Helvi UNIMIG 298+T2E Manual De Uso página 34

1 Main ON/Off switch.
machine is switched on.
2 Welding voltage selector switch.
switches)
3 Welding voltage selector switch.
4 Wire speed control knob.
5 Timer for spot welding.
This potentiometer permits the adjustment of the spot welding time; you can produce welding spots or
beads, which will automatically stop according to the time you have set. To activate the timer, turn it
clockwise; to deactivate it turn it counter-clockwise, until you hear a "click".
6 B.B.T. (Burn Back Time)
When releasing the torch trigger the machine will work for a very short time. This function allows avoiding
the burning of the wire and the consequent sticking of this to the contact tip. By turning the B.B.T. potentio-
meter clockwise/counter-clockwise, the wire which is exiting from the torch at the end of the welding will
become shorter or longer. In some models with separate wire feeder the B.B.T. potentiometer is placed
in the spool holder compartment of the wire feeder (above the wire feeder motor).
7 Over temperature pilot lamp (orange).
This pilot lamp will light if the over temperature thermostat operates. During an over temperature
condition, the output of the power source will be disabled, but the fan should continue to operate to cool
the machine. The pilot lamp will automatically extinguish after the machine has cooled sufficiently. Then,
you will be able to work again.
8 Power on led (green).
9 Auxiliary circuits protection fuses.
In some models with internal wire feeder the fuses are placed in the spool holder compartment, above the
wire feeder motor. In some models with separate wire feeder the fuses are placed inside the generator.
10 Torch connection
11 Negative terminal (
connection point for the ground cable: low impedance is suggested for thin welding wires.
12 Negative terminal (
connection point for the ground cable: low impedance is suggested for thick welding wires.
13 Digital instrument.
Some models just have the ammeter, while some others have both ammeter and voltmeter. In some models
with separate wire feeder, after welding, the display will show (for a few seconds) the real welding current.
14 Manual / automatic selector.
- manual=
2 times welding:
stops when we release it.
- automatic=
4 times welding:
a pre-gas time) and continues even if we release the torch trigger; the process stops when you press and
release again the torch trigger (after a post gas time).
15 Positive terminal.
16 Six poles connection.
17 Gas hose connection.
18 Generator power cable
19 ON/Off switch.
powered.
20 Missing cooling fluid.
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Generator main switch. In some models, this green led lights up when the
Turn it to increase or decrease the wire speed.
It lights on when the generator is powered.
(Euro connection or direct connection)
) low impedance.
the welding process starts when we press the torch trigger and
the welding process starts when we press the torch trigger (after
Connection point for the power cable of the interconnection cable.
Connection point for cable interconnection 6 poles connector.
Connection point for the gas hose of the interconnection cable.
Cooling unit main switch. This green lamp lights on when the cooling unit is
6-7-8 positions (fine selector switch for models with 2
2-3-4-6 positions (coarse selector switch)
) high impedance.