CEA DIGITECH 400 PULSED Operator'S Manual Download Page 34

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Adjustment from generator or wire-

feeder

The DIGITECH 400 PULSED has a system for adjusting param-
eters by moving the encoder knobs on the front panel of the ma-
chine (generator adjustment) or the potentiometer knobs on the
front panel of the wire-feeder (wire-feeder adjustment).
The wire-feeder adjustment is the standard adjustment used for
machines coming out of the factory.
Press the combination of keys given below to change to GEN-
ERATOR ADJUSTMENT (encoders ACTIVATED - potentiometers
NON-ACTIVATED):
• Press and release the SPECIAL FUNCTIONS key;
• Press and release the (-) negative PROGRAMME SCROLLING

key;

• Press and release the SPECIAL FUNCTIONS key.
Press the combination of keys given below to return to the WIRE-
FEEDER ADJUSTMENT (encoders NON-ACTIVATED -
potentiometers ACTIVATED):
• Press and release the SPECIAL FUNCTIONS key;
• Press and release the (+) positive PROGRAMME SCROLLING

key;

• Press and release the SPECIAL FUNCTIONS key.

Viewing installed software versions

The DIGITECH 400 PULSED has a digital control with software on
board produced in the factory. This software is subject to continu-
ous innovation and improvement. A number/specific version dis-
played on the PROGRAMME DISPLAY identifies the software of
each circuit board in the following way:
• FRONT PANEL CPU DIGITAL CIRCUIT BOARD

Start up the welder by turning the switch on the back panel to 1,
press the SPECIAL FUNCTIONS key then the RUN/MEM key.

• FRONT PANEL DIGITAL CIRCUIT BOARD

Start up the welder by turning the switch on the back panel to 1,
press the SPECIAL FUNCTIONS key then the GAS TESTING
key.

• TA4 PANEL CIRCUIT BOARD

Start up the welder by turning the switch on the back panel to 1,
press the SPECIAL FUNCTIONS key then the WIRE TESTING
key.

Before welding

WARNING:

Before welding, check that the data on the power

source plate correspond to the supply voltage and frequency.

• Make sure the wire-feeder is properly connected to the welder

by the interconnection cable;

• Start up the welder by turning the switch on the back panel to 1

(N.B.: the machine will display the last settings made before it
was switched off when it is turned on again);

• Set the various units according to the chosen welding process.

Welding procedures

ELECTRODE WELDING
For coated electrode welding with devices that can be adjusted
from the user's "arc force" (adjustable with the V- PARAMETERS
SELECTION key) and "hot start" (adjustable with the SPECIAL
FUNCTIONS key).
You can access this welding mode by pressing the WELD PROC-
ESS key and then turning to MMA

Connect up the welding cables following description in paragraph
"Connecting up welding - ELECTRODE welding cables (fig. B)".

WARNING:

Do not lay down the torch on live parts connected to

the earthing cable while the wire-feeder is connected up to the
welding unit by the interconnection cable.

Welding parameters

Table 4 shows the values of current to use with the respective
electrodes for the welding of common steels and low-grade alloys.
These data have no absolute value and are indicative data only.
For a precise choice follow the instructions provided by the elec-
trode manufacturer. The current to be used depends on the weld-
ing positions and the type of joint, and it increases according to the
thickness and dimensions of the part. The current intensity to be
used for the different types of welding, within the field of regulation
shown in table 4 is:
• High for plane, frontal plane and vertical upwards welding;
• Medium for overhead welding;
• Low for vertical downwards welding and for joining small pre-

heated pieces.

A fairly approximate indication of the average current to use in the
welding of electrodes for ordinary steel is given by the following
formula:

I = 50 x (Øe – 1 )

where: I = intensity of the welding current
Øe = electrode diameter
Example: for electrode diameter 4 mm

I = 50 x (4 –1 ) = 50 x 3 = 1 50A

The pre-set values of the welding current

(adjustable with

ENCODER 1 knob) and open-circuit voltage (not adjustable) or of
the "arc force" (adjustable with the ENCODER 2 knob - if selected)
will be displayed on the A- PARAMETERS Display (abbreviated in
dVPA) and V - PARAMETERS Display (abbreviated in dVPV) be-
fore welding starts.
The values of the welding current

being used for welding (ad-

justable with the ENCODER 1 knob) and the welding voltage
or the "arc force" (adjustable with the ENCODER 2 knob - if se-
lected (on a scale of values varying between 0 and 100 (absolute
value) with an adjustment interval at 1 - a parameter that increases

Ø ELECTRODE

(mm)

1,6

2,4
3,2

4,8
5,6
6,4

6010
6011

-
-

40-80

75-125

110-170

140-215
170-250
210-320
275-425

6012