mplummer

I am using solid state relays to run my heaters, they pull about 7 amps per zone. I am try to hold them on for about 15 seconds max and about 2 seconds min. I can get them to come on but they are not wanting to shut off at temp. I can't turn down the voltage, all I can do is to turn the contactors on and off. I am try to heat a large metal barrel for a plastic molding machine, that is why I can't just leave the heats on until they are up to temp, the temp will run over. I am now using the PIDE with a SRTP function it seems to be heating but it is hard to control. Thanks for the help.

I've never posted before and I hope someone can help me with my lack of knowledge. I've used RS Logix 5000 before but I never had to use the PIDE function blocks. I am trying to run heats with a contactor, but all the info that I've seen has been for analog outputs. I need to fire an output on/off to control the heats. I am using a 1769-L32E and a IT6 T/C card for me control the temp. Any help would be great. Thanks.