I have an IP2CC that has a closure (CC 1:3) that has failed closed. The other two contact closures work fine, but the 3rd one will not open the circuit any longer. I've tried swapping circuits with the other closures and it's definitely a problem with this one contact closure. I'm using it to control 24v DC flowing to a high voltage relay. Perhaps the relay sent a voltage spike out onto the circuit? Does anyone have any experience wiring a CC up in this manner? Should I be including my own IN4003 or similar diode across the circuit to protect the IP2CC against voltage kickback from the relay? I was kind of expecting that the IP2CC would have its own protection circuitry against this kind of thing. Any other ideas why the contact would fail closed?
4 comments
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Ted Malone Here is why I was thinking it didn't need a diode in the mix:
Specifications
Specifications Manufacturer Global Cache Manufacturer Product No IP2CC UPC 810466010204 Power Input 5 to 16V DC @ 300mA USB Power Cable draws power from USB Port Network Connection RJ45 Connector 100/10 Mbits Ethernet Protocol Adheres to TCP, DHCP and HTTP standards LED Indicators Power and all connectors to indicate activity Contact Closure/Relay 3 Integrated contact closure relays with transient voltage suppression Dimensions 3.25" L x 2.25" W x 1.25" H Weight 3.25 oz (6 oz with power supply) -
Josh Sherman It is definitely possible that a spike of voltage or amperage caused the problem you are seeing. How much amperage are you using with your 24V signal? If the relay was supplied more than .5A or beyond 24V then that could easily have caused your relay to weld shut. A diode would definitely provide protection from this, if this is in fact the cause of the problem.
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Daren Noe I just had the same problem. I passed 12V through two of the relays to activate two micro timer relays for a projector screen. It worked fine for a little while, and then both relays stuck on constantly. I would have assumed they would have had an internal diode to protect their relays, but it doesn't sound like it. Frustrating.
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Daren Noe My micro timers https://www.amazon.com/Miniature-cycling-Cycling-Industrial-control/dp/B015Z2EQCU/ref=sr_1_1?dchild=1&keywords=miniature+timer+relay&qid=1595014476&sr=8-1 should have been very low amperage through the IP2CC, but it fried my relays after about 1/2 hour.