Selco Unistep 3500, Instruction Manual

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The power source supply cable is provided with a yellow/
green wire that must ALWAYS be earthed. This yellow/green
wire shall NEVER be used with other voltage conductors.
Verify the existence of the earthing in the equipment used
and the good condition of the sockets.
Install only certified plugs according to the safety regula-
tions.
2.4 Installation
Connection for MIG/MAG welding
- Connect the power cable to the appropriate outlet (1).
Insert the plug and turn clockwise until all parts are secured.
- Connect the signal cable to the appropriate connector (2).
Insert the connector and screw the ring nut clockwise until all
parts are secured.
- Connect the gas hose (3) to the pressure reducing valve of the
cylinder or to the gas supply connection.
- Connect the water pipe (4) (blue colored ) to the outlet
quick connector of the cooling unit.
- Connect the water pipe (5) (red colored ) to the inlet
quick connector of the cooling unit.
3 SYSTEM PRESENTATION
3.1 General
The semiautomatic UNISTEP Series systems for continuous wire
welding in MIG/MAG ensure high performance and quality in
welding with solid and core wires.
The static characteristic of the power source is constant voltage
with step adjustment of the welding voltage; the different
inductance outputs that can be selected enable the operator to
set optimal power source dynamics for welding.
These welding power sources feature an innovative “SYNERGY”
operating mode.
Synergy enable with setting of the type of material to be welded
and diameter of the wire used permits automatic wire speed
definition, simplifying system welding adjustment operations.
3.2 Front control panel
1 Power supply
Indicates that the equipment is connected to the mains
and is on.
2 General alarm
Indicates the possible intervention of protection devices
such as the temperature protection.
3 Power on
Indicates the presence of voltage on the equipment
outlet connections.
4 Primary power selector switch
Switch with 2/3 positions for switching on and adjust-
ment of the principal ranges. In a position other than 0
the equipment power supply is on (pos. 0 = power
source off).
Never touch the switch while you are welding!
5 Secondary power selector switch
Switch for adjustment with up to 10 positions.
For both switches, the output voltage increases with the
position number.
Never touch the switch while you are welding!