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V300-I
Section E-1 Section E-1
Theory of Operation...............................................................................................Section E
Power Supply Operation ......................................................................................E-2
Pre Charge and Protection Circuitry
....................................................................E-3
Switch Board and Main Transformer ...................................................................E-4
Control and Output Circuitry ................................................................................E-5
Field Effect Transistor (FET) Operation ...............................................................E-6
Pulse Width Modulation .......................................................................................E-7
Protective Circuits ................................................................................................E-8
TABLE OF CONTENTS
- THEORY OF OPERATION SECTION -
FIGURE E.1 – V300-I BLOCK LOGIC DIAGRAM
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
P
RE-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
M
AIN
TRANSFORMER
CHOKE
RECTIFIER
HEATSINK
BOTTOM
1 DIODE
5 DIODES
5 DIODES
TOP
TOP
1 DIODE
CHOKE
CHOKE
SHUNT
CURRENT FEEDBACK-PROTECTION
VOLTAGE FEEDBACK