Specifications include, but are not limited to: 1. The AFD’s shall be rated for 480 VAC (optional input voltage of 208, 240 VAC through 125 HP). The AFD shall provide microprocessorbased control for three-phase induction motors. The controller’s full load output current rating shall be based on a low overload application at 40° C ambient and 1.05 – 10 kHz switching frequency with automatic switching frequency de-rating in case of overload. 2. The AFD’s shall be of the Pulse Width Modulated (PWM) design converting the utility input voltage and frequency to adjustable voltage and frequency output via a two-step operation. Adjustable Current Source AFD’s are not accepted. Insulated Gate Bipolar Transistors (IGBT’s) shall be used in the inverter section. Bipolar Junction Transistors, GTOs or SCRs are not accepted. The AFS shall run at the above listed switching frequencies. 3. The AFD’s shall have an efficiency at full load and speed that exceeds 97%. The efficiency shall exceed 90% at 50% speed. 4. The AFDs shall maintain a minimum line side displacement power factor of .096, regardless of speed and load for motors greater than 75 HP. 5. The AFDs shall have a one (1) minute overload current rating of 110% for low over load applications. 6. The AFDs shall be capable of operating any NEMA design B squirrel cage induction motor, regardless of manufacturer, with a horse power and current rating within the capacity of the AFD. 7. The AFDS shall have an integral EMI/RFI filter as standard.