Table Of Contents - Lincoln Electric POWER WAVE C300 Service Manual
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Also See for POWER WAVE C300:
- Operator's manual (72 pages) ,
- Specifications (2 pages) ,
- Operator's manual (72 pages)
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E-5
FIGURE E.5 - CHOPPER, CURRENT TRANSDUCER AND CONTROL BOARDS
SWITCH
RECTIFIER
IN IN P P UT
UT P P O O W W E E R R
FI FIR R S S T T & & S S E E C C O O N N D D
S S TA TAG G E E
S S I I G G N N AL ALS S
P P O O W W E E R R
O O N N L L E E D D
P P R R E E C C H H A A R R G G E E
R R E E LA LAY Y
C C O O NT
NTR R O O L L
MULTI-PHASE CHOPPER,
CHOPPER CONTROL BOARD,
CURRENT TRANSDUCER AND
The Multi-Phase Chopper is used to control the weld-
ing voltage and current output. It receives the 100 volt
DC from the Planar transformer and produces a regu-
lated output for welding purposes. It contains six chop-
per phases in parallel that turn on 60 degrees out of
phase. Two complimentary phases each conduct 180
degrees out of phase through the same output choke
assembly.
The Chopper Control Board, located on the Switch
Board, receives welding output commands from the
Control Board. The Chopper Control Board then deter-
mines the on-time of the six chopper IGBTs to meet the
requirements set forth from the Control Board.
THEORY OF OPERATION
INPUT
RELAY
F F I I R R S S T T S S T T A A G G E E
BRIDGE
BRIDGE
B B U U C C K K - - B B O O O O S S T T
100 Ohm
CR
4 4 8 8 V V D DC C
FA FAN N
4 4 8 8 V V D DC C
FA FAN N
I I G G BT BT
D D RI RIV V E E S S
SOLENOID
48 VDC
48 VDC
TH
THE E R R M M AL AL L LE E D D
S S P P O O O O L L / /
P P U U S S H H - - P P U U L L L L
B B UZZ
UZZ E E R R
A A R R C-LI
C-LIN N K K C C O O M M M M U U NI NIC C AT ATI I O O N N
C C O O M M M M U U NI NIC C AT ATI I O O N N
NOTE: Unshaded areas of Block Logic
Diagram are the subject of discussion
POWER WAVE® C300
( ( S S E E C C O O N N D D S S T T A A G G E E ) )
H H I I G G H H F FR R E E Q Q U U E E N N C C Y Y I IN N V V E E R R T T E E R R W W IT ITH H
P P L L A A N N E E R R
O O U U T T P P U U T T
T T R R A A N N S S F F O O R R M M E E R R
R R E E C C TIFI
TIFIE E R R
O O U U T T P P U U T T
100V
100V
C C A A P P A A C C I I T T O O R R S S
60KHz
60KHz
IGBT
IGBT
400V
400V
4 4 8 8 V V D DC C
FEEDHEAD
G G U U N N
A A R R C-LI
C-LIN N K K C C O O M M M M U U NI NIC C AT ATI I O O N N
S S TAT
TATU U S S
E E R R R R O O R R
LI LIG G HT
HT
The Control Board receives commands and feedback
information from the User Interface Board, the
FeedHead Board, and the Chopper Control Board. It
also receives output current and voltage information
from the Current Transducer and via leads 202 and
The Current Transducer monitors the output current
and converts that information into a low voltage signal
that is sent to the Control Board.
4.0VDC). The Control Board uses this current feed-
back information along with the output voltage feed-
back to monitor and control the output of the machine.
The control board also houses the software welding
tables.
In addition, the Control Board monitors the thermostat
circuitry, the shutdown circuitry from the P.F.C. Board
and controls the two speed fans.
P P O O S S ITI ITIV V E E
T T E E R R M M I I N N A A L L
(T (TH H I I R R D D S S T T A A G G E E ) )
M M U U LTI-
LTI-P P H H A A S S E E B B U U C C K K
C C O O N N V V E E R R T T E E R R
C C U U R R R R E E N N T T
N N E E G G A A TI TIV V E E
T T R R A A N N S S D D U U C C E E R R
T T E E R R M M I I N N A A L L
120KHz
120KHz
CURRENT
CURRENT
VOLTAGE
VOLTAGE
FEEDBACK
FEEDBACK
FEEDBACK
FEEDBACK
C C H H O O P P P P E E R R
C C O O M M M M U U NI NIC C AT ATI I O O N N
BOARD
BOARD
TH
THE E R R M M O O S S TAT
TATS S
E E TH
THE E R R N N E E T T
S S TAT
TATU U S S
S S TAT
TAT U U S S
LI LIG G HT
HT
" " E E R R R R O O R R " "
LI LIG G HT
HT
(500 Amps =
E-5
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