18Ap1 Ac Control Board; 18Ap1:1 Power Supply - ESAB Caddy Tig 2200i AC/DC Service Manual

18AP1 AC control board

Sections 18AP1:1 to 18AP1:6 refer to the wiring diagram on page 8.
The processor on the AC control board monitors the temperature in the AC power modules.
The AC control commands are generated by the processor on circuit board 20AP1 and
executed by the local processor.
Circuit board identity
The AC control board has a machine ID, a hardware ID and a unit type number. To read this
you need the ESAT service kit, see page 43.
The machine ID determines which type of power source the board is intended for.
S
The hardware ID shows design and type of circuit board.
S
The unit type is used for identification on the can bus.
S
The ID numbers of this board are:
Machine ID = 1
Hardware ID = 1
Unit type = 5
18AP1:1 Power supply
The AC control board comprises a switched voltage regulator. This is used in
order to provide galvanic separation of the IGBT drive voltages, 4 x 17 V and
4 x --11 V. The voltages can be tested by checking the gate signals to the AC
power board, see page 50. If the --11 volt is outside the limits 10.45 to 11.55 V,
fault code 9 is displayed.
The +5 V and +15 V are used for internal power supply on the board.
If the +5 V is outside the limits 4.75 to 5.25 V, fault code 4 is displayed.
If the +15 V is outside the limits 14.25 to 15.75 V, fault code 8 is displayed.
Measuring points are shown on page 24.
ct33_18
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S0740 800 179/E071123/P64