Tuesday, 20 November 2018
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Small expense – big effect

Whether cranes, centrifuges or lifts: where a braking resistor is replaced and the excess energy generated is to be fed back into the grid, the R1000 Yaskawa regenerative unit is an especially efficient solution.

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The R1000 Yaskawa regenerative unit. (Source: Yaskawa)

During the design of the R1000 model, which has been on the market for a year, additional features were deliberately dispensed with, such as those included in the D1000 regenerative converter and U1000 compact matrix converter.

As a result, the R1000 regenerative unit can be set up for precisely the braking energy value you want to feed back in. Consequently, the device can be designed to be a little smaller. This makes the solution correspondingly cheaper.

Increase in production efficiency

Additional features, such as throttles and fuses, round off the R1000 regenerative unit as a complete system. It is connected to the intermediate circuit of the frequency inverters. The drive system can operate in four-quadrant mode. Consequently, it can retransmit energy in both rotation directions both from the grid to the motor as well as back during braking.

At full load capacity, this results in shorter machine cycles and an increase in production efficiency. The total energy requirement of the lift falls simultaneously, because the regenerated energy can be consumed by other loads in the same lift.

Braking energy, such as that created during the downward motion of escalators, has up to now been released chiefly as warmth. This not only wastes energy. It also has to be dissipated at considerable expense. By contrast, regenerative systems permit retransmitting the generated energy to the grid and can in this way continue to be used in an energy- and cost-saving manner.

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