Description
Application Scenarios
A commercial greenhouse operation in California’s Central Valley was running 14 exhaust fans and 8 circulation pumps on electromechanical starters. Across-the-line starting caused frequent motor burnout, and fixed-speed operation wasted energy whenever outside conditions called for anything less than full output. The facility needed a cost-effective VFD solution for 30 HP fan motors and 25 HP pump motors, but the machines were standalone units with local operator control — paying for embedded EtherNet/IP networking would have added cost with no operational benefit.
The maintenance team deployed fourteen 25A-D043N114 drives on the exhaust fans and eight on the circulation pumps. The drive’s sensorless vector control and V/Hz modes allowed precise speed regulation matched to greenhouse temperature and humidity setpoints, cutting fan energy consumption by 38% compared with fixed-speed operation. The integrated EMC filter eliminated electrical noise that had previously interfered with the facility’s climate-control sensors. Most importantly, the modular design with a detachable control core let the team pre-configure all 22 drives on a workbench via USB while electricians simultaneously installed the power modules in the field — compressing a projected three-week installation timeline to just six days. With an operating envelope extending to 70°C (with current derating and a control module fan kit), the drives mounted in the greenhouse’s hot attic spaces required no additional cooling. Over two full growing seasons, the fleet recorded zero drive failures, and the energy savings paid back the entire investment in 14 months.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 25A-D043N114 |
| Manufacturer | Allen-Bradley / Rockwell Automation (USA) |
| Product Category | Adjustable Frequency AC Drive (VFD) |
| Series | PowerFlex 523 (Bulletin 25A, PowerFlex 520 family) |
| Lifecycle Status | Active (as of 2026); repairable/replaceable; standard 1-year warranty |
| Input Voltage | 380–480V AC, 3-Phase, 50/60 Hz (323–528V operating range) — covers global 400V and 480V industrial supplies |
| Rated Output Current | 43 A continuous — defines the maximum motor current the drive can sustain |
| Normal Duty Rating | 30 HP / 22 kW — for variable-torque loads such as fans and centrifugal pumps |
| Heavy Duty Rating | 25 HP / 18.5 kW — for constant-torque loads such as conveyors and mixers |
| Overload Capacity | Normal Duty: 110% × 60 s, 150% × 3 s; Heavy Duty: 150% × 60 s, 180% × 3 s |
| Max. Output Frequency | 500 Hz (programmable) |
| Control Methods | V/Hz, Sensorless Vector Control (SVC), Sensorless Vector with Economizer mode |
| Frame Size / Enclosure | Frame E; Panel Mount – IP20 / NEMA Open Type |
| EMC Filter | Integrated (included in the “N114” suffix configuration) — supports CE compliance |
| Communication | Integrated RS485 / DSI port (Modbus RTU, low-cost multi-drop networking); optional 25-COMM-E2P, 25-COMM-D, 25-COMM-P, 25-COMM-PNET2P adapters |
| Programming | USB port + Connected Components Workbench (CCW) + PowerFlex 520 USB application + standard integral HIM keypad with LED display and speed potentiometer |
| Brake IGBT | 7th IGBT brake included as standard — enables dynamic braking with an external resistor |
| I/O Configuration | 5 digital inputs, 2 digital (relay) outputs, 1 analog input, 1 analog output, 1 pulse-train input |
| Modular Design | Removable / detachable control core — configure offline, snap into power module for parallel deployment |
| Dimensions (W×H×D) | 185 × 300 × 279 mm (7.28 × 11.81 × 10.98 in) |
| Weight | Approx. 12.9 kg (28.4 lbs) per distributor data; Rockwell shipping weight approx. 15.7 kg |
| Total Power Loss | 697 W — the heat that must be removed from the enclosure at full load |
| Operating Temperature | –20°C to +50°C at full rating; up to 70°C (158°F) with current derating and control module fan kit |
| Mounting | Panel mount; side-by-side with 50 mm (1.96 in) air-flow gap top and bottom |
| Efficiency | Approx. 97.5% (typical) |
| Certifications | UL, cUL, CE, C-TICK, KC, RCM, UKCA, RoHS |
| UPC / Lead Time | 885630952475 / approx. 5 days (standard) |
