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THEORY OF OPERATION | ||
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FIGURE E.2 - GENERAL DESCRIPTION, INPUT BOARD & BUS BOARD
Fan |
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24 VDC | Bus board |
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| AC DC Gate drive signals |
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Input |
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| HF |
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board |
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| Voltage Feedback |
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| info.reconnect | .ACcktturnon | supplyhighvolt | feedbackvoltage | feedbackcurrent |
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| Current Feedback |
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| Output |
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| IGBT |
| Diode |
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| Thermostat |
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| Thermostats |
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| (bypass) |
| Main IGBT |
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| & Power board |
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| IGBT's |
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| Output | RF coil | ||
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| Choke | + |
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| infothermostat | metervoltinput | metercurrentinput |
| DC blocking |
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| ckt.AConturn | infoset | PWMonturn | capacitor board |
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| Main |
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| Output | Device |
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| Transformer | board | Transistor |
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| Module |
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| 24 VDC Remote 2/4 path (D + E) |
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| HF control signal |
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| 888 |
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| +48, +24 |
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| Control board | Display & LED |
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Control | (D + E) | |
Remote 2/4 | ||
Knob | ||
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Remote
48 VDC75, 76, 77 A, B, C
Gas
Solenoid
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GENERAL DESCRIPTION
The Invertec® V205T AC/DC is an inverter based industrial welding power source that utilizes single- phase input power to produce constant current AC or DC output for both Stick (SMAW) and TIG (GTAW). With 230VAC input applied the V205T is rated at 200 amps, 18volts at a 40% duty cycle. With 115VAC applied the machine is rated at 150 amps, 16 volts at a 40% duty cycle. The machine has the capabilities to produce several varieties of AC waveforms (square, sinusoidal and triangular). The unit also employs an auto reconnect feature that does not require manual intervention when the input power is changed from 115VAC to 230VAC or 230VAC to 115VAC. When in the TIG mode the operator may select to use either the high frequency or touch start function.
INPUT BOARD AND BUS BOARD
The single phase input voltage is applied to the V205T through a line switch located on the back of the machine. The AC input voltage is filtered and condi- tioned by a network of inductors, capacitors and a varistor that are all located on the Input Board. This fil-
tered input voltage is applied to the Main IGBT Inverter Board. Another function of the Input Board is to pre- vent high frequency inverter generated “noise” from being induced back into the supply lines.
The Bus Board performs several functions within the V205T. It accepts and distributes power and informa- tion to other circuitry. This interfacing is accomplished through harness and ribbon connectors and also via other PC boards that are plugged directly into the Bus Board. The Input Board, the High Frequency Board and the AC
The fan fuse F3, the 400VDC fuse F2 and the water cooler F1 (not used) are also located on the Bus Board.
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NOTE: Unshaded areas of Block Logic Diagram are the subject of discussion
