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AP04 Processor circuit board
There are two versions of the board, the in-- and output signals are the same, both versions fits
in any machine having version 1 or 2 of the front panel circuit board, AP05. Machines having
version 3 of circuit board AP05 must have version 2 of AP04.
Version 2 of AP04 has part no. 0486 770 880, it is fitted to the machines from May 2002.
Version 1 of AP04 has part no. 0486 665 880, this boar d is not more available.
The denominations of the in-- and output connections are different on version 1 and 2 of the
board:
Version 1 / Version 2 = X1 / XA, X3 / XC, X4 / XD, X9 / XB
Processor board AP04 performs the following duties:
S Control of all logical functions, e.g. mode of operation.
S Control of time functions:, e.g. slope time
S Creating the current set value.
S Setting the hotstart current level for MMA to two times the set current.
S Creating the frequency and balance for the AC operation.
S Controlling the AC unit, AP07.
S Controlling the HF generator and the gas valve.
S Matching the control signal according to the actual welding mode.
S Realisation of the Arc Force for MMA welding.
An arrangement of analogue circuits that characterise the control function of certain welding
modes, such as TIG and MMA welding, is included on the board. All functions are monitored
and controlled by a microprocessor on the board.
The power supply t o AP04 comes from AP01: see AP01:1 on page 16--17.
Functions on AP04 which are connected to other circuit boards are described in conjunction
with those boards.
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