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d. Acceptable manufacturers: 1) Allen Bradley. 2) Toshiba International Corporation. I 3) Robicon. e. Output rating 3-phase; 6 to 66 Hz, with torque constant as speed changes. f. Unit Operating Requirements: 1) Input AC voltage tolerance of 380 to 500 V, plus or minus 10 percent. 2) Input frequency tolerance of 50/60 Hz, plus or minus 6 percent. 3) Capable of driving full load, under the following conditions, without derating: i. Ambient Temperature: 0 to 40oC. ii. Humidity: Less than 90 percent (non-condensing). iii. Altitude: 3300 feet. 4) Minimum Efficiency: 96 percent at 60 Hz, full load. 5) Minimum Displacement Primary-Side Power Factor: 96 percent. 6) Overload Capability: 1.1 times the base load current for 60 seconds, 2.0 times the base load current for 3 seconds. 7) Starting Torque: 100 percent of rated torque or as indicated. 8) Speed Regulation: Plus or minus 1 percent. 9) Isolated control interface to allow controller to follow control signal over an 11:1 speed range. g. Internal Adjustability Capabilities: 1) Minimum Speed: 5 to 25 percent of maximum rpm. 2) Maximum Speed: 80 to 100 percent of maximum rpm. I 3) Acceleration: 2 to a minimum of 22 seconds. 4) Deceleration: 2 to a minimum of 22 seconds. 5) Current Limit: 50 to a minimum of 110 percent of maximum rating. h. Self-Protection and Reliability Features: 1) Input transient protection by means of surge suppressors. 2) Snubber networks to protect against malfunction due to system voltage transients. 3) Under- and over-voltage trips; inverter overtemperature, overload, and overcurrent trips. 4) Motor Overload Relay: Adjustable and capable of NEMA 250, Class 20 performance. 5) Notch filter to prevent operation' of the controller-motor-Ioad combination at a natural frequency of the combination. 6) Instantaneous line-to-Iine and line-to-ground overcurrent trips. 7) Loss-of-phase protection. 8) Reverse-phase protection. 9) Short-circuit protection. 10) Motor overtemperature fault. i. Multiple-Motor Capability: Controller suitable for service to multiple motors and having a separate overload relay and protection for each controlled motor. Overload relay will shut off controller and motors served by it when overload relay is tripped. J. Automatic Reset and Restart: To attempt three restarts after controller I fault or on return of power after an interruption and before shutting down for manual reset or rotating loads spinning in either direction and