Combining DTC with line braking

ABB’s new AC drive combines accurate speed control and direct torque control (DTC) with line braking for regenerative applications such as cranes, centrifuges and winding machines.

The ACS 611 incorporates two inverters in one frame. An active inverter replaces the usual diode rectifier on the incoming AC power, reducing harmonics and delivering a virtually sinusoidal supply.

This extra inverter also enables full four quadrant operation and a two way flow of energy, which means the drive can divert excess energy from a braking motor back into the electrical system.

ABB Industrial Systems Tel: 01438 742366