Posted 6 Apr 2011 I have an application where a desired temperature range is required. The thought of the engineer is to have a VFD running the fans but I am limited on what I have found that applies. I have single phase 120VAC drives and fans, which present no problems. The trick comes in that the fans need to have Ionization built in for purposes of air quality and the drives will negatively affect their performance. Any products or ideas would be greatly appreciated. Share this post Link to post Share on other sites
Posted 11 Apr 2011 How tight is the temperature range? Could you do it with a two or three speed fan? Share this post Link to post Share on other sites
Posted 11 Apr 2011 We had thought of that but it is a tight range so switching between two or three speeds could just end up causing an oscillation in the process. Share this post Link to post Share on other sites
Posted 11 Apr 2011 What about using an air conditioner with ionizing fans? Share this post Link to post Share on other sites
Posted 11 Apr 2011 not a bad idea either unfortunately we are constrained on size because this is part of a product line. We are using the moving air to regulate some elements that have a peak output at less than normal operating temperature. The goal is to try to reduce the temp enough to increase the output and speed up the line's capability at low cost and size. Share this post Link to post Share on other sites
Posted 16 Apr 2011 Have you tried using a loop powered RTD transmitter into the VSD? I have used this in the past to drive the VSD up and down in a tunnel type power station underground - Military. Share this post Link to post Share on other sites
Posted 16 Apr 2011 Yes, a lot of vfds have a PID function available. Good suggestion! Share this post Link to post Share on other sites