Allen-Bradley PowerFlex 525 25B-D043N114 22 kW AC Drive

The 22 kW top rating of the PowerFlex 525

The Allen-Bradley 25B-D043N114 is the largest PowerFlex 525 for 380 to 480 V supplies, rated 22 kW (30 HP) in normal duty and 18.5 kW (25 HP) in heavy duty with 43.0 A output current. It shares Frame E with the 18.5 kW 25B-D037N114, so panel dimensions are the same, but it offers a 16 percent higher continuous current. Typical uses are 22 kW pumps, blowers, cooling-tower fans and conveyors where the user wants the same programming and safety features as the smaller drives.

The control module is the same standard module used across the whole range, which keeps parameter files portable between sizes through USB MainsFree programming.

Technical specifications

Selecting protection and cooling

Total drive loss is 697 W, the highest in the 400 V range. Verify the panel cooling and the 4.0 kHz carrier rating basis, since a higher carrier frequency reduces available current. For protection Rockwell lists the 100-C60 contactor, Class CC, J or T fuses to 80 A in the UL table, IEC fuses of 50 to 80 A, the 140MT-F9E-C45 manual motor controller and the 140G-G6C3-C60 molded-case breaker.

Frame E is screw-mounted only, and the storage temperature range for Frame E is -40 to +70 °C, narrower than the -40 to +85 °C of Frames A to D. Confirm that the supply cable and motor are matched to the 43 A rating.

Catalog code and family ratings

Reading the catalog number: 25B is the PowerFlex 525, D is the 380…480V 3-phase supply, the next group is the output current code, N is the IP20 open enclosure, 1 is the standard interface, and the following digit is the emission class: 1 means an integral EMC filter and 0 means no filter. The last digit 4 is the version.

Key features of the 25B-D043N114

• Dual rating: normal duty for variable-torque loads such as centrifugal pumps and fans, heavy duty for constant-torque loads such as conveyors and mixers.
• Embedded EtherNet/IP port on the PowerFlex 525 range for integration with Logix controllers.
• Safe Torque Off built in, reducing the need for external contactors in many machine safety designs.
• Removable control module that can be configured over USB before the power module is installed.
• Integral EMC filter on this rating, helpful where the supply also feeds sensitive equipment.
• Several motor control modes including permanent-magnet motor control for high-efficiency motors.

Sizing the drive to the motor

Select the drive on motor current, not only on kilowatts. A 22 kW four-pole motor at 400 V usually draws a nameplate current within the 43 A continuous output of this drive in normal duty, but motors with lower efficiency or power factor, or those operating at 380 V, can draw more. Check the nameplate full-load amps against the drive rating, and move to heavy duty or the next larger frame where the load needs high starting torque, frequent acceleration or sustained overload.

Cable and motor considerations

Long motor cables increase reflected voltage at the motor terminals and capacitive currents in the drive. For long runs, check the cable length limits in the Rockwell documentation and consider output reactors or filters. Shielded motor cable bonded at both ends helps contain emissions, and older motors not rated for inverter duty may need additional protection.

Installation in Oman and GCC conditions

High ambient temperature is the main factor for drives in the region. The drive runs without derating up to 50 °C, but enclosure temperature rises above outside air because of the 697 W loss at full load. Size panel cooling, whether filtered fans or air conditioning, to remove this heat, and allow for solar gain on outdoor panels. Fine sand and dust clog filters and heat sinks, so a maintenance plan for filter replacement is important. Typical regional applications include water pumping stations, irrigation, HVAC chilled water and condenser pumps in commercial buildings, cooling tower fans, and process conveyors in cement, food and mining plants.

Commissioning tips

• Enter motor nameplate data and run an autotune before selecting sensorless or velocity vector control.
• Set acceleration and deceleration times to suit the load; long decel on high-inertia fans avoids overvoltage faults.
• Use the sleep-wake and PID functions for pressure-controlled pump systems.
• Save the final parameter set to file using Connected Components Workbench or the USB connection for quick replacement.

Maintenance

• Inspect and clean heat sink and fans at regular intervals, more often in dusty sites.
• Check terminal tightness after the first months of operation and during planned shutdowns.
• Review the fault log for recurring overcurrent or overtemperature events that indicate a load or cooling problem.

Information to include in an RFQ

• Catalog number 25B-D043N114 and quantity.
• Motor data: power, voltage, full-load current and the type of load.
• Accessories needed: input fuses or breaker, line reactor, communication options, control module fan kit.
• Enclosure requirements if a complete panel is wanted.
• Delivery site and required date.

Documents and quotation

Seven Star LLC supplies PowerFlex 525 drives against the full catalog number. The Rockwell Automation PowerFlex 520-series specifications document is attached. Compare with the Allen-Bradley PowerFlex 525 page and see the AC drives category. Confirm the exact catalog number, series letter and firmware or hardware revision on the product label, and the compatibility with your existing system, before ordering. Stock and lead time are confirmed at quotation.