The Allen-Bradley PowerFlex 400 is an adjustable frequency AC drive engineered for variable torque applications in commercial HVAC systems. Optimized for fan and pump loads, it delivers precise speed and torque regulation through advanced motor control with open-loop and closed-loop capabilities. The drive reduces energy consumption by matching motor speed to instantaneous load demand, minimizing wasted power in building systems.
Technical Specifications
• Control Methods: Sinusoidal PWM and Volts/Hertz
• Motor Control: Open-loop and closed-loop operation
• Motor Overload Protection: Class 10
• Motor Over-Temperature Protection: Supported
• Display: 2-line, 16-character LCD keypad
• System Output Range: 0% to 400% (with auxiliary motor control)
• Programmable Skip Frequencies: Three selectable resonant frequency avoidance points
– Key Features
• Integral PID control loop maintains process variables at user-defined set points
• Embedded damper control logic eliminates external hardware requirements
• Auxiliary motor control enables up to three line-started motors to operate alongside the drive-controlled motor
• Fire control system integration via dedicated input for override capability
• Purge input initiates operation at programmable speed, overriding stop commands from communication ports
• Function loss input supports interlock with cooling coils and fire alarm systems
• Sleep/Wake function cycles drive off at low demand thresholds and restarts automatically
• Flying start capability enables smooth motor restart without full deceleration
• Selectable fan and pump curves provide optimized voltage patterns for centrifugal loads
• Configurable Hand/Off/Auto function buttons
• Digital speed increase/decrease control
• Parameter files organized by function for efficient programming
• LED indicators display system configuration and fault status
• Field-installable auxiliary relay board (Frames D–H) with six programmable Form A relays
– Typical Applications
Commercial fan and pump systems in HVAC applications, including variable air volume (VAV) boxes, chilled water loops, condenser water systems, and smoke evacuation fan networks.
– Compatibility & Integration
Supports integration with building automation systems, fire/life safety panels, and cooling coil interlocks. Compatible with various motor types through flexible control architecture.
