Product Description:

The 25.F5.A1U-91-A is an AC axis drive manufactured by KEB as part of the F5 Combivert Axis Drives series. Designed for multi-axis production lines, the unit converts a fixed 400 V line supply into a variable output that synchronizes speed and torque on large induction or synchronous motors. A braking transistor with resistor monitoring is installed, allowing the drive to manage dynamic deceleration energy through a monitored braking resistor. This configuration is suitable for presses, winders, and gantry stages that experience frequent start-and-stop cycles.

Its power section accepts a nominal three-phase input of 400 V at 231 A and supplies a continuous output of 210 A to motors rated up to 110 kW. For acceleration peaks, the current can rise briefly to 263 A, while the IGBTs support switching frequencies as high as 8 kHz for refined torque control. A standard control board stores parameters and manages fieldbus connections, while heat sink cooling is incorporated into the U housing associated with the size 25 inverter. Protection includes a 315 A line fuse and a 315 A internal overcurrent threshold that trips before excessive stress damages the power devices. The chassis measures 355 mm deep, 340 mm wide, and 800 mm high, providing space for the cooling fins and accessory slots.

During continuous operation, the drive uses a nominal switching rate of 4 kHz to balance power conversion performance, heat generation, and acoustic output. The enclosure has an IP20 rating that protects against accidental contact with live parts while allowing cabinet airflow around the heat sink. The open enclosure design requires installation within a suitable control cabinet that limits exposure to moisture, dust, and foreign objects. Weighing 75 kg, the chassis requires firm panel support during installation. The braking transistor and standard control board are accessible from the front, allowing service access without removing the drive from its mounted position.