amig AMIG-LST Series, Quick Instructions, Page: 36 / 37

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Table 5-2: Trouble shooting
6-CARE AND MAINTENANCE
Warning! An electric shock can be fatal. Before opening the machine:
-
Switch it off and unplug it from the mains
- Put up a clearly legible and easy-to-understand warning sign to stop anybody inadvertently switching it back
on again
- Check to make sure the electrically charged components (e.g.capacitors) have been discharged
- Bolts in outer case also work for ground connection. Never use other bolt that can not work for ground
connection

Maintenance of welding power source
Please follow the instructions as below to ensure normal use of power source
- Conduct safety check at regular intervals (see “Safety rules”)
- Dismantle machine side panels and clean machine inside with clean and low-pressure compressed air by
professional technician, not less than twice per year. Clean the components at a certain distance only
- If a lot of dust has accumulated, clean the cooling-air ducts

Maintenance of welding torch
- Torch nozzle may stain with some grain because of welding splash, long time use will influence protective gas flow
and welding, so clean in time.
- Welding contact tip is consumable, in order to ensure good welding result, replace every day before welding.
- Inner wall of torch wire feeding hose may stain impurity after long time using, if not clean, will influence wire feeding
smoothness and welding quality. Generally, after finishing using a reel of wire, use high pressure gas to clean wire
feeding system. If wire feeding resistance is still high, change wire feeding hose.
For water cooled welding torch:
-
Check the connections of water cooling system
- Check the coolant level, cleanliness of coolant etc. (clean coolant only)
-
Frequently check coolant’s back flow state
-
Welding
torch
cable
1. Cable broken: welding cable, torch
trigger cable
2. Loose connection with wire feeder or it is
damaged ○ ○ ○ ○ ○
1. Cable: overlay or serious curve ○ ○ ○ ○
Work
piece
cable
1. Cable standard: not enough sectional
area
2. Connection part is loose
3. Work piece is bad electric conduction ○ ○ ○
Work
piece
surface
Surface has oil, paint coating
○ ○ ○ ○ ○
Welding
conditio
n
1. Wrong welding current, voltage, torch
angle, welding speed or wire stick-out
length
2. Wrong welding program ○ ○ ○ ○ ○