Return to Section TOC
Return to Master TOC
THEORY OF OPERATION
FIGURE E.2 – INPUT VOLTAGE
Return to Section TOC
Return to Master TOC
S | FET | B | |
W | O | ||
I | CAP | A | |
T | |||
R | |||
C | FET | ||
H | D |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| PRE - | |
|
| LINE |
| INPUT |
|
|
|
|
| CHARGE | ||||||
|
| SWITCH |
| RECTIFIER |
|
| R | P |
| D | B | |||||
|
|
|
|
|
|
|
|
|
|
|
| E |
| |||
|
|
|
|
|
|
|
|
|
| CR1 |
| R | B | R | ||
|
|
|
|
|
|
|
|
|
|
| C | O | O | |||
|
|
|
|
|
|
|
|
|
|
|
| O | T | O | I | A |
|
|
|
|
|
|
|
|
|
|
|
| N | E | A | V | R |
|
|
|
|
|
|
|
|
|
|
|
| C | ||||
|
|
|
|
|
|
|
|
|
|
|
| N | T | R | E | D |
|
|
|
|
|
|
|
|
|
|
|
| E | I | D | R | |
|
|
|
|
|
|
|
|
|
|
|
| O |
| |||
|
|
|
|
|
|
|
|
|
|
|
| C | N |
|
|
|
|
|
|
|
| "A" |
|
|
| T |
|
|
|
| |||
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
|
|
| LEAD |
| CR2 |
|
|
|
| PRE - | ||||
FAN |
|
|
|
|
|
|
|
| 18 | S |
| B |
| CHARGE | ||
|
|
|
|
|
|
|
| P B |
|
|
|
| ||||
|
| TRANS |
| VAC | FET |
|
|
| ||||||||
|
|
|
|
|
|
|
| |||||||||
|
|
|
| T1 |
|
| O O | W |
| O |
|
|
| |||
|
|
|
|
|
|
|
|
|
| W A | I | CAP | A |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ||||
|
|
| 115 |
|
|
|
|
|
|
|
| |||||
|
|
|
|
|
|
| E R | T | R |
|
|
| ||||
|
|
|
|
|
|
|
|
|
|
| ||||||
|
|
| VAC | 2 | C |
|
|
|
| |||||||
|
|
|
|
|
|
|
|
| 4 | R D | FET |
|
|
|
| |
|
|
|
|
|
|
|
|
| V |
| H | D |
|
|
| |
|
| TRANS |
|
| A |
|
|
|
|
|
|
| ||||
|
|
|
| C |
|
| LESS THAN 1VDC |
|
|
| ||||||
|
| T4 |
|
|
|
|
| T |
|
| PULSE TRANSFORMER SIGNAL | |||||
|
|
|
|
|
|
|
|
| H |
|
|
|
| |||
|
|
|
|
|
|
|
|
| E |
|
|
|
|
|
|
|
RPWM SIGNAL
M
O
S15VDC
T
A |
|
|
T | GUN TRIGGER | CONTROL BOARD |
|
|
36VAC
TAILOUT | PEAK | BACK- | PEAK | HOT | BACK- | WIRE | |
CURRENT | GROUND | SIZE | |||||
CONTROL | CURRENT | START | GROUND | ||||
(STT II ONLY) | METER | METER | CONTROL CONTROL CONTROL | SWITCH |
CURRENT
TRANS
T3
WIRE
TYPE
SWITCH
|
| POSITIVE |
|
|
|
| OUTPUT |
|
|
|
| TERMINAL |
|
|
MAIN | 1 OHM |
|
|
|
TRANSFORMER |
|
|
| |
T2 |
|
|
|
|
CURRENT | IGBT | NEGATIVE |
|
|
SENSOR | MODULE | OUTPUT |
|
|
|
| TERMINAL |
|
|
CHOKE |
| R |
| VOLTAGE |
|
|
| ||
|
| E |
| SENSING |
|
|
| RECEPTACLE | |
|
| M |
| |
|
|
|
| |
| D | O |
|
|
| T |
|
| |
| R |
| REMOTE | |
| I | E | B | |
| V |
| CONTROL | |
|
|
| RECEPTACLE | |
| E | P | O | |
| S | R | A |
|
| I | O | R |
|
| G | T |
| |
| N | D |
| |
| E |
| ||
| A |
|
| |
| L | C |
|
|
|
| T |
| WIRE |
|
| I |
| FEEDER |
|
| O |
| RECEPTACLE |
|
| N |
|
|
CURRENT FEEDBACK
IGBT
DRIVER
BOARD
VOLTAGE FEEDBACK
10VAC AND 6VAC
42VAC
Return to Section TOC
Return to Master TOC
GENERAL DESCRIPTION
The Invertec STT is a 225 ampere, inverter based, arc welding power supply specifically designed for the Surface Tension Transfer (STT) welding process. It cannot be classified as either a constant current (CC) or a constant voltage (CV) machine. The STT pro- duces current of a desired waveform to reduce spatter and fumes. The STT process is optimized for short - circuit GMAW welding only.
INPUT VOLTAGE
The Invertec STT can be connected for a variety of
Return to Section TOC
Return to Master TOC
NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.