Power Experience with AC/DC drives and motors, low to medium voltage utilization, variable-frequency drives (VFD)/adjustable-frequency drives (AFD), variable speed drives, instrumentation and controls, NEC codes/guidelines, motor circuits, transformers, switchboards, motor control centers, main switches, lighting circuits, load control, 3/single phase power, power panel schedules, etc. Industrial Control Devices Solid knowledge of devices commonly used in the industrial automation field which include solenoid valves, pneumatic systems, relays, motor starters, variable frequency drives (VFDs), photo eyes, motors, pushbuttons, safety switches, pressure transmitters, flow meters, temperature sensors, disconnect switches, safety devices, and the like.