CHIEF MultiMig 521, Instruction Manual

7

press the key

 AV 

until the abbreviation 

«Au»

 reappears on 

the display  

AM

.

8- BB (Burn-back). 

The adjustment may range from 4 to 250ms. Serves to 

adjust the length of the wire leaving the contact tip after 

welding. The higher the number, the more the wire burns.

Manufacturer setting «

Au

» automatic.

If, once changed, you wish to return to the original settings, 

press the key 

AV

 until the abbreviation «

Au

» reappears on 

the display 

N

.

9- L (impedance).

The adjustment may range from 

-9.9 

to 

+9,9

. Zero is the 

number set by the manufacturer:if the number is negative, 

the impedance decreases and the arc becomes harder; if 

increased, it becomes softer.

10- dP  ( Double pulse)

This type of welding varies the current intensity between 

two levels and may be included in all synergic processes. 

Before setting, it is necessary to make a short bead to 

determine the speed closest to the type of welding that 

you will be doing. This determines the reference speed.

To activate the function proceed as follows:

A)- 

Activate the function by turning knob 

AN 

until the 

abbreviation 

On 

reappears on the display 

AM

.

B)- 

Turn knob 

AI 

fino uni tl the abbreviation 

FdP 

reappears 

(double pulse frequency) on the  display 

AL

. The display 

AM

 reads the abbreviation 

OFF

.

Turn the  knob

AN

 to select the working frequency 

(adjustment from 0.5 to 5 Hz). The selected value is shown 

on the display 

AM

.

C)

 Turn  knob

AI

 until the abbreviation 

ddP

 (difference in 

m/min of the double pulse) is displayed.

Turn the knob 

AN

 to select the meters per minute (range 

from 0.1 to 3m/min) that will be added to and subtracted 

from the reference speed (default 1m/min).

D)

Turn the knob  

 AI

 until the display  shows the the 

abbreviation 

tfP

. This is the duration of the highest wire 

speed, thus the highest current. It is expressed as a 

percentage of the time gained from the 

Fdp

 frequency 

(see figure 3).

DdP=

0,1÷3 m/min

tdP

T

= 25÷75% di

T

Fdp

= 1/

(0,5÷5 Hz)

=

=

Reference 

speed

Fig. 3

Turn knob 

AN

  to adjust the percentage. Range between 

25 and 75%  (default 50%).

E)-

Turn knob

AI  

unitl the display shows the abbreviation

AdP

(arc length of the highest current). Range between -9.9 

and 9.9%  (default 0).

When welding, check that the arc length is the same for 

both currents;  turn the 

AN

 knob to correct it if necessary.

Note: it is possible to weld within the double pulse 

functions.

Once these adjustments have been made, to return to the 

control panel normal display  briefly press key 

AE. 

Should it be necessary to adjust the arc length of the 

lowest current/lowest speed, adjust the arc length of 

the reference speed. When the reference speed moves, 

the previous settings must also be repeated for the new 

speed.

11- PP (push-pull).

By using Push-Pull torch (EL900005) function 

PPF

 (Push 

Pull Force) is enabled which adjusts the drive torque of 

the push-pull motor in order to make the wire feed linear. 

The adjustment may range from 99 to -99 and is done 

through knob 

AN

.. Standard adjustment is 0.

12- Ito. (Inching time out.

The purpose is to stop the welding machine if the wire 

flows after starting with no passage of current.

The  wire  flow  from  the  welding  torch  can  be  adjusted 

from 5 to 50 centimeters by means of knob 

AN

. When 

this function is restored, it may be activated   (

On

) or  cut 

off (

Off

).

13- Fac.  (factory).

The purpose is to return the welding machine to the 

original settings provided by the manufacturer. With the 

function selected, the display 

AM 

shows 

noP 

= restores 

the welding machine to the original settings  disregarding  

the stored programs, 

Prg = 

deletes all stored programs 

and 

ALL = 

restores the welding machine to the original 

settings.

To save the desired function  press  the button

 AV

, the 

abbreviation shown on the display 

AM

 will begin flashing; 

after a few seconds, a sound will confirm that it has been 

saved.

 6 INSTALLATION

The welding machine must be installed by skilled 

personnel. 

Do not place the welding machine on floor with inclina

-

tion greater than 10°.
Make sure that the supply voltage is 230V 50/60Hz and 
a minimum of 30 amp service. If connected to a circuit 
protected by fuses, use time dely fuse marked "D".Use a 
plug Nema type 6-30P for 230 V and make sure that the 
"

green conductor

" of the power supply cable is con-

nected to the ground or “earth” terminal.

6.1 PLACEMENT

The weight of the welding machine is approximately 

80 

Kg

. 

Position the unit  in an area that ensures good stability, and 

efficient ventilation so as to prevent metal dust (grinding) 

from entering.