Voltage relay - Printable Version
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+--- Thread: Voltage relay (/showthread.php?tid=3420)
Voltage relay - HoosierDaddy - 04-02-2017
the central vacuum cleaner on my Newell sends 120V to the micro switch where the hose plugs in. Is there a way to make that a low voltage circuit? I'm thinking of using a relay. I'm wondering if there is a relay available that's also reduces the voltage in the signal wire?
RE: Voltage relay - encantotom - 04-02-2017
not doubting your technical prowess, but in wall vacuums usually only have a low voltage wire to the wall plate where the hose plugs in. the relay is in the vacuum unit itself. that is why it uses usually a 22 or 24 gauge wire to the wall plate. i have installed several of them and i know at least the newer rv built in vacuums are the same.
are you sure it is 120v there at the wall plate?
tom
RE: Voltage relay - RussWhite - 04-02-2017
I am just piling on here, but no one would design a circuit with exposed 120VAC for the hose sensing circuit. Way too much liability of some adult or child getting hurt. Please check again and get back with us.
Russ EE
RE: Voltage relay - HoosierDaddy - 04-02-2017
Yes it is 120V . I checked it with my arm then my volt meter..I then traced the wire back to the box on the side of the motor on the vac. The wire appears to be 16 gauge at best. I'm very surprised if Newell did it this way but it appears to be original.
RE: Voltage relay - RussWhite - 04-02-2017
I agree. If Newell did that it is very disappointing.
Russ
RE: Voltage relay - Richard - 04-03-2017
Yes, it can be done. This is one example of the relay you could use. https://www.mcmaster.com/#contactors/=1719sw5 or https://www.grainger.com/product/5LE35?gclid=Cj0KEQjw5YfHBRDzjNnioYq3_swBEiQArj4pdLlwGfm5N1UzsWD3Y88xDCmWRXVmq3ULOj3seM3Ox3caAjwC8P8HAQ&cm_mmc=PPC:GOOGLEPLAA-_-Electrical-_-Relays-_-5LE35&AL!2966!3!166591437759!!!g!81032003997!&s_kwcid=AL!2966!3!166591437759!!!g!81032003997!&ef_id=V4qY0wAAATrKRy0A:20170403112032:s
You are looking for 12V DC control voltage, that way you can use the 12V power in the coach for the low voltage circuit. I would fuse it at the source when doing it this way.
RE: Voltage relay - HoosierDaddy - 04-07-2017
Thanks to all for your response. Typically I approach these problems the hard way...Such as trying to source parts to build my own control box!!! As I ruminated on this I got the bright idea to call my local central vacuum dealer. He said that early systems did run the 120V to the wall inlets. As solid state voltage reducers became common they incorporated that technology. It seems that many units have the board built in. He had a board that could be modified to stand alone in a separate box. So this one board steps voltage down to 24V and relays the 120V!. I mounted it right next to the vac unit in the bay. It works great!!!
RE: Voltage relay - 77newell - 04-08-2017
AWESOME! That is a great approach. It's shocking how things develop at times
Given your talent I'm no longer shocked. Sorry, I just couldn't resist.