This car wash had requested rebates from Consumers Energy (the local electric utility) for installation of Variable Frequency Drives (VFD) on its car wash dryers. It uses 12 dryers, each 15 hp. Historically this car wash has had a lot of trouble with motors, has tried soft starts and abandoned them, and has had a programmable logic controller (PLC) installed to sequentially start the dryer motors after a single input signal from its Datatrax controller. The dryer motors are left running as long as there is a car in the tunnel. read more...