Help needed with solid state relay
I'm having a problem with a solid state relay. I'm in a paper converting plant with lots of dust. The original hardware was a mechanical relay with a 120VAC coil and switching 24VDC on one set of contacts. Because of the dust the contacts on the relay tend to corrode and burn up. I thought that a solid state relay might solve the problem. I replaced two of the relays with AD-SSR810-AC-28Z solid state relays (a comprehensive explanation of relays Basic Knowledge of Relay Electronics Tutorial with Video). for the first week everything was good. After a power outage, the PLC output, 120VAC, would energize the SSR coil but the contacts wouldn't switch. In an effort to troubleshoot, I used a jumper across the SSR contacts to insure the downstream equipment worked. After this the relays began switch every time with no issues. Until there is a power outage or a long duration downtime event. Then I break out the jumper and all is well until the next downtime event. How can I make this work? My original goal was to eliminate replacing mechanical relays every 5-7 days. Maybe a capacitor across the SSR output?
Thanks in advance!
Thanks in advance!
0
Comments
As for your issue, read the datasheets first
Also should you have trouble finding an AC-controlled DC SSR you can get a DC-controlled SSR and drive it via an enclosed mechanical relay from any low-voltage source (they don't need much current nor create any spikes so any small relay will go).
Good luck!