Allen-Bradley PowerFlex 525 25B-D037N114 18.5 kW AC Drive

An 18.5 kW dual-rated PowerFlex 525 in Frame E

The Allen-Bradley 25B-D037N114 is an 18.5 kW (25 HP) normal-duty PowerFlex 525 with a heavy-duty rating of 15 kW (20 HP), 37.0 A output current and Frame E packaging. It is used for larger pumps, fans, compressors and conveyors that need the control and safety functions of the 525 platform on motors above 15 kW. Dual overload ratings are available above 15 HP: 110 percent for 60 seconds and 150 percent for 3 seconds in normal duty, and 150 percent for 60 seconds and 180 percent for 3 seconds in heavy duty.

Frame E is 185 mm wide, 300 mm high and 279 mm deep, weighs 12.9 kg and is screw-mounted only. An internal DC bus choke is fitted in the Frame E 20 to 25 HP heavy-duty ratings.

Technical specifications

Heat, protection and mounting

The 602 W loss makes thermal design important for the Frame E drive. Allow for panel ventilation, observe the derating curves above 50 °C, and consider the control module fan kit for operation to 70 °C with derating. Sound pressure is 68 dBA at 1 m. Rockwell lists 70 A maximum Class CC, J or T fuses and the 140MT-F9E-C45 manual motor controller, with the 140G-G6C3-C50 molded-case breaker in the IEC table.

The 37 A model is only offered as a filtered drive. Rockwell notes that you must verify the application supports a filtered drive before choosing this 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-D037N114

• Dual duty rating on one hardware: 18.5 kW for variable-torque loads such as centrifugal pumps and fans, or 15 kW where a constant-torque load needs higher overload.
• Five motor control modes, from simple V/Hz up to closed-loop velocity vector and permanent-magnet motor control.
• Integral EMC filter and an internal DC bus choke in this rating, which reduces the external hardware needed in the panel.
• Built-in Safe Torque Off up to PLd / SIL CL2 without an additional safety option module.
• Removable control module, so the control wiring and parameters can be prepared before the power section is installed.
• Pulse input up to 100 kHz for speed reference from an encoder or upstream controller.

Normal duty or heavy duty?

The choice depends on how the load behaves at start-up and during operation, not on the motor power alone. A centrifugal pump or fan needs little torque at low speed and rarely demands overload, so the 18.5 kW normal-duty rating with 110 % for 60 seconds is adequate. A loaded conveyor, mixer, extruder or positive-displacement pump can need full torque from standstill and repeated overload; for these, apply the heavy-duty 15 kW rating with 150 % for 60 seconds. If an existing 18.5 kW motor drives a constant-torque load, the 22 kW model 25B-D043N114 is the safer selection.

Commissioning notes

The PowerFlex 525 includes application-oriented start-up groups on the keypad and can also be configured with Rockwell’s Connected Components Workbench software, which allows parameter files to be prepared offline. Enter the motor nameplate data first, select the control mode, then run an autotune for sensorless vector operation. On an EtherNet/IP network the drive can be integrated into a Logix controller project, so parameters are stored with the PLC program.

Wiring and protection

• Size the supply cable and protective device from the input current and the fuse or breaker data in the specification table.
• Use screened motor cable bonded at both ends to keep emissions within the filter’s performance.
• Keep control wiring separated from power wiring and use the STO terminals only as described in the safety documentation.

Installing in Oman and GCC panels

With 602 W of losses, two or three of these drives in a closed enclosure can quickly push the internal temperature above 50 °C during a Gulf summer. Plan cooling around the actual losses: filter fans only work when ambient air is cool enough, while outdoor or poorly ventilated rooms often need an enclosure air conditioner. The IP20 open-type construction also requires a dust-tight enclosure in sandy locations, and air filters must be cleaned regularly to maintain air flow through the heatsink.

What to include in your RFQ

• Catalog number 25B-D037N114 and the quantity.
• Motor nameplate power, current and the type of load, to confirm the duty rating.
• Required communication option, such as an additional fieldbus card.
• Accessories such as the control module fan kit, keypad or line reactor if specified.
• Delivery location in Oman or elsewhere in the GCC.

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.