General Description; Input Line Voltage, Auxiliary Voltage, Precharge - Lincoln Electric INVERTEC V145-S Service Manual

GENERAL DESCRIPTION

The Invertec V145-S is an inverter based welding power
sources that offers soft , crisp Stick and LIF TIG process.
Input Line Voltage, Auxiliary Voltage and Precharge
INPUT LINE VOLTAGE, AUXILIARY
VOLTAGE AND PRECHARGE
The Invertec V145-S can be connected to a 230V single
phase input voltage.
This unit can be also connect to engine driven
generators but it must follow the below conditions:
•
Vac peak voltage: below 410V.
•
Vac frequency: in the range of 50 and 60 Hertz.
•
RMS voltage of the AC waveform: 230Vac ± 15%.
The initial power is applied to the Invertec V145-S trough
a line switch located on the back of the machine. The
voltage is after rectified by the input rectifier on input
board and the resultant DC voltage is applied at inverter
Pcb's.
During the precharge time the DC input voltage is
applied to the filter capacitors ( located on the inverter
Pcb ) through a start resistance ( located on input board)
that limits the charge current. After this time the start
relays go closed and they by-pass the start resistance (
there are two start relays in parallel , RL1A and RL2A ).
The 230AC voltage is also applied to a auxiliary voltage
circuit, that gives the necessary low voltages ( + 15V
and +5V ) for the control board.
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