1-wire Relay

May 13, 2005 2 Replies

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Xavier 21 years ago

I'm having a hard time trying to control a eletromagnetic relay with the 1-wire. I have controlled SSR with no problems whatsoever. With the eletromagnetic relay. I use a ds2405, pnp transistor 1k resistor and a

10k resister and a diode. Everything works until I hook plug in 120v. Then I get an error "Failure to change ds2405 latch state". And sometimes Cannot Communicate with device. These errors wouldnt bother me because the device does turn on. But it causes other relays to turn off breifly when I switch on a relay with 120v going to the relay.. Note that the relays work flawlessly without any errors. Until I hook up the 120v. Even if there is no load. Just plugging in the 120v makes it receive this breif error. Anyone have any ideas??

Xavier

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Dave 21 years ago

Do you have the 120V just connected to the relay contacts and is it isolated from the coil and coil circuit? Maybe a defective relay where there is leakage current from the contacts to the coil. I have had problems with 1-wire if the loop picks stray signals so you may have to to try to shield the loop and curcuit from the 120V wires. Dave

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Ian Shef 21 years ago

"Xavier" wrote in news:1116009068.589021.255730 @f14g2000cwb.googlegroups.com:

A schematic of your circuit would help. Did you provide any decoupling capacitors? How much capacity does your power supply for the relays have? How clean is the layout of your wiring (e.g. did you keep 120 VAC wiring away from 1-wire and relay control signals?)?

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