Return to Section TOC
Return to Master TOC
THEORY OF OPERATION
FIGURE E-4 – ANALOG CONTROL POWER SUPPLY BOARD AND WELD CONTROL BOARD
to Master TOC
+
DC
POWER SOURCE
(EXTERNAL)
_
INPUT |
|
| LEFT AND RIGHT |
| |
DIODES | INPUT | CHOPPER MODULES |
| ||
|
|
|
| ||
| CONTACTOR |
|
|
| |
|
| CR1 |
|
|
|
|
|
| IGBT |
| FREEWHEELING DIODE |
|
|
| CHOPPER MODULE |
| |
|
| INPUT |
|
| CHOKE |
|
|
|
|
| |
| CAPACITORS |
|
|
| |
| ON/OFF |
| IGBT |
| FREEWHEELING DIODE |
| MODE |
|
|
|
|
| SWITCH | 20 | CHOPPER MODULE |
| |
| (1/2) |
| |||
| VDC |
| ON/OFF | VOLTS AMPS | |
|
|
| |||
|
| x 2 |
| MODE |
|
|
|
|
| SWITCH |
|
|
|
|
| (1/2) |
|
|
|
|
| GATE |
|
|
|
| ANALOG | SIGNALS |
|
| DC | 40 |
| WELD | |
| BUS | VDC | CONTROL VOLTAGES | CONTROL | |
|
|
|
| REGULATED |
|
| POWER |
| POWER | FAN | BOARD |
| SUPPLY |
| SUPPLY |
| |
|
|
|
| ||
| BOARD |
| BOARD |
|
|
TO ELECTRODE
CABLE
SHUNT+
CURRENT FEEDBACK
TO WELD CONTROL BOARD
REMOTE
RECEPTACLE
CCSLOPE
(STICK/GOUGE or PIPE)
Return
Return
40 VDC | ARC OUTPUT | HOT |
| |
15 VDC | THERMAL | |||
FORCE | CONTROL | START | LIGHT | |
| CONTROL | |||
|
|
|
| |
| CR1 |
|
|
|
| COIL |
|
|
|
PERIPHERAL |
|
|
|
|
BOARD | INDICATOR |
|
| |
| INPUT |
|
|
|
| LIGHT |
|
|
|
-
WORK
Return to Section TOC
Return to Master TOC
ANALOG CONTROL POWER SUPPLY BOARD AND WELD CONTROL BOARD
The Analog Control Power Supply Board, which is pow- ered by 40 VDC delivered from the DC Buss Power Supply Board, supplies various regulated DC voltages to operate the Weld Control Board circuitry. It also pro- vides two regulated 20 VDC supplies to operate the electronics on the Chopper Module Boards and applies a 15 VDC supply to the Peripheral Board.
The Weld Control Board monitors the operator controls (arc control, output control, hot start control, mode selector switch, CC Slope switch and the remote con- trol receptacle). It compares these commands to the
current and voltage feedback information it receives from the shunt and output terminal circuits. The cir- cuitry on the Weld Control Board determines how the output should be controlled to optimize welding results, and it sends the correct PWM gate signals to the IGBT driver circuits. The Weld Control Board commands the voltmeter and ammeter, which display both preset and actual (while welding) voltage and current. The Weld Control Board also controls the cooling fan motor and the thermal indicator (light).
Return to Section TOC
Return to Master TOC
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.