THEORY OF OPERATION | ||
| FIGURE E.4 — MAIN INVERTER BOARD |
|
Return to Master TOC
|
|
|
|
|
|
|
| BLUE |
| ON/OFF SWITCH | 5 | 2 |
| WHITE | |||
|
|
|
| |||||
| 4 | 1 | WHITE |
| ||||
|
|
|
|
| ||||
|
| L | WIRE TIE | BLUE | PWR1 PWR2 PWR4 PW | |||
|
| BLACK | AC1 | |||||
|
| N |
|
|
| WHITE | AC2 | INPUT BOARD |
|
| G |
|
|
|
| ||
115/230Vac |
|
|
|
| PE | W05X0701 | ||
|
|
|
|
|
| (SCHEMATIC: X0701) | ||
50/60 | Hz |
|
|
|
|
|
| RECONNECT |
|
|
|
|
|
|
|
| BOARD |
|
|
|
|
|
| BLUE |
| W05X0408 |
R3 | DC+ |
| DC- |
JP1 | |
RED BLACK
RED |
| DC+ |
|
BLACK |
| DC- |
|
JP1 | Y/G | PE |
|
| JP1 | INVERTER BOARD | |
|
|
| W05X0519 |
|
|
| (SCHEMATIC: X0519) |
Return to Master TOC
|
| FAN | WHITE | RED |
| JP4 | (SCHEMATIC: X0408) |
|
|
|
| ||||
TWISTED CABLE | BLACK |
|
| ||||
|
|
| |||||
|
|
|
| ||||
RIBBON CABLE |
|
|
|
| |||
PCB CONNECTOR CAVITY NUMBERING SEQUENCE |
| ||||||
(VIEWED FROM COMPONENT SIDE OF P.C. BOARD) |
|
| |||||
1 | 4 |
| 2 |
| 16 |
|
|
| 4 PINS |
| 1 | 16 PINS | 15 |
|
|
|
|
|
|
|
|
| |
CONTROL BOARD | |
(SCHEMATIC: X0708) | |
PE | JP2 |
| |
P1 
N1 
RED
BLACK
WHITE
SHUNT | - | |
WHITE | ||
BLACK | ||
| RED |
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Master TOC
MAIN INVERTER BOARD
The Inverter Board includes the following circuits:
- Inverter Circuit: Through the use of Insulated Gate Bipolar Transistors (IGBTʼs) the high voltage (325VDC) input current is switched ON and OFF at a frequency of 80KHz and fed to the primary of the main transformer. The current is regulated via Pulse Width Modulation (PWM). The width of each pulse is determined by a ʻgateʼ signal from the Control Board.
(Seeand
in thisIGBTsection)Operation.Pulse Width Modulation - Main Transformer: The primary function of the main transformer is to reduce the high voltge 80khz output to the proper voltage for welding. It also serves to insulate the operator from the input line. Additional windings of the transformer provide both piamary and secondary feeback signals to the PWM control circuit.
- Output Circuit: The output diodes and the output choke rectify and filter the current from the secondary of the main transformer to make it acceptable for welding. The shunt provides the necessary current feedback information to the Control Board.
Note: The shunt is shown off the board for clarity. It is actually mounted on the Inverter Board.
Return to Section TOC
Return to Master TOC