ESAB Caddy Tig 1500i TA34, Service Manual

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INTRODUCTION
0740 800 186 - 5 - © ESAB AB 2016
INTRODUCTION
Design structure of the power source
Block diagram of the Tig 1500i and Tig 2200i
The power source is transistor-controlled, operating on the inverter principle. It consists of a
number of function modules, as shown in the block diagram above. Each module has a
module number, which is always included as the first part of the name/identification of
components in the module.
The modules have the following main functions:
1 MMC module
Control panel and display board.
2 Mains module
Mains switch, mains interference suppressor and power supply board.
10 TIG module
Torch switch interface, HF unit, gas valve.
15 Power module
This module is a single forward converter, operating at a switching frequency of 65 kHz. All
power semiconductors are built into modules.
20 Processor board module (controller module)
This is the controller board, 20AP1, that monitors and controls the power source. The micro
processor of the board comprises the welding data unit.