15Ap1 Power Board; 15Ap1:1 Mains Rectifier Bridge And Charging Circuit - ESAB Aristo Arc 4000i Service Manual

15AP1 Power board

The power board carries the mains rectifier, the smoothing capacitors, the charging circuit
and the switching circuit.
Circuit board connectors marked NC are not connected.
15AP1:1 Mains rectifier bridge and charging circuit
When the mains power supply is turned on, smoothing capacitors C13-C16 are
charged via rectifier bridge BR2. Contactor 2KM1 closes after about twelve
seconds and connects the mains supply to rectifier bridge 15BR1. See
page 44 for a more detailed description of the starting sequence.
Component description:
BR2
C1, C2
C13 - C16
R5, R10
R1
R8, R9
R11 - R13
R14
15BR1
cu19_15
Rectifier for charging current.
Capacitors, restricting the inrush charging current to rectifier
bridge BR2. The current while capacitors C13 - C16 are charging
is about 0.7 A.
Smoothing capacitors, with a total capacitance of 1000 mF.
Discharging resistors for C1 and C2.
Load-limiting resistor (10 W) for the charging current to C13 -
C16.
Potential divider and discharge resistors for C13 - C16.
Varistors. Limit voltage peaks that exceeds about 1000 V.
The varistors do not conduct when the voltage is below 480 V
AC RMS, this corresponds to a peak voltage of 680 V.
Varistor.
Main rectifier for mains voltage.
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S0740 800 191/E100629/P78