Unitor UPC 1041, Instruction Manual

Page: 9 / 46

Revision date: 120813 Page 9 of 46
6. TROUBLE SHOOTING.
Thermal overload.
If the air pressure is correct but the green ready lamp is not lit the power source is overheated
and needs to cool down before it can be used again. Let the machine cool down while
switched on until the ready lamp lights up.
Please note that the UPC-1041 plasma cutter is equipped with an active fan control which will
run the fan until the machine is cooled down to a safe level.
Here is a small description how it works:
The Active fan control will switch on the fan when the operator switches on the machine in
order for the operator to hear that the machine starts up, if the operator doesn’t start a cutting
cycle within 5min the machine will switch off the fan.
When the operator activates the torch the Active fan control will start the fan and keep it
running during the whole cutting cycle and 5min after in order to cool the machine, if the
operator doesn’t reactivate the torch during these 5min the fan switches off.
If the operator activates the torch within the 5min the Active fan control will reset the timing
and when the operator stops the cutting cycle the fan will again run for 5min.
As an added protection the Active fan control senses the temperature on the main transformer
via a thermistor, if the transformer is still warm after the 5min time cycle the fan will keep
running until the transformer has reached a preset temperature.
Torch malfunction.
If the pilot arc does not strike:
- Change nozzle, electrode and electrode insulator.
- Check, and if necessary, adjust inlet air pressure on the rear of the machine
to 5 bar.
- If possible, measure gas flow through the nozzle while the post flow function
is active. The flow should be approx. 20-28 l/min.
If the pilot arc is not stable:
- Too high gas flow. Adjust inlet pressure to 5 bar.
If possible measure the flow through the nozzle.
- The machine is working two-phase. Check mains fuses.
Inferior performance or cutting quality:
-
Check consumables.
- Inspect the torch body and hose assembly for damage.
- Check the return clamp connection.