LGK-40/63IGBT OPERATOR’S MANUAL
14
the back panel to make the pressure and flux fit cutting condition. After adjusting, set the
switch to Cutting position.
5. Set the cutting current to required value.
6. Let the nozzle axes plumb the workpiece and cling to it firmly, press down the torch switch
and start to cut by striking arc from the edge of workpiece. To punch hole by plasma arc in
the middle of workpiece is not proposed, because the nozzle would be damaged easily. It is
better to punch a hole in the arc-striking position first, then strike arc from the edge of the
hole.
7. If want to stop cutting, please loosen the torch switch, cutting arc extinguishes, and gas
supply will stop in 5-8S automatically.
Operation Caution
1. Before operation, operator must put on insulating shoes and wear insulating gloves &
protection glasses. The earth line must be connected reliably.
2.
If to use contact arc striking method, firstly press down torch switch, then have nozzle
contact workpiece edge quickly, this will be beneficial for arc striking cutting. If it is difficult
to strike arc, the gas pressure can be adjusted to lower limit.
3.
The water in reducing valve and air compressor should be drained out frequently. The
cutting speed should not be too fast, so that it can avoid molten slag and arc reflection
caused by incomplete cutting, but the cutting speed should not be too slow too, it will have
workpiece red-hot and affect cutting quality. When the cutting stops, firstly loosen torch
switch, then lift up torch. To follow above can have nozzle work life improved a lot.
4. The status of gas pressure, voltage, electrode and nozzle should be observed closely during
cutting. Do not have electrode and conductive tip short circuit caused by copper spraying
after using up hafnium wire in electrode, and damage cutting torch. The hafnium wire in
each electrode is about 3mm in length. After nozzle aperture is enlarged, cutting quality
and thickness will decrease seriously, so the nozzle must be replaced immediately.
5. If the cutting seam is deviated seriously, the nozzle must be checked if it flanges and
deviates. Or the nozzle and electrode must be replaced. Notice: the roughness of cutting
surface is related to cutting plate surface. If the plate surface is rough and not clear, cutting
moving is uneven, then the incision is big and surface quality decreases seriously.
6. The work life of electrode and nozzle is related to plate thickness and operation technology.
Normally every electrode can keep using for 1 hour continuously.
Maintenance
1. The cutter cannot be operated and placed in strong sunshine.
2. The cutter cannot be operated and placed in moist environment.
3. The vent hole should not be covered when the cutter is operated.
4. The cutter should be operated and placed in drafty environment.
5.
The cutter casing should be opened once a year at least. Clean up the dust and metal scraps
inside the machine by use of compressed gas.
6.
Check regularly if the cable insulation cover is damaged. If there is any damage, repair it or
change it.
7. Check regularly if the electric connection is loose and then tighten it.
Содержание LGK-40/63IGBT
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