WELDMAX
- 7
-
MIG S
(3-phase)
+ SWF 2
The machine is controlled by an
electronic unit
which provides the
feeding motor's DC voltage, switches the
contactor
and
gas valve
on/off
and controls the welding process.
•
Green LED: signals the machine's on.
•
Yellow LED: signals the overheating of the
power source
.
•
K: Function selector switch.
•
P4: Wire feed speed potentiometer.
•
P7: Welding
on
time potentiometer.
•
P8: Welding
off
time potentiometer.
•
P1: Wire burn back (mini) potentiometer.
•
P2: Gas post-flow time (mini) potentiometer.
Two operation modes which can be chosen by the switch K are:
Wire threading
: While
pushing
the torch button, the feeder is
feeding
the wire with speed approx. 10 m/min. into the torch cable (any other functions are prohibited). For
smooth wire feed, keep torch cable as
straight
as possible during this operation. In case of
slippage
of the wire, increase drive roll pressure by the set screw.
Gas test
: While
pushing
the torch button, the gas valve is
open
(any other functions are
prohibited). During this time the quantity and the pressure of gas can be checked and set. Set gas
flow between approx. 16-20 l/min (
depending
on the welding current).
The welding can be started by pushing the button on the welding torch:
•
First there is only
gas pre-flow
(its duration can be 0-0.5 sec., setting by P3 potentiometer on the PCB);
•
Afterwards the
wire feeding
begins, with soft start (its duration is set to 0.2 sec. by P9 on PCB), and also the
welding current
starts.
The welding work is according to the operation modes set by the function selector switch (K):
4-stroke
mode: Releasing the button the welding
continues
and it stops only if the button is pushed
again.
2-stroke
mode: After releasing the button, the welding
stops
.
Spot welding
: After the set time is finished (or releasing the button), the welding stops. The
duration of the spot welding can be set by P7 potentiometer (0.5-2.5 sec).
Interval welding
: The welding stops if the button is
released
in the pause time. The duration of the
feeding
can be set by P7, while the
pause
time can be set by P8.
When the welding is finished:
•
First the
wire feeding
stops (if it works);
•
Elapsing the wire burn back time (P1), the
welding current
ceases;
•
Elapsing the gas post-flow time (P2), the
gas flow
stops, too.
The P6 potentiometer
on the PCB
sets the minimal wire speed, while the P5 sets the maximal one.
6. Trouble shooting
All repair works are needed to be carried out by a
technician
, on
disconnected
machine!
If the fault of the equipment remains or is caused by an
unknown
reason, contact the service division!
•
The green LED is off:
Faulty switch (Q1), mains cable or transformer(s);
⇒
replace it or contact the service.
Bad electric connections to the
power source
;
⇒
check
these cables.
•
Blown fuse:
⇒
Find the
cause
of trouble (short circuit may be inside!), replace fuse and
check
its rating.
•
The yellow LED is on:
The
power source
is overheated;
⇒
wait
until the fan cools it down and the LED
extinguishes.
•
No welding arc:
Faulty torch or its cable or button;
⇒
replace
it. Loose connection at welding cables;
⇒
fasten
it. Faulty control unit;
⇒
contact service.
M I G / M A G P o w e r S o u r c e w i t h s e p a r a t e W i r e F e e d e r
Green
LED
Yellow
LED
K
P7
P1
P2
P8
P4
1
2
3
4
5
6
7
9
8
10
PROGRAMME
S
S
0,5
1,5
2,5 sec.
0,5
1,5
2,5 sec.
WELD
