Hi Everyone,
Got a "Oh by the way" added to my latest project. They want to add 480V 12KW Heater to one of the tanks. Since I have never done a heating application I thought I would run my ideas by everyone and see what you all think.
Panel Design: I plan on using a 3 phase SSR (connected to the PLC output) to control the heater. In front of the SSR's I will install a Contractor. The Neutral from the coil on the contractor will run through the High Temp Relay that is installed on the Heater. So that way if the tank level gets too low and/or the heater gets too hot the contractor will drop out. Of course this shouldn't happen in normal operation because my system will see the level and tank temp and not turn on the heater if the level is too low or the temp is too high, but just in case I want the safety
Control Philosophy: There will be a Temp Transmitter in the Tank. I was thinking of just using a On/Off style of control like a home thermostat. Where I would turn on the heater at a certain Temp and then turn it off at a higher Temp.
One question I have is about the SSR's. Do I have to worry about the heat that they will generate? To take care of this should I just go with a larger SSR's than required? What is the best way to handle the heat?
Let me know what you think of this and if you have any ideas I would be happy to hear them!!
Thanks!!
Got a "Oh by the way" added to my latest project. They want to add 480V 12KW Heater to one of the tanks. Since I have never done a heating application I thought I would run my ideas by everyone and see what you all think.
Panel Design: I plan on using a 3 phase SSR (connected to the PLC output) to control the heater. In front of the SSR's I will install a Contractor. The Neutral from the coil on the contractor will run through the High Temp Relay that is installed on the Heater. So that way if the tank level gets too low and/or the heater gets too hot the contractor will drop out. Of course this shouldn't happen in normal operation because my system will see the level and tank temp and not turn on the heater if the level is too low or the temp is too high, but just in case I want the safety
Control Philosophy: There will be a Temp Transmitter in the Tank. I was thinking of just using a On/Off style of control like a home thermostat. Where I would turn on the heater at a certain Temp and then turn it off at a higher Temp.
One question I have is about the SSR's. Do I have to worry about the heat that they will generate? To take care of this should I just go with a larger SSR's than required? What is the best way to handle the heat?
Let me know what you think of this and if you have any ideas I would be happy to hear them!!
Thanks!!