Mitsubishi FR-BU2-15K Braking Unit for FREQROL FR Drives

The Mitsubishi FR-BU2-15K (FR-BU2-15K) is an external discharge braking unit engineered for use with Mitsubishi FREQROL FR series variable frequency drives. Operating as a critical component in inverter-driven automation architectures, this braking unit is designed to handle regenerative energy generated during motor deceleration, rapid stopping, or overhauling loads. By channeling excess electrical power from the drive DC bus to external braking resistors, the unit prevents DC bus overvoltage faults and protects sensitive power semiconductor components from electrical stress. Engineered for 15 kW capacity applications, the FR-BU2-15K integrates seamlessly into FREQROL drive systems across industrial automation setups, including material handling systems, packaging equipment, conveyors, overhead cranes, and machine tool axes. Its dedicated internal control circuitry monitors DC bus voltage thresholds to activate braking operation precisely when required, ensuring stable and repeatable machine cycling. Compact terminal connections allow straightforward wiring to compatible Mitsubishi FREQROL FR series inverters and appropriate discharge resistors, making it an essential solution for maintaining equipment safety, dynamic performance, and continuous production uptime in demanding factory environments.