How should I apply variable-frequency drive/s (VFD/s) to a Tower Tech Modular Cooling Tower?
The simplest solution is a stand-alone system with a single VFD supplying input to our optional motor control panel. The motor control panel is available with an optional analog output module to supply either 4-20 mA or 0-10 volt output speed control to the VFD. The optional control panel can be equipped with a pre-programmed Programmable Logic Controller (PLC), single point wiring to a face-mounted disconnect, individual motor starters with magnetic and thermal overload protection, face-mounted HOA switches for each fan motor, and a RTD temperature sensor for remote mounting in a thermal well in the tower’s discharge piping. If the VFD is installed with a line voltage bypass, an auxiliary contact on the bypass contactor will tell the PLC to take control of the fans using fan cycling to control outlet temperature. In cases where a Building Management System (BMS) is to be used to control and monitor the condenser water system, we recommend that temperature sensors and control outputs f
