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 Post subject: Open Frame Relay substitute
PostPosted: Sep Mon 23, 2019 5:53 pm 
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Joined: Jul Tue 29, 2014 12:25 am
Posts: 229
Location: Las Vegas, Nevada
In this picture, the lower relay on the right is what I want to replace because of age.

There are no markings on the the relay and in my searches I can not find an exact match whether nos or used. How difficult would it be to use a close substitute?

There is 120V coming in and and the other two terminals are about 8-9 volts.

Firstly does anyone recognize this relay? I'm assuming it's a general purpose but Manufacturer unknown.

Attachment:
Relay 800-450.jpg
Relay 800-450.jpg [ 322.3 KiB | Viewed 1310 times ]


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Mon 23, 2019 8:19 pm 
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Joined: May Tue 30, 2006 4:46 pm
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Location: Santa Rosa, CA
What is the equipment?

Looks like an antenna transfer relay?

Rich


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Mon 23, 2019 8:24 pm 
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It's a homebrew RF Amplifier.


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 5:53 pm 
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Location: Roanoke, VA
Why do you want to replace it? Is there a problem with it? If the contacts seem flakey have you burnished them?

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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 6:39 pm 
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Thanks for asking why to replace ..... I think I shorted it when I was trying to add a capacitor for an SSB delay. When I added the capacitor to a lower terminal, the relay closed and will only open when the AC power is removed... unplugging.


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 7:33 pm 
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Joined: Sep Tue 30, 2014 6:08 am
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Location: Norfolk, VA
Coil voltage? Contact arrangement? (DPST, DPDT, etc)

You can still find open frame relays, as they are used quite often in industrial equipment. I run into them from time to time.

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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 7:36 pm 
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radiocom wrote:
..... the relay closed and will only open when the AC power is removed... unplugging.

Is this a standard relay, that is, one that consists of a simple coil electromagnet that is supposed to actuate with power applied and release with power removed? If so, it sounds like there is a wiring problem.

That being said, it could be that the relay is now wired such that one of its switches conducts power through the coil upon actuation of the coil. If that is the way it is now, either something has changed with the wiring, or there's another place in the circuit that is designed to remove power from the coil.

OR maybe one of the relay switch arms is stuck to where it doesn't respond to what the coil wants it to do.

OR the latching is caused by another circuit somewhere else in the device.

The solution is two fold. Disconnect both coil leads from the rest of the device and check for proper coil action and continuity for all the contacts. Then you'll know if the relay is working and if it is, then the problem is something else. Second, trace the wiring to find out what's latching the relay. If it's clear that it's designed to latch, then trace further to find a circuit in the device that is designed to unlatch it.


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 8:31 pm 
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Findm Keepm ...... I dont know the coil voltage but there is 120vac on the back side and the two posts up front on the side according to the picture, on the bottom have 9vac

Keep in mind I do not know much about these.

Thanks Many


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 9:10 pm 
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Joined: Apr Thu 12, 2007 3:24 am
Posts: 2268
Location: Milwaukee WI 53219
If that relay has a diode and transistor circuit driver its possible one of those parts shorted when you connected the SSB cap.


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 Post subject: Re: Open Frame Relay substitute
PostPosted: Sep Tue 24, 2019 10:52 pm 
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Location: Las Vegas, Nevada
Forumuser .... it does have a transistor but I do not see a diode. Now, when I unbolted the transistor, a leg fell out of the body of the trans. Maybe that's my problem?

Thanks


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