CEA MATRIX 250 AC/DC Manual De Instrucciones página 28

5) Remove top by lifting with both hands.
Proceed vice versa for assembly.
Procedure for welder assembly
and disassembly
• Unscrew the 4 screws fastening the front rack panel.
• Remove control dials.
• Extract wiring connectors from electronic control board.
• Unscrew small supporting columns.
• Remove electronic control board by lifting it out of its sup-
ports.
• Proceed vice versa to assemble new electronic control
board.
Special functions
The MATRIX 250 AC/DC allows some welding parameters to
be modified, thus providing a more versatile welding machine
for more expert welders.
Two special functions are provided for welders:
• Changing the minimum and maximum limits of parameters;
• Activation of special parameters (only valid for the TIG 'weld-
ing process' with HF ignition).
CHANCING THE MINIMUM AND MAXIMUM LIMITS OF
WELDING PARAMETERS
1) With the welding machine switched off, press
and hold down the SET button
2) Start up the welder by turning the main switch to position I
3) Press the SET button in sequence to modify
the upper limits of the following welding
parameters:
• PRE-GAS time (maximum settable limit from 1.00 to 2.50
sec)
• SLOPE UP time (maximum settable limit from 5.00 to 10.0
sec)
• remote control MINIMUM CURRENT (minimum limit from 5
to 250A)
ATTENTION: If the set minimum limit (of remote control MINI-
MUM CURRENT) is greater or equal to the MAIN WELDING
CURRENT I1, welding will take place at the MAIN WELDING
CURRENT I1, regardless of the setting chosen on the remote
control.
• SLOPE DOWN time (maximum settable limit from 8.00 to
15.0 sec)
• POST GAS time (maximum settable limit from 10.00 to 25.0
sec)
4) Keep pressing the SET key for more than 1
second to leave the weld parameter setting
phase
5) The set values are now active and it is possible to weld.
ACTIVATION OF SPECIAL PARAMETERS
Activation of special parameters, only valid for the TIG 'weld-
ing process' with HF ignition, must be performed as follows:
1) With the welding machine switched off, press
and hold down the PROG button
2) Start up the welder by turning the main switch to position I
3) Turn the 'Digital adjustment/control of all
welding parameters' knob (pos. 4 fig. B) until
SPE appears on the display.
4) Press PROG to confirm.
The active welding parameters are:
• IGNITION CURRENT (5 ÷ 250 A)
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