Guineafowl's latest activity
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GGuineafowl replied to the thread Running older induction motors on VFDs.It was the multimeter measuring. The supply neutral is referenced to earth at the pole transformer, probably around 100m of cable length...
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GGuineafowl replied to the thread Running older induction motors on VFDs.Thanks, the line trigger trick worked better, but the trace is either incomplete or slowly redrawn, presumably due to variations in line...
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GGuineafowl replied to the thread Running older induction motors on VFDs.But the VFD isn’t a step-up type - the output is three-wire, effectively delta, 3ph at 240 Vrms phase and line voltage. It should, as I...
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GGuineafowl replied to the thread Running older induction motors on VFDs.No neutral. The VFD output is 240 V P-P. How come it displayed the real 240 V mains ok?
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GGuineafowl replied to the thread Running older induction motors on VFDs.Try as I might, I couldn’t get the scope to trigger properly. This is channels 1 and 2 on U and V terminals of the motor, scope set to...
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GGuineafowl replied to the thread Running older induction motors on VFDs.Thanks! I did have CT surgery about ten years ago. This is more a side-issue of deep thenar pain, maybe tenosynovitis or basal joint...
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GGuineafowl replied to the thread Running older induction motors on VFDs.I found some 1 mm##^2## magnet wire. My LCR meter (actually an ESR meter with L as a side function) is quite limited, so I ended up with...
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GGuineafowl replied to the thread Running older induction motors on VFDs.Thanks - I’ll get on with building the inductors when I get a chance. I have adjusted the probes using the CAL terminal, and they were...
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GGuineafowl replied to the thread Running older induction motors on VFDs.The ferrite toroids have arrived. Should they be wound with magnet wire, and what size, or could I use the existing rubber single flex...




