Edition 050614
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20AP1 Control board
The processor on the control board monitors and controls the various functions of the power
unit. It obtains information on welding data and welding processes from the welding data
board in the MMC control panel.
From serial no. 347--xxx--xxxx a new version of the control board is fitted to the machines.
The control boards are interchangeable up to and including serial no. 105--xxx--xxxx, from
serial number 347--xxx--xxxx the new version of the control board must b e used.
WARNING: This circuit board looks identical to the control board used in the 500 Amp
Aristo machines, but there is a difference in both hardware and software. If wrong board is
used, it might cause serious damage to the machine. Make sure that the replacement board
has correct article number, see the spare parts list.
The control board has a software identity, machine ID. When starting up the machine the
MMC unit sends a request for the ID, this board has ID 11, which means that it is a 400
Amp machine.
20AP1:1 Power supply
Power supply, circuit board version 1
+24 V Power supply to relay board 20AP2
+15 V Internal power supply on 20AP1 and power supply to the pulse
transformers on 15AP2.
-- 1 5 V Internal power supply on 20AP1.
+5 V Internal power supply on 20AP1.
Power supply, circuit board version 2
This circuit board has a more powerful +5 V and +15 V supply, which is
needed for the processor used on this board.
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