CHIEF MultiMig 521, Instruction Manual

8

6.2 ASSEMBLY

Mount the plug on the power cord, being especially 

careful to connect the yellow/green conductor to the earth 

pole. Make sure that the supply voltage corresponds to 

the rated voltage of the welding machine.

Size the protective fuses based on the data listed on the 

technical specifications plate.

This welding machine has been designed to 

contemporarily mount 2 welding torches and 2 coils of 

wire having a  diameter of 300mm; this machine cannot 

weld with the 2 torches at the same time, the torch 

selection is made by means of selector switch 

D

.

The gas cylinder must be equipped with a pressure 

regulator and  a gauge. If the cylinder is placed on the 

cylinder shelf of the trolley, it must be fastened using 

the strap provided. Only after positioning the cylinder, 

connect the outgoing gas hose from the rear panel of the 

machine to the pressure regulator.

2 gas hoses leave the rear panel, one is used in 

combination with central adapter 

B

 and the other one 

with central adapter 

B1

. In order to select the right 

combination read the plate at its side.

Adjust the gas flow to approximately 8/10 liters/minute

To make sure that the groove of the roller matches the 

wire diameter used, open the mobile lateral side, remove 

the cover 

CA

, release the  wire press roller by means of 

the pressure adjusting knob 

BN

, replace the roller and 

remount  the cover 

CA

. (See fig.4).

BN

CA

Fig. 4

Mount the wire coil and slip the wire into the feeder and 

welding torch sheath.

Block the wire press roller with the 

knob 

BN and adjust 

the pressure.

Turn on the machine.

Adjust the gas by means of key 

AY

 and then feed the wire 

by means of key 

AW

.

NOTE:

 If 0.6mm diameter wires are used the welding 

torch sheath should be replaced with one of suitable 

internal diameter.

If the internal diameter of the sheath is too big it does not 

guarantee smooth wire feeding.

7 WELDING

Welding 

Synergic Pulsed MiG 

 LED 

AP 

on.

Select the 

PRG 

number based on the wire diameter to be 

used, the type and quality of the material, and the type of 

gas, using the instructions located inside the wire feeder 

compartment.

Set the functions in the submenu according to the 

instructions under paragraph «

Service functions

».

5.2.3The welding parameters are set by means of knob

AI

.

Synergic 

 MiG Welding 

LED 

AQ 

on.

Select the 

PROG 

number based on the wire diameter 

to be used, the type and quality of the material, and the 

type of gas, using the instructions located inside the wire 

feeder compartment.

Set the functions in the submenu according to the 

instructions under paragraph «

Service functions

».

Adjust  the wire speed and the welding voltage using the 

knob 

AI.

Conventional 

 MiG

 Welding 

LED 

AR 

on.

Select the 

PROG 

number based on the wire diameter 

to be used, the type and quality of the material, and the 

type of gas, using the instructions located inside the wire 

feeder compartment.

Set the functions in the submenu according to the 

instructions under paragraph «

Service functions

».

Adjust  the wire speed and the welding voltage using the 

knob 

AI. 

and 

AN 

  respectively.

 8  MAINTENANCE  

Any maintenance operation must be carried out by 

qualified personnel in compliance with standard IEC 

60974-4.

8.1  GENERATOR MAINTENANCE

In the case of maintenance inside the machine, make sure 

that the switch 

L

 is in position “O” 

and that the power 

cord is disconnected from the mains. 

It is also necessary to periodically clean the interior of 

the machine from the accumulated metal dust, using 

compressed air.

8.2   

PRECAUTIONS AFTER REPAIRS.

After making repairs, take care to organize the wiring so 

that there is secure insulation between the primary and 

secondary sides of the machine. Do not allow the wires 

to come into contact with moving parts or those that heat 

up during operation. Reassemble all clamps as they were 

on the original machine, to prevent a connection from 

occurring between the primary and secondary circuits 

should a wire accidentally break or be disconnected.

Also mount the screws with geared washers as on the 

original machine.