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DESCRIPTION OF OPERATION
Transistor Q2 is a pre-regulator that drops the voltage from 60 V to 20 V. Q2 is current-limited
to about 200 mA.
VR1 and VR2 are voltage regulators, producing 5 V and 15 V respectively. The circuit
board's microprocessor monitors the voltages. If the 15 V supply falls below 13 V, the wire
feed unit is stopped.
13AP1:2 Activation, power source
The start signal is connected to the power source via pin F in connector 13XP1.
13AP1:3 Crater filling
This function is only used by units with control panel M13.
The crater fill function can be used when the feed unit is working with a ESABMig or LAW
power source.
The crater fill function comprises the following modules:
•
An input for selecting crater fill function On/Off.
Closing switch 13RP4 activates the function.
•
Potentiometer 13RP4 sets the crater fill time.
Times between 0–5.1 s can be set.
•
An output, terminal F06, which supplies a signal to the power source when the voltage
is to be reduced for crater filling.
The emitter of the transistor in the optocoupler is connected to 0 VB, i.e. to the neutral
of the power source voltage reference.
0740 800 144
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© ESAB AB 2018
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