thicker material, place torch nozzle at an angle, ignite the torch, then slowly and smoothly
bring the torch head to the upright position (fig. 5).
6.4. To stop the arc
6.4.1. Release the torch button to stop the arc. The post-air will continue to flow to cool the nozzle.
Note:
Other reasons why the arc will stop operating are:
a) If the distance between the torch nozzle and workpiece is too great.
b) If you have completed a cut and have continued beyond the edge of the workpiece.
c) The off-cut falls away from the workpiece thus increasing the gap.
6. OPERATING INSTRUCTIONS
fig. 4
fig. 7
fig. 5
Original Language Version
Pl120/1.V3 Issue: 2 - 09/03/10
