Maintenance; Troubleshooting - ARC 793 Bedienungsanleitung

A) Main selector switch:
Turns the machine on or off. The voltage change disk
is located beneath the knob.
B) Complete handle.
C) Setting indicator:
Indicates the welding current to which the machine is
set.
D) Welding current adjustment knob:
Turn this knob clockwise to increase the current
intensity, or counter-clockwise to decrease.
E) Positive terminal.
F) Negative terminal.
G) On-light:
Indicates that the machine is running.
Before using this welding machine, carefully read the
regulations CENELEC HD407 and CENELEC HD 433.
Also make sure that the insulation on cables, torch and
earth cable is intact.
Remember! Switch machine off when not in use.

4 MAINTENANCE

WARNING: All servicing repair must be done by qualified
personnel.
Before opening the machine case to service or repair, turn
the machine off and disconnect the plug from the power
supply.
Keep the welding cables, the electrode holder, and the
earth clamp in good condition.
Periodically clean inside the machine blowing dust and dirt
away from internal components with a light jet of dry air.

5 TROUBLESHOOTING

•
The machine does not turn on :
→ Input power cord no plugged in.
→ One power supply phase missing.
•
The machine switches on but does not supply
current :
→ Welding accessories not connected.
→ Machine not connected to the right supply
voltage.
•
The line fuse blow :
→ Installed line power insufficient.
→ Machine not connected to the right supply
voltage.
→ Power transformer in short circuit.
•
Welding current unstable or incorrect :
→ Primary or secondary connections incorrectly
fitted.
→ Inadequate electrode.
→ Welding cables not properly tightened to the
output terminals or false contacts in connections.
→ Machine not connected to the right supply voltage.
•
The fan does not work but the output
current is correct:
→ Defective fan motor.
→ Interruption in the leads that supply power to the
fan motor.
→ Fan motor fuse blown.
welding
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