Humming relay question

Brett A. Thomas · 2005-02-14T06:05:00+00:00

All,A while back I'd asked for advice on getting emergency stop switches going in the shop. Based on the advice from this group, I ordered these combo switches and normally closed contactor blocks, model E22JLB2N8B: then ran that over doorbell wire to a 24V transformer I picked up at my local electrical supply store, run off a 110V line from my primary subpanel ("Subpanel A"). I then ran a 30A line to a safety switch, from there to an Eaton 30A contactor, and hooked the doorbell line to the 24V hookup on the contactor. Finally, I hooked the output from the contactor to a new subpanel ("Subpanel B") and turned it all on.Anyway, thankfully, after all that, it worked. :DBut, one question - the contactor hums. LOUDLY. It's only when the 24V is on; I can turn off the safety switch, but not hit an estop switch, and it'll hum. Is it supposed to do that?Brett

Feb 14, 2005 23 Replies

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George 21 years ago

Get a different relay and a properly bridged DC power supply, then. You know what you want. The emergency cut-off, obviously, assumes power is present, else it wouldn't be used to cut it off.

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George 21 years ago

Meant to include this.

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check the reply to the provocateur for DC.

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mac davis 21 years ago

thank you for not sharing that.. *g*

mac

Please remove splinters before emailing

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George 21 years ago

I initially thought it had something to do with the Clinton Whitehouse....

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