Description
Application Scenarios
In a large commercial office tower, the HVAC system’s supply and return fans must modulate airflow continuously based on real-time building occupancy and outdoor temperature conditions. The building automation system issues speed commands via BACnet, but without precise motor control, the fans would run at fixed speeds, wasting significant energy during low-demand periods. The 22C-D170A103 serves as the critical interface between the BAS and the fan motors, converting speed reference signals into variable frequency output that matches actual load requirements. When a sudden pressure imbalance occurs in the ductwork, the 22C-D170A103‘s built-in PID control loop adjusts fan speed to maintain stable static pressure, preventing simultaneous over-pressurization and energy waste. For facility managers, this translates to measurable reductions in electrical consumption—often 30% or more in variable torque applications—while extending motor and belt life through soft-starting and reduced mechanical stress .
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | 22C-D170A103 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | AC Variable Frequency Drive |
| Power Rating | 90 kW (125 HP) at 480 VAC, 3-phase |
| Output Current | 170 Amps |
| Input Voltage | 480 VAC, 3-phase, 50/60 Hz |
| Enclosure Rating | IP30 / NEMA Type 1 (panel mount) |
| Frame Size | Frame F |
| User Interface | Integral fixed keypad with LED display |
| Communication | RS-485, embedded Modbus RTU, support for DSI modules (BACnet, EtherNet/IP, DeviceNet) |
| Control Method | V/Hz control with slip compensation, PID control |
| Weight | Approximately 73.5 kg |
Technical Principles and Innovative Values
- Innovation Point 1: Purpose-Built Variable Torque Optimization. Unlike general-purpose drives that compromise performance across load types, the 22C-D170A103 is specifically tuned for quadratic torque fan and pump loads. This allows the drive to deliver optimal energy savings during part-speed operation without oversizing the power section for constant torque demands, reducing both initial cost and cabinet footprint .
- Innovation Point 2: Integrated Building Automation Connectivity. The 22C-D170A103 embeds Modbus RTU and supports optional BACnet, Metasys N2, and Apogee FLN P1 protocols through DSI communication modules. This eliminates the need for external gateways when integrating with building management systems, reducing wiring complexity and commissioning time in HVAC retrofit projects .
- Innovation Point 3: Purge and Damper Input Logic. For combustion air fan applications, the 22C-D170A103 includes dedicated purge and damper control inputs that sequence fan operation with burner management systems. This built-in interlock capability ensures safe pre-purge cycles without requiring separate PLC logic, simplifying installation in boiler and furnace applications
