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THEORY OF OPERATION
FIGURE E.5 – MODE SELECTOR AND OUTPUT CONTROLS
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DC
POWER SOURCE
(EXTERNAL)
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INPUT |
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| LEFT AND RIGHT |
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DIODES | INPUT | CHOPPER MODULES |
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| CONTACTOR |
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| CR1 |
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| IGBT |
| FREEWHEELING DIODE |
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| CHOPPER MODULE |
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| INPUT |
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| CHOKE |
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| CAPACITORS |
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| ON/OFF |
| IGBT |
| FREEWHEELING DIODE |
| MODE |
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| SWITCH | 20 | CHOPPER MODULE |
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| (1/2) |
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| VDC |
| ON/OFF | VOLTS AMPS | |
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| x 2 |
| MODE |
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| SWITCH |
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| (1/2) |
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| GATE |
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| ANALOG | SIGNALS |
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| DC | 40 |
| WELD | |
| BUS | VDC | CONTROL VOLTAGES | CONTROL | |
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| REGULATED |
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| POWER |
| POWER | FAN | BOARD |
| SUPPLY |
| SUPPLY |
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| BOARD |
| BOARD |
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TO ELECTRODE
CABLE
SHUNT+
CURRENT FEEDBACK
TO WELD CONTROL BOARD
REMOTE
RECEPTACLE
CCSLOPE
(STICK/GOUGE or PIPE)
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40 VDC | ARC OUTPUT | HOT |
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15 VDC | THERMAL | |||
FORCE | CONTROL | START | LIGHT | |
| CONTROL | |||
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| CR1 |
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| COIL |
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PERIPHERAL |
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BOARD | INDICATOR |
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| INPUT |
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| LIGHT |
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WORK
MODE SELECTOR AND OUTPUT
CONTROLS
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In CC mode, machine output is at open circuit voltage. The OUTPUT control presets amps in the 30 to 350 A range and then adjusts actual welding current to match the preset when welding. In CV mode, machine output is at the voltage level set at the OUTPUT control. The OUTPUT control presets volts, then adjusts the actual arc voltage to match the preset when welding.
A HOT START control is provided to enhance arc start- ing with an adjustable output “boost” in either CC or CV mode. The ARC FORCE control (CC mode only) pro- vides extra weld current to prevent electrode “stubbing” An additional CC SLOPE switch improves
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion.