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LIST OF CONTENTS Page
READ THIS FIRST 4................................................................
COMPONENT DESCRIPTION 5......................................................
CONNECTION DIAGRAM LTO 160 8.................................................
CONNECTION DIAGRAM LTO 250 10.................................................
BLOCK DIAGRAM, CIRCUIT BOARD AP01 12.........................................
DESCRIPTION OF OPERATION, CIRCUIT BOARD AP01 14.............................
AP01:1 Power supply 14..........................................................
AP01:2 + 5 V Power supply monitoring 15...........................................
AP01:3 Start / Stop input 16.......................................................
AP01:4 Gas valve 16.............................................................
AP01:5 Shunt input with amplifier AP10 16..........................................
LTO 160 17..............................................................
LTO 250 17..............................................................
AP01:6 Arc voltage monitoring 18..................................................
AP01:7 HF Generator 18..........................................................
AP01:9 Machine type indicator 19..................................................
AP01:10 Thermal overload cutout 19.................................................
AP01:11 Welding process control 19.................................................
AP01:12 Motor control interface circuits 20...........................................
AP01:13 Pulse width modulator 21...................................................
AP01:14 Gate circuit LTO 160 22....................................................
Checking the gate pulses, LTO 160 23......................................
AP01:14 Gate circuit LTO 250 24...................................................
Checking the gate pulses, LTO 250 25......................................
Component positions, circuit board AP01 27...........................................
LTO 160: TRANSISTOR BOARD AP02 28.............................................
LTO 160: TRANSISTOR BOARD AP03 30.............................................
LTO 250: TRANSISTOR BOARD AP02 32.............................................
LTO 250: TRANSISTOR BOARD AP03 34.............................................
MOSTEST ER 36.....................................................................
LTO 160: SOFT STARTING 37........................................................
LTO 250: SOFT STARTING 38........................................................
SUPPRESSION BOARD AP07 39.....................................................
LTO 160: SUPPRESSION BOARD AP08 40...........................................
LTO 250: SUPPRESSION BOARD AP08 40...........................................
MOTHER BOARD AP12 42...........................................................
ROTATION AP13 46.................................................................
WIRE FEED AP14 48................................................................
POWER SUPPLY AP15 50...........................................................
CONNECTOR BOARD AP16 52.......................................................
CONNECTOR BOARD AP17 53.......................................................
PULSE GENERATOR INTERFACE BOARD AP18 54....................................
CONTROL BOX E01 56..............................................................
Display board 57...................................................................
Microprocessor board 58............................................................
Battery replacement 61.............................................................
FAULT/ERROR MESSAGES ON THE DISPLAY 62......................................
Faults in the power electronic circuits of the machine 62.................................
Memory errors/faults 62.............................................................
Communication faults/errors 63......................................................
Errors in the course of welding 63....................................................
Errors in the course of sequential running 64...........................................
Blocking messages 64..............................................................