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5. CONTROL INSTRUCTIONS
F WARNING! before operating the machine ensure that you read, understand and apply chapter 2 safety instructions. Ensure the machine is
disconnected from the power supply before moving or changing accessories.
5.1.
Locating the Machine.
5.1.1. Ensure your work area has a good airflow and that there is no dust, smoke or gas present.
5.1.2. Ensure that there is a minimum clearance of 500mm around the machine, and there are no obstacles to prevent a cool air flow.
Also check to ensure the front outlet and rear inlet grills are not blocked.
5.1.3. When moving the machine disconnect the unit from the mains power supply, and gather all cables safely.
5.2.
Connecting the Earth cable.
Connect the work cable clamp to the piece to be cut or to the metallic workbench as follows:
5.2.1. Check that there is a good electrical contact. Caution: Ensure you have made good contact on oxidised or insulate coated sheets.
5.2.2. Make the Earth connection as close to the cutting area as possible.
5.2.3. DO NOT use metallic structures or objects to make contact (i.e. return cable), other than the metallic workbench which is holding
workpiece. To do so may endanger the system safety and will give a poor cut.
DO NOT make Earth connection to the off cut, or piece that will be removed.
5.3.
Connecting the Plasma Cutter.
5.3.1. Insert the male connector of the torch into the connector on the lower front panel of the machine ensuring that the black
spigot (2) is uppermost and aligned with the matching slot in the connector as indicated in fig.4.
5.3.2. Screw the ring nut (1) tightly clockwise to ensure air flow without leaks.
5.3.3. Before cutting, check the head of the torch to ensure it is correctly assembled.
5.4.
ON / OFF Switch.
The on/off switch is located at the rear of the machine (fig 3.1). When
the switch is in the “O” position the machine is turned off. When switched
to the “I” position the machine is turned on and the switch will illuminate.
A green LED will also show on the front panel (fig.2-8) indicating that
mains power is present and the machine is in the ‘ready’ condition. The
control and duty circuits are now live but the torch will remain in a
‘stand-by’ mode until the torch button is pressed.
5.5.
The Cutting Regulator.
The cutting current is regulated by the knob/potentiometer on the front
panel (fig.2-2). This control regulates the supply of current required in
order to cut different thicknesses of metal at different rates of progress.
5.6.
Air Pressure Gauge
5.6.1. Check torch and determine the pressure required for the job in hand.
5.6.2.
Unlock the pressure regulator knob by pulling it upwards (fig 3.3). Flick
switch (fig.2.9) down and turn the regulator knob until the required “psi”
value registers on the pressure gauge (fig.5-4).
5.6.3. Push the pressure regulator knob downwards to lock it.
5.7.
The Torch Control.
When the machine is turned on the green indicator light (fig.2-8) will
show that the torch is in a “Stand-By” mode.
5.7.1. When the torch button is pressed the machine is activated and a yellow
LED will illuminate (fig 2.5) indicating the presence of the pilot arc.
5.7.2. As a safety feature, should the following situations arise the torch will
automatically de-activate.
a) During PREAIR (0.3s) and POSTAIR (>30s) phases.
b) If the pilot arc is not moved to the workpiece within 2 seconds.
c) If the cutting arc is interrupted because it is held too far from the
workpiece, or the electrode is worn out,
or the torch has been forced away from the workpiece.
d) Should an alarm sound indicating a mains voltage fluctuation or
overheating.
5.8
The Thermal Switch & Mains Voltage Fault.
If the red LED on the front panel illuminates (fig.2-6) and an alarm sounds this indicates a mains voltage or thermal problem and the
machine will be automatically shut down as a result of one of the following :
a) The power transformer has overheated.
b) There has been a decrease or increase in the mains voltage power supplied to the machine.
When the safety switch is activated in this way the problem is normally self rectifying, and within a few seconds the switch will re-set
and the red LED will go out. The machine is now ready to use once again.
5.9
Air Pressure Fault Signal.
If the alarm sounds together with the illumination of the yellow LED (fig.2-7) and the red LED (fig.2-6), this will indicate that air pressure
is too great or too low and the machine will automatically stop operating.
Make any necessary adjustments to the air pressure.
Once the air pressure is correct the fault signal will return to normal, the LED displays will go out, and the machine is ready to use again.
5.10.
Technical Data. Please refer to the explanation of the ratings plate symbols given in Section 9.
5.11.
The Torch
Although the machine and torch may be fully powered, the torch button is the only device that will activate the cutting process.
5.11.1. To turn the cutting process on, the torch button must be fully depressed
5.11.2. Release the button and the cutting cycle will stop immediately. The cooling air (post-air) will continue to function.
NOTE: To minimise the possibility of accidental starting, the on button must be pushed for at least 300 milliseconds before the cutting operation will start.
fig 3.
fig 5.
fig 2.
fig 4.
PP40.V3 - 4 -101103
PP40.V3 - 4 -101103
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