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300 A torch suitable for wire from 1.0 to 1.2 mm
400 A torch suitable for wire from 1.2 to 1.6 mm
Mount the correct contact tube and gas cup on the welding torch
-
Put the wire spool on the wire feeder, so that the wire enters the wire guide from below.
-
Check if the drive wheels and pressure wheels correspond to the used wire diameter.
Release the pressure wheels by means of the lever.
Before entering the free wire end into the wire feed mechanism, it should be straightened over about 10 cm
(4 inches) from the end, to avoid every obstruction from the wire in the liner, the gun and the contact tube.
Fasten the pressure rolls by means of the lever.
-
Open the flow meter and regulate the needed gas flow
-
Switch on the power source with main switch (1).
-
Regulate the welding tension with button (10) on the power source or with button (2) on the wire feeder, or
-
with remote control.
Regulate the wire speed with potentiometer (1) on the wire feeder. For entering the new wire without gas
-
switch the selector switch (9) on the wire feeder to "wire" (= left). Pressing the torch switch will pass the wire
through the torch.
Note: leave the contact tube when entering the new wire. So the wire can not be blocked against the contact
tube. Once the wire comes out of the torch head, mount the correct contact tube and fix it.
Note: don't forget to move the selector switch (10) in the position "weld" otherwise you can not weld.
The Lastimig 550TH/750TH is now ready to weld
-
5.
TROUBLE SHOOTING AND REMEDIES
TROUBLE
1.
no current on the power source
2.
wire feeding motor does not turn
3.
nothing happens when pushing the
gun switch
4.
mains switch on the power source
does not function
5.
mains switch on the wire feeder does
not function
6.
no welding arc is formed
7.
stuttering arc when starting
8.
porosities in the weld bead
9.
weld bead is convex
Lastimig 550-750th/t0719-rev c0628/nfe/rc - 36
CAUSE
a)
line disconnect switch is open
b)
plug out of the receptacle
c)
fuses removed or blown
d)
wire disconnected in plug or receptacle
a)
fuse blown on the front panel
b)
printed circuit defect
c)
interruption in the intermediate cable
a)
cable not connected
b)
control wires in torch gun disconnected
c)
interruption in intermediate cable (on nr. 2
or nr. 6)
d)
micro switch defect
e)
printed circuit defect
f)
intermediate cable not connected
g)
fuse blown on the front panel
h)
line fuse blown
a)
selector switch internal/external on the
power source is in position external
b)
exchange of phases in the plug
a)
selector switch internal/external on the
power source is in position internal
b)
selector switch on the wire feeder
internal/external is in position external
(remote control)
c)
exchange of phases in the mains plug
a)
ground cable not connected
b)
wire/weld selector on the wire feeder is in
position "wire"
c)
interruption in intermediate cable
a)
soft-start regulation is not correct
a)
no gas or insufficient gas flow
b)
gas hose defective or obstructed
c)
dirty work piece (oil, grease, rust, paint)
d)
welding nozzle to far from the work piece
e)
gas nozzle is dirty or obstructed
a)
welding backwards
REMEDY
a)
close the switch
b)
plug into the receptacle
c)
replace fuses
d)
fix the wire
a)
replace fuse
b)
replace printed circuit
c)
repair or replace cable
a)
fix the cable
b)
check all contacts in the gun switch and fix
loosen wires
c)
check plugs and fix it. In case of defect
intermediate cable: replace
d)
replace micro switch
e)
replace printed circuit
f)
connect the intermediate cable
g)
replace fuse
h)
replace line fuse
a)
change position of switch
b)
change the 2 phases
a)
change position of the switch
b)
change position of the switch
c)
change the 2 phases
a)
connect the ground cable
b)
put the switch into position "weld"
c)
check plugs and fix it. In case of defect
intermediate cable: replace
a)
adjust
a)
open the gas cylinder completely, regulate
flow (7-20 l/min)
b)
replace gas hose and check all connections
for tightness
c)
clean work piece
d)
hold the welding gun closer to the work
piece
e)
clean the nozzle
a)
weld forwards
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