12.56.211 KEB
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The 12.56.211 frequency converter is manufactured by KEB as part of the F5 Combivert Axis Drives series and offers a general maximum motor power of 5 HP with a rated current of 9.0 Amps. It features a braking transistor, operates with three input phases, and is protected to IP00 standards. The unit supports rated input voltages of 380 to 415 Volts at 50 or 60 Hz and can be installed at site altitudes up to 3000 meters.
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Product Description:
The 12.56.211 is a frequency converter manufactured by KEB within the F5 Combivert Axis Drives series. It serves as an adjustable-speed interface that modulates voltage and frequency for three-phase induction motors, allowing production machinery to accelerate, decelerate, or hold a constant speed according to process demands. Positioned between the plant mains and the motor terminals, the unit contributes to energy conservation, smoother starts, and tighter torque regulation in automated cells and conveyor systems.
This converter is sized for motors up to 5 HP, aligning its thermal and switching capacity with small and mid-range drives. The power section is designed for a line supply of 380/415 V three-phase, so it matches common industrial distribution grids without a step-down transformer. During continuous operation, it draws a rated current of 9.0 A, and its silicon junctions and bus capacitors are sized for a rated apparent power of 5.5 kVA. The control logic maintains carrier frequency and vector calculations across either 50/60 Hz mains, avoiding timing errors when the plant alternates between utility or generator sources. Size code 12 indicates the mechanical frame, heat sink area, and terminal pitch used for wiring, while the built-in braking transistor shunts regenerative energy to an external resistor to keep the DC bus voltage below trip limits.
Environmental and installation parameters complement the electrical data. An open-chassis rating of IP00 means the drive must be mounted inside a protected control cabinet where airflow is directed across its fins. Upstream protection is provided by a 20 A mains fuse, coordinating with the semiconductor short-circuit rating. The inverter delivers motor voltage on a three-phase bus described as 3 x 0-UMains, enabling full output modulation from zero to the incoming line level. Field terminals accept conductors up to 2.5 mm², and operation is permitted at site elevations up to 3000 m without current derating.
