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  PowerFlex 400 AC drives are designed to meet global OEM, contractor and end user demands for flexibility, space savings and ease of use. The PowerFlex 400 AC drive is a cost-effective solution for speed control in variable torque fan and pump applications. • Power ratings of 2.2...250 kW/3.0...350 Hp at 380-480V and 2.2...37 kW/3.0...50 Hp at 200-240V • Integral PID controller allows a process variable to be maintained by automatically adjusting the output frequency • Three programmable skip frequencies and bands prevent the drive from running continuously at resonant speeds, which could cause mechanical breakdowns • Selectable fan/pump curves provide reduced voltage patterns for centrifugal fan and pump loads • Sleep function allows the drive to be cycled off when the system demand drops below a preset level and to be restarted automatically when the demand increases • For applications that require unattended operation, the Start at Power Up function provides the ability to resume running after power is restored after a power outage • Connection to fire and life safety systems via freeze/fire and purge inputs • Auxiliary motor control allows staging of additional line-started motors to meet system demand • Damper input can be used to disable the drive output until desired damper position is obtained, even with a valid run command