Ap07 Ac Control Circuit Board; Ap07:1 Power Supply - ESAB DTE 255 Service Manual

AP07 AC control circuit board

All functions on this circuit board are galvanically isolated from the rest of the machine,
except GND3, which is connected to negative. See the the diagram on page 45.
From serial no. 246- -xxx- -xxxx a new version of the board is fitted to the machines. This
description applies to all versions of the board. All versions can be used in all machines.
AP07:1 Power supply
Power supply for AP07
A switched power supply, operating at 40kHz, is used in order to provide
galvanic separation of the IGBT drive voltages.
To check the adjustment of the power supply measure between pins 1 and 3 at
the test connector XD. The voltage must be 28V ±1V. If it is out of tolerance
adjust with potentiometer R1.
The voltages +17V/1- -4, - - 11V/1- - 4 and GND1- -4 are connected to the IGBT
drives, see page 45.
+5V and +15V is used for internal power supply on the board. The tolerances
are ±4%.
cdte1de1
- - 44 - -