The Delta-1 is one of the possible variable frequency drives (VFD) that can be used with the Trolmaster VFD-1 module. The Delta-1 and VFD-1 can be used with the TrolMaster Hydro-X Pro system to control the speed of three-phase AC motors (industrial fans, etc.). An RJ45 cable is included to connect the Delta-1 to the TrolMaster VFD-1 module. This custom version has all the necessary parameters pre-configured, ready to work with the VFD-1 module right out of the box.