G-20
ELECTRICAL DIAGRAMS
INVERTEC STT & STT II
G-20
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to
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c
ti
o
n
T
O
C
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to
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c
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T
O
C
R
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to
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c
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T
O
C
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rn
to
S
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c
ti
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n
T
O
C
R
e
tu
rn
to
M
a
s
te
r
T
O
C
R
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tu
rn
to
M
a
s
te
r
T
O
C
R
e
tu
rn
to
M
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s
te
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T
O
C
R
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tu
rn
to
M
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C
Schematic - Driver Board - All Codes - (S20799)
NOTE:
Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty.
Individual Printed Circuit Board Components are not available from Lincoln Electric.
This information is provided
for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.
Capacitor Pre-charging Circuits
J16
7
J11
3
J16
8
100
R12
DRIVE
GATE
GATE
GATE
GATE
T1
6
3
7
10
4
9
8
5
1
12
J9
1
J9
4
J9
3
J11
1
J10
4
150K
R
6
100
R7
4A
900V
Q1
20W
250
R
1
1W
12V
DZ1
150K
R3
150K
R4
20W
250
R2
150K
R
5
J9
6
J10
6
J16
3
J10
1
J10
3
20W
250
R14
J16
1
1W
12V
DZ2
150K
R
10
150K
R
11
4A
900V
Q2
150K
R9
20W
250
R
13
150K
R8
J16
2
J16
13
J16
12
20799
Power Switch Drive Transformer
11-4-92
LC
Ch'ge.Sht.No.
J11
S4
PROTECTION
N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE
WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY
DATE
SUBJECT
EQUIP.
TYPE
S2
NOTES :
NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE
NUMBER.
G1
FROM
SUP'S'D'G.
ON 3 PLACE DECIMALS IS + .OO2
S3
WITH PUBLISHED STANDARDS
UNLESS OTHERWISE SPECIFIED TOLERANCE
CLEVELAND, OHIO U.S.A.
TO POWER
BOARD
TO
ON HOLES SIZES PER E-2056
SWITCH
6
4
1
3
J16
MATERIAL TOLERANCE ("t") TO AGREE
S
G2
DR.
SCALE
THE LINCOLN ELECTRIC CO.
G4
BOARD
S1
G3
NONE
CHK.
PROTECTION
SHT.
NO.
S
J9,J10
4
1
2
3
ON ALL ANGLES IS + .5 OF A DEGREE
ON 2 PLACE DECIMALS IS + .O2
BD.
20
79
9
FROM
BD.
J16
14
7
14
1
8
FILE: S20799-1AA
INVERTER WELDERS
SCHEMATIC, DRIVER BOARD
BS
6-25-93C
