Schneider VW3A7101 Braking Unit 850 V

The Altivar B braking unit is an option for variable speed drives of Altivar range. The minimum resistor value to associate is 1Ohm. This braking unit allows Altivar 71 drives to operate while braking to a standstill or during “generator” operation, by dissipating the energy in the braking resistor. Its protection index is IP20. Thermal protection is provided by an integrated temperature probe. It weighs 30kg.

The braking resistor acts on the motor current and thus on its speed. By using this function it is possible to lower down the speed of motors during braking or even stop them without having to disconnect or cut off power from the motor contactors. This function can be used for applications where it would not be possible or convenient to use a contactor with automatic braking feature like in textile machines, presses etc..

The braking resistor operates by converting kinetic energy into heat when the motor is braked or stopped at low speeds (generative operation). In order for this feature to work properly, there must also be a functional brake circuit that includes an external stop switch and/or mechanical brakes (e-stop).

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