Tweco 220 VAC 50Hz Drag-Gun - Manual (Page 22)

DRAG-GUN Plasma Cutter (Australia) 18 Operating Manual 0-2737
6.2 Power Supply Cleaning 6.2 Power Supply Cleaning 6.2 Power Supply Cleaning 6.2 Power Supply Cleaning 6.2 Power Supply Cleaning
To clean the unit, open the enclosure and use a vacuum
cleaner to remove any accumulated dirt and dust. The
unit should also be wiped clean. If necessary, solvents
that are recommended for cleaning electrical apparatus
may be used. Do not blow air into the power supply dur-
ing cleaning. Make sure to always blow air out of the unit.
Blowing air into the unit can cause metal particles to in-
terfere with sensitive electrical components and cause
damage to the unit.
6.3 T 6.3 T 6.3 T 6.3 T 6.3 Tor or or or orch Cleaning ch Cleaning ch Cleaning ch Cleaning ch Cleaning
Even if precautions are taken to use only clean air with a
torch, eventually the inside of the torch becomes coated
with residue. This buildup can affect the pilot arc initia-
tion and the overall cut quality of the torch.
The inside of the torch should be cleaned with electrical
contact cleaner using a cotton swab or soft wet rag. In
severe cases, the torch can be removed from the leads
and cleaned more thoroughly by pouring electrical con-
tact cleaner into the torch and blowing it through with
compressed air.
CAUTION
Dry the torch thoroughly before reinstalling.
6.4 Inspection and Replacement 6.4 Inspection and Replacement 6.4 Inspection and Replacement 6.4 Inspection and Replacement 6.4 Inspection and Replacement
of Consumable T of Consumable T of Consumable T of Consumable T of Consumable Tor or or or orch Parts ch Parts ch Parts ch Parts ch Parts
WARNING
Disconnect primary power to the system before
disassembling the torch.
CAUTION
Consumable parts may be HOT! Torch parts may
get quite hot during normal operation. Always
wear light cutting gloves when changing torch
parts just after operating the Drag-Gun system.
1. Remove the shield cup from the torch and inspect the
cup for damage. Wipe it clean or replace if damaged.
Torch Head Assembly
Electrode Tip
Standard
Shield Cup
Gas
Distributor
PCH-10
A-02007
Figure 6-2 Consumable Torch Parts
2. Remove the tip. Check for excessive wear (indicated
by an elongated or oversized orifice). Replace the tip
if necessary.
NOTE
The following may also indicate a worn torch tip:
• reduced speed
• voltage drop
• crooked cut
3. Remove the electrode. Refer to Figure 6-3 and check
the electrode for excessive wear. The face of the elec-
trode should not be recessed more than 1/8" (3.2 mm).
If the electrode is worn beyond this point it must be
replaced.
New Electrode
Worn Electrode
A-01270


Figure 6-3 Electrode Wear
4. Install the electrode, gas distributor, tip, and shield
cup in the torch body.
CAUTION
Do not overtighten the shield cup.
5. Hand tighten the shield cup using a slight twisting
motion until it is properly seated on the torch head. If
resistance is felt when installing the cup, check the
threads and parts configuration before proceeding.