Profile: Control Works Inc. specializes in control equipments. Our product line includes custom & repetitive panels, control work remote monitors, CW6CDC and variable frequency drive (VFD)-4000 controllers. Our CW6CDC controller is a simple, easy-to-use microprocessor-based controller which monitors any 4-20 mA signal. This controller has six programmable relay outputs that can be used for control and alarm. The transducer input zero and span are fully configurable. Its simulation mode allows the user to test the set points and relay operation. Our VFDC-400 microprocessor-based controller is specifically designed for constant pressure applications using variable frequency drives (VFD). The VFDC-4000 is capable of controlling up to four VFDs. It is featured with P.I.D. control, automatic alternation, data logging, and communication capabilities.