Diagnostic workflow
Panasonic RF2 Wire Feed, Gas Flow and Arc Stability Fault Routing
Workflow for RF2 feeder, gas-valve, slow-feed, hot-voltage, burn-back and unstable-arc symptoms before replacing inverter power-stage parts.
Database summary
RF2 wire-feed and gas faults should be routed from the torch command through the feeder interface before replacing the inverter section. A symptom such as no gas, no motor, motor full speed, unstable arc start or incorrect burn-back timing can originate in the feeder harness, CPU control output, I/F board, motor drive path, gas valve path or welding-output feedback.
Feeder / gas / arc symptom table
| Symptom | What to check first | Likely routing |
|---|---|---|
| Gas abnormal or no gas | Torch switch input, gas valve command and feeder connector continuity. | Control-interface or valve path before main inverter. |
| Motor does not run | TP6(VG), motor drive command, feeder harness and jog / slow-feed behavior. | Motor drive, CPU command or feeder wiring. |
| Motor runs but speed cannot be adjusted | TP6(VG) current command and speed-control circuit response. | CPU PCB control path or command scaling fault. |
| Burn-back timing wrong | VR3(BBDL) burn-back delay and VR4(FTT) FTT voltage setting. | Stop sequence or CPU-board timing adjustment. |
| Arc start unstable | Slow wire feed, hot voltage setting, output terminal connection, contact tip and liner condition. | Feeder mechanics, hot-start voltage, CT feedback or cable evidence. |
| Arc unstable during welding | Wire feed stability, drive roll slippage, workpiece surface, stick-out and welding speed. | Process-side evidence first; board diagnosis only after feed and cable issues are cleared. |
Adjustment references
| Adjustment | Function | Field interpretation |
|---|---|---|
| VR1 (SLDN) | Slow wire-feed speed; clockwise increases speed in the reference procedure. | Use when slow-feed or arc-start behavior is wrong. |
| VR2 (HOTV) | Hot voltage; clockwise increases hot voltage. | Use when arc start is weak after feeder mechanics and output connections are confirmed. |
| VR3 (BBDL) | Burn-back delay; clockwise lengthens delay. | Use when wire sticks in the pool or burns back into the contact tip at stop. |
| VR4 (FTT) | FTT voltage timing reference, about 0.2s to 5s adjustment range in the service data. | Use as stop-sequence timing evidence, not as a random adjustment. |