Lincoln Electric INVERTEC SVM129-B Manuale Utente
Section E-1
Section E-1
INVERTEC STT
Theory of Operation
.............................................................................................................Section E
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
POSITIVE
OUTPUT
TERMINAL
TERMINAL
OUTPUT
NEGATIVE
CONTROL BOARD
IGBT
DRIVER
BOARD
P
O
W
E
R
B
O
A
R
D
FAN
TRANS
T1
TRANS
T4
S
W
W
I
T
C
H
C
H
B
O
A
R
D
O
A
R
D
S
W
W
I
T
C
H
C
H
B
O
A
R
D
O
A
R
D
R
E
C
O
N
N
E
C
T
E
C
O
N
N
E
C
T
P
R
O
T
E
C
T
I
O
N
INPUT
RECTIFIER
LINE
SWITCH
CR1
CR2
B
O
A
A
R
D
D
R
I
V
E
R
B
O
A
A
R
D
PRE -
CHARGE
PRE -
CHARGE
CHOKE
CURRENT
SENSOR
IGBT
MODULE
1 OHM
PEAK
CURRENT
METER
BACK-
METER
PEAK
CURRENT
CONTROL
BACK-
CONTROL
HOT
START
CONTROL
WIRE
SIZE
SWITCH
WIRE
TYPE
SWITCH
VOLTAGE
SENSING
RECEPTACLE
REMOTE
CONTROL
RECEPTACLE
WIRE
RECEPTACLE
FEEDER
R
E
E
M
O
T
E
E
P
R
O
R
O
T
E
E
C
T
T
I
O
N
B
O
A
O
A
R
D
CURRENT
TRANS
T3
MAIN
TRANSFORMER
T2
115
VAC
18
VAC
2
4
V
A
C
"A"
LEAD
15VDC
T
H
E
R
M
O
S
T
A
T
CURRENT FEEDBACK
42VAC
VOLTAGE FEEDBACK
10VAC AND 6VAC
D
R
R
I
V
E
E
S
I
G
N
A
L
L
36VAC
GUN TRIGGER
LESS THAN 1VDC
PWM SIGNAL
PULSE TRANSFORMER SIGNAL
GROUND
GROUND
FET
FET
FET
FET
CAP
CAP
TAILOUT
CONTROL
(STT II ONLY)
FIGURE E.1 – INVERTEC STT