Guineafowl's latest activity
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GGuineafowl replied to the thread Running older induction motors on VFDs.Yes, it’s been two house moves since I last saw the Hameg manual. As I remember it, the ADD/CHOP button selects dualling options: ADD...
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GGuineafowl replied to the thread Running older induction motors on VFDs.I’m not sure either of these have the subtract function, but willing to be corrected. My earthing is TN-S, ie N and E linked at the...
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GGuineafowl replied to the thread Running older induction motors on VFDs.One final problem: the VFD output is mains-referenced, so connecting the probe across phases will trip the RCD. Unless the motor earth...
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GGuineafowl replied to the thread Running older induction motors on VFDs.Cheap and cheerful, I’m afraid: https://www.aliexpress.com/item/1005006427487406.html I have a Hameg HM203-5 20 MHz CRO, and a...
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GGuineafowl replied to the thread Running older induction motors on VFDs.Thanks - I see the difference between an RC LPF and the snubber. I’ve ordered a 20-pack of ferrite rings at those dimensions, and have...
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GGuineafowl reacted to Baluncore's post in the thread Running older induction motors on VFDs with
Informative.
Here is a crude first guess at what you need. It has max attenuation at VFD 3 kHz, 0 dB at 50 Hz. The motor model is a guess, now...
