INVERTEC V300-I
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
E-1
THEORY OF OPERATION
iary transformer for the appropriate input
voltage.
The auxiliary transformer develops the
appropriate AC voltages to operate the
Cooling Fan, the PC boards, and a wire
feeder (if connected). See Figure E.1.
INPUT LINE VOLTAGE
The single-phase or three-phase input
power of 200, 220, 380, 415, or 440 volts
AC is connected through a line switch on
the rear panel.
A reconnect panel allows the user to switch
to low or high voltage and connect the auxil-
POWER SUPPLY OPERATION
FIGURE E.1 — INPUT POWER CIRCUITS.
1ø OR 3ø DETETCTION (H5)
LINE
SWITCH
INPUT
RECTIFIER
AC1
AC2
AC3
A-LEAD
AUXILIARY
TRANSFORMER
TO
WIREFEEDER
18VAC
24VAC
POWERBOARD
24VDC
PULSE
TRAIN
DRIVER
BOARD
PRE-CHARGE
PRE-CHARGE
2ND STEP PWM
1ST STEP PWM VOLTAGE
15VDC-CONTROL BOARD FUNCTION VOLTAGE
24VAC-THERMOSTATS-GUN TRIGGERING
LOCAL
REMOTE
METER MODE
POT
POT
PROTECTION
BOARD
<1 VDC
RIGHT SWITCH BOARD
FET MODULES
CAP
FET MODULES
FAN
1
2
3
CONTROL
BOARD
Y-Y FEEDBACK
CR1
CR2
3A
POWER SWITCH
SECTIONS
20KHZ
LEFT SWITCH BOARD
FET MODULES
CAP
FET MODULES
CURRENT
TRANSFORMER
MAIN
TRANSFORMER
CHOKE
RECTIFIER
HEATSINK
BOTTOM
1 DIODE
5 DIODES
5 DIODES
TOP
TOP
1 DIODE
CHOKE
CHOKE
SHUNT
CURRENT FEEDBACK-PROTECTION
VOLTAGE FEEDBACK
NOTE: Unshaded areas of block logic diagram are the subject of discussion.
