From: "Bruce Kingsley"
Subject: Re: Relay controlling electric doorstrike - kickback protection needed?
Date: Fri, 4 Oct 2002 20:19:18 -0700
Organization: MindSpring Enterprises
X-Server-Date: 5 Oct 2002 03:25:13 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2919.6600
If your not sure, you can have your controller drive a larger external relay
that you know is designed to handle the larger AC inductive load.
"ohaya" wrote in message news:3D9CD4D3.2A11DA3F@cox.net...
> I'm looking into control an electric doorstrike using a device made by a
> company called B&B Electronics called the 232DRIO:
> According to the website (and the PDF manual there), this device has two
> relay outputs, so I am thinking of using the relay to close the loop
> between a 16VAC transformer and the doorstrike. Here's the page on the
> doorstrike and transformer:
> I spoke to (supposedly) and engineer at B&B today, and was asking if the
> 232DRIO is used with something like a doorstrike (i.e., an
> electro-mechanical device), whether I needed to add anything to protect
> the relay against kickback, or whether the 232DRIO has protection
> already built in. She couldn't tell me, so I asked if she could tell me
> specifically which relay(s) were used in the device so I could look up
> the specs myself.
> Unfortunately, I don't think the person I spoke to knew much, as she
> kept telling me that there was no relay on the board, and that the relay
> was "on the chip" (presumably the microcontroller) [Note that the
> 232DRIO is spec'ed to handle 120VAC].
> I was wondering if anyone has had any experience with the 232DRIO? If
> so, can you provide info about which relay is used?
> If not, I was wondering, in general, if I should add any additional
> circuitry between the relay and the doorstrike to protect the relay?
> Thanks in advance!