Ap1 Control Board - ESAB Caddyt Arc 150i Service Manual

20

AP1 Control board

The processor on the control board monitors and controls the various functions of the power
source. It obtains information on welding data from the control panel.
If the circuit board is faulty, it must be replaced. Replacement circuit boards must be
configured, see page 33. After replacing the circuit board, soft--start the machine. See the
instructions on page 46.
From serial no. 613--xxx--xxxx version 2 of the control board is fitted to the machines. The
control boards are interchangeable up to and including serial no. 402--xxx--xxxx, from serial
number 613--xxx--xxxx version 2 of the control board must be used.
Note: There are jumpers on the board that must be moved to the replacement board. See
page 33 for version 1 of the board and page 35 for version 2.
20AP1:1 Power supply
Version 1 of the board has a battery backed RAM memory, version 2 uses a
flash memory.
+5 V supply and battery backup, version 1 of 20AP1
Power supply +5 V, circuit board version 1
IC8 and IC10 monitor the voltage of battery BA1. The nominal battery voltage
is 3 V. If it falls below 2.5 V, the display shows error message E06. Battery life
is about five years. The battery voltage can be tested by service function no.
23, see page 39.
The machine can also operate without the battery, but data stored in the
welding data memory, disappears when the mains voltage is switched off. At
power--up default values will be read into the memory.
A voltage of about 2.5 V is supplied to IC10, pin 9. If this voltage drops below
the threshold voltage of 1.3 V, pin 10 of IC10 goes low, providing the processor
with a low power supply voltage signal. The processor then generates a "
If the +5 V supply to pin 3 of IC10 drops below 4.65 V, pin 15 goes low and
inhibits the pulse width modulator. The processor receives a reset signal and
data in the RAM memory is protected by the backup battery power supply.
Pin 2 of IC10 supplies the RAM memory with power, both when the machine is
energised and when it is shut down.
ct27d_20
" warning signal in the display and stores current data.
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S0740 800 161/E061205/P66