![]() ![]() Because we loose one of the DOL fans and the VSD controlled fan is essentially at 0% the temperature ramps up very quickly to a level that is not acceptable. ![]() On my first attempt I am having issues when the temperature is high and one of the DOL fans turns off. On the flip side if two DOL fans are running and the temperature creeps up I want the VSD to start from 0% and ramp up until the temperature is again stable. If the VSD drops to 0% then I would like to turn off one of the DOL fans and restart the VSD at 100% and continue to ramp it down until the temperature is stable. Say we have all three fans on and the temperature begins to fall below setpoint the VSD will ramp down to maintain the temperature. What I would like to do is use the VSD controlled fan to "smooth" out the control of the system. Obviously this ON/OFF controller has issues with oscillation and over/undershooting setpoint. The unit consists of three fans with one connected to a VSD, the other two are DOL.Ĭurrently the temperature is controlled by turning off a fan when temperature gets too low and turns on a fan when the temperature gets too high. We have a Chiller Unit here on site that needs to maintain a setpoint temperature. I am a huge fan of the forum and would appreciate any feedback. As I am reality new to PID loops I am struggling somewhat. I have a PID control application that I would like to get your opinions on. ![]()
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