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Post by Cole S. on Mar 28, 2009 21:22:52 GMT -5
No, it's not the capacitors. Many fans just do this with use, it's very common.
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Post by az2000 on Mar 29, 2009 20:34:05 GMT -5
No, it's not the capacitors. Many fans just do this with use, it's very common. Just curious: what is the role of the two capacitors? One reason I wondered if a problem exists with the capacitors is that, when I turn off this fan, it sends a spike through the house wiring. I hear it in the computer speakers. And, a motion-sensing porch light turns on. (But, only when I turn it off with the 3-speed pull chain. It doesn't do it when I turn off the wall switch controlling the fan and light.). The other SMC Emperor (with no hum) doesn't do this. Mark
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Post by Cole S. on Mar 29, 2009 21:43:42 GMT -5
The capacitors are wired in a series to create the speeds of the fans.
That sounds like a wierd problem, I don't know what could cause that.
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Post by John Shelley on Mar 30, 2009 12:25:31 GMT -5
normal for any motor to hum more at some position due to minor harmless variations in the magnetic fields for the rotor and stator it is more noticeable on solid state controls and at slower speeds. Could a hum that occurs when the motor is at one position be a problem with the capacitors? I have two SMC Emperors (circa mid '80s). One makes the pulsating hum, occurring when one fan blade passes by. The other fan doesn't. The fan that hums has had 100 times more use than the other fan. (It also had the noise problem which I recently fixed with oiling, tightening bolts, adding rubber insulation at various points of contact.). I'm wondering if more use over its lifetime has something to do with it. If so, would the capacitors be worn out? Mark Over time heat can break down the varnish on the windings allowing them to viberate more. It does not affect the operation of the motor and does not need to be fixed. No, it's not the capacitors. Many fans just do this with use, it's very common. Just curious: what is the role of the two capacitors? One reason I wondered if a problem exists with the capacitors is that, when I turn off this fan, it sends a spike through the house wiring. I hear it in the computer speakers. And, a motion-sensing porch light turns on. (But, only when I turn it off with the 3-speed pull chain. It doesn't do it when I turn off the wall switch controlling the fan and light.). The other SMC Emperor (with no hum) doesn't do this. Mark the pull chain switch could be worn out causing it to spark escessivily when it is turned off.
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Deleted
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Post by Deleted on Apr 1, 2009 16:05:08 GMT -5
True. It COULD be one of the capacitors but then one or more of the speeds would not work properly.
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