Product Description:

The 21.F5.A1R-YB53 is an AC axis drive produced by KEB for the F5 Combivert Axis Drives series. It is an inverter-size 21 model with the R housing form factor and a standard control board. This unit governs induction or synchronous motors up to 60 HP, delivering closed-loop speed and torque regulation for conveyors, extruders, and other automated machinery in multi-axis production lines. It is intended for coordinated axis control where stable speed response and repeatable torque output are required during continuous operation.

The drive operates from a 3-phase supply and accepts line voltages from 305 to 528 V, while its rated input is 400 V and it also supports the UL 480 V category. At nominal conditions, it supplies 90 A of output current, which corresponds to a rated apparent power of 62 kVA. The internal IGBTs switch at a factory default of 4 kHz, and the device can modulate the motor terminals from 0 to Uin on each phase to match load demand. These electrical values allow the inverter to operate on common industrial power systems while maintaining fine pulse-width resolution for precise motor flux control. Standard mains frequencies of 50 Hz or 60 Hz ±2 Hz are supported without derating, and the built-in braking transistor interfaces with external resistors to dissipate regenerated energy.

The braking channel can conduct up to 200 A when a resistor of at least 5 Ω is installed, helping prevent DC-link overvoltage during rapid deceleration. For brief overloads, the output stage tolerates a short-time current of 135 A, and an overcurrent trip is set at 162 A to protect semiconductor devices. When higher dynamic bandwidth is needed, the switching frequency may be increased to a ceiling of 16 kHz, provided the heat sink temperature remains below 90 °C. Rapid deceleration can return energy to the DC bus, so the braking channel is used during frequent stopping or sharp speed changes.