Guest urbanmiles Posted January 8, 2015 Report Share Posted January 8, 2015 I have the following setup below for my project Container Overheat Indicator .Materials:1pc TC4-M1A temperature controller1pc 12v 3PDT Relay 1pc 12v LED Warning LightAlgorithm:1. The Temperature Controller will read and display the temp. of the environment2. If the temp reading reaches 70 deg C, the temp controller will turn on the 3PDT relay through its own Relay Output3. The 3PDT relay will turn on the 12v LED Warning Light as long as the temp reading is 70 deg C or above4. The 3PDT (and the Light), will be turned off by the Temp Controller if the temp reading is already below 70 deg C.Questions:1. The datasheet does not indicate that the Relay Output of the Temp Controller may be used for DC loads ...It only says:"Relay Output: 3A/250V AC Capacity"However:I still tried connecting the 12v 3PDT Relay to the Temp Controller's Relay Output.And everything works fine, and the algorithm was followed seamlessly . Is it ok to continue doing that ? Is there going to be any problem if I continued doing that?2. Do I need to use a flyback diode for the 3PDT relay?I uploaded below my setup diagram and the Temp Controller's images and sheets .Thanks !TCSerieIntelligent.pdf Quote Link to comment Share on other sites More sharing options...
Guest firefli Posted January 26, 2015 Report Share Posted January 26, 2015 The temp. control data plate shown in the pic. clearly shows AC/DC.I would think that means DC is ok for the unit.I don't know about the flyback. Quote Link to comment Share on other sites More sharing options...
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