LORCH M 2020, Operation Manual

Page: 10 / 12

10
12 Troubleshooting
Symptom Cause Remedy
Torch too hot contact tip is not tight check it
No function when torch
button is pressed nut of the torch hose is not tight tighten it
no connection of the control cable in the torch hose. check and change if necessary
overload of the machine and thermal protection is in
function (control lamp
39 indicates overload)
allow machine to cool down at no load
Irregular wire feeding or
wire welds to the con-
tact tip wire electrode is tight at the spool check and change if necessary
burr at the wire beginning cut the wire beginning again
Irregular wire feeding or
no wire feeding wrong contact pressure at the wire-feed rolls adjust it as described in the manual
torch defect check and change if necessary
no brass pipe in the central connection or is dirty install or clean the brass pipe
bad quality of welding wire check and change if necessary
rust formation at the welding wire check and change if necessary
torch liner is dirty inside disconnect the torch from the machine, screw
off the contact tip and clean the liner with com-
pressed air
torch liner is dejected check and change if necessary
motor brake adjusted to strong adjust as described in the manual
main rectifier defective check and replace, if required
Machine switches off duty cycle overloaded, control lamp 39 indicates
overload
allow the machine to cool down
to less cooling of machine parts check the air in and outlet
Arc or short circuit be-
tween contact tip and
gas nozzle spatter built up inside the gas nozzle remove it with special pliers
Unstable arc wrong diameter of contact tip or worn out change contact tip
No function of fan phase missing in the mains check machine at another socket and check
mains and fuses
Mains control lamp 40
does not light
phase missing in the mains check machine at another socket and check
mains and fuses
No shielded gas gas cylinder empty replace it
defect torch check and replace it
pressure reducer dirty or defect check and replace it
valve of gas cylinder defect replace the gas cylinder
Shielding gas switches
not off valve of gas cylinder dirty or does not close remove torch and pressure reducer and clean it
with compressed air
Not sufficient shielded
gas wrong adjusted quantity of shielded gas adjust right as described in the manual
dirty pressure reducer check valve
torch, gashose blocked or not air-tight check and change if necessary
shielded gas is blow away from draught avoid draught
Less welding perform-
ance phase missing check machine at another socket and check
mains and fuses
poor ground connection ensure best contact between ground clamp
and workpiece
ground cable not right plugged in fasten ground cable by turning the plug to the
right
defect torch repair or replace it
main rectifier defective check and replace, if required
Hot plug of ground cable plug was not tightened by turning to the right check
Higher wire wear out at
wire-feeding unit wire rolls does not fit to the wire diameter install right wire rolls
wrong contact pressure at wire feeding adjust as described at the manual