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7.6.
Air diffuser ring (fig. 6.5).
7.6.1. Check that the ring is not burned or cracked and that the air holes are not obstructed. If damaged, replace.
7.7.
Electrodes (fig. 6.3 & 4).
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 should be changed at the same time.
7.8.
Spacer (fig. 6. 2 & fig. 8).
The spacer (fig. 8) must be replaced if distorted or coated by scoria such that it is impossible to keep the torch in the correct position.
7.9.
Compressed air filter
The filter, fitted on the back of the unit, drains condensation from the air system, and must be kept clean.
7.9.1. Regularly Inspect the filter. If the glass bowl contains water, drain by pushing the drain plug upwards.
7.9.2. When the filter cartridge becomes dirty, replace. Clean the filter housing with soapy water only. do not use abrasives or solvents.
8. TROUBLESHOOTING
PROBLEM
Insufficient penetration or excessive
scoria settlement.
Interruption of cutting arc.
The torch is cutting at tilt when you wish
it to be perpendicular.
excessive wear of nozzle and electrode .
9. RATING PLATE
On the front of the plasma cutter is the rating plate, giving the following data:
1 - The european standard relating to the safety and construction of arc welding and plasma cutting equipment.
2 - Machine structure: Transformer-Rectifier.
3 - Symbol for plasma cutting.
4 - Power Supply: AC, 1 or 3-phase and frequency as specified.
5 - Rating of internal protection provided by casing.
6 - Output
U
: Maximum open-circuit voltage.
0
I
, U
: Current and corresponding normalised voltage.
2
2
X: duty cycle based on a 10 minute period. 30% indicates
3 minutes welding and 7 minutes rest, 100% indicates
continuous cutting.
A/V-A/V: Cutting current adjustment range and corresponding
voltages.
7 - Power Supply
U
: Rated supply voltage (allowed limits ±15%).
1
I
: Maximum current.
max
I
: Maximum effective current.
1eff
8 - Size of delayed action fuse to be provided for supply
protection.
9 - Serial Number. Specifically identifies each unit.
10 - S: Indicates that cutting may be carried out in environments
with a heightened risk of electric shock e.g. very close to large metallic objects.
11 - Symbols referring to safety.
10. ELECTROMAGNETIC COMPATIBILITY
10.1. THIS eQUIPMeNT IS IN CONFORMITY WITH THe eUROPeAN STANdARd ON THe eleCTROMAGNeTIC COMPATIBIlITY
OF ARC WeldING eQUIPMeNT ANd SIMIlAR PROCeSSeS (e.g. ARC ANd PlASMA CUTTING)
10.2. Protection against interference. (E.M.C.) The emission limits in this standard may not, however, provide full protection against
interference to radio and television reception when the equipment is used closer than 30m to the receiving antenna. In special cases,
when highly susceptible apparatus is being used in close proximity, additional mitigation measures may have to be employed in order
to reduce the electromagnetic emissions. At the same time there could occur some potential difficulties in having electromagnetic
compatibility in a non-industrial environment (e.g. in residential areas). Therefore it is most important that the equipment is used and
installed according to the following instructions.
10.3. Installation and use. The user is responsible for installing and using the equipment according to these instructions. If electromagnetic
disturbances are detected, then it shall be the responsibility of the user of the equipment to resolve the situation with the technical
assistance of the supplier. In some cases this remedial action may be as simple as earthing the circuit (see Note). In other cases it
could involve constructing an electromagnetic screen, enclosing the welding power source and the work, complete with associated input
filters. In all cases the electromagnetic disturbances shall be reduced to the point where they are no longer troublesome.
Note: The welding/cutting circuit may or may not be earthed for safety reasons. Changing the earthing arrangements should only be
authorised by a person who is competent to assess whether the changes will increase the risk of injury, e.g. by allowing parallel
welding/cutting circuit return paths which may damage the earth circuits of other equipment. Further guidance is given in IeC 974-13 'Arc
Welding equipment - Installation and Use.'
POSSIBLE CAUSE
Too high a cutting speed.
Torch is too tilted.
Workpiece is too thick.
electrode and nozzle are worn.
Cutting speed too low.
excessive distance between torch and workpiece.
electrode is worn out.
Intervention of the protections system.
Torch position not correct.
Asymmetric wear of nozzle hole and/or wrong
assembly of torch parts.
Air pressure too low.
Contaminated air (humidity/oil).
excessive pilot arc ignitions in the air.
Nozzle holder damaged.
Original Language Version
REMEDY
Slow the cutting speed.
Adjust the torch tilt.
Confirm workpiece thickness, and re-check technical data.
Replace electrode and nozzle.
Increase cutting speed.
decrease the distance between torch and workpiece.
Replace electrode and nozzle.
Check warning lights and take appropriate action.
Re-align the torch position.
Check assembly (see fig. 6) and change nozzle if
necessary.
Increase air pressure (see Section 5).
Check air supply system (see Sections 4, 5 & 7).
do not casually turn the torch on and off.
Change the nozzle holder.
Pl120/1.V3
Issue: 2 - 09/03/10
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