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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Neutral-earth short in Bionaire air purifier
A Bionaire air purifier with ionizer works fine in a location without
Earth Leakage Circuit Breaker (ELCB = RCD, RCCB, GFCI, GFI, ALCI), or with an isolation transformer, but trips the ELCB immediately if plugged in with an ELCB. Resistance between neutral and earth varies between 40 to 80 ohms. Is there any most obvious culprit before I open it (e.g., radio interference suppressor capacitor; motor shorted to frame)? By the way, when the purifier got plugged in and tripped the ELCB a "wall wart" 5V 2A switching power supply (for WiFi access point) died at exactly the same time - is this something others have had? I've not seen it before. I doubt it's coincidence. Best wishes, Michael [Email address above no longer valid (used to be)] |
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Neutral-earth short in Bionaire air purifier
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#3
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Neutral-earth short in Bionaire air purifier
I asked about an air purifier with neutral-earth near short-circuit.
Franc Zabkar wrote: If not the cap, then maybe a leaky MOV ? Good point, will check. motor shorted to frame)? I've seen a short between the neutral and earth terminals of a refrigerator compressor. It only came to light because the owner was using an extension cord where the active and neutral were reversed (there was no ELCB). Sounds the same sort of thing I've got. If it's actually a shorted winding it'll mean changinf the motor (or scrapping the unit). Thanks, Michael (original poster) |
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