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that can be connected in this way is innite, as long as each unit has the same voltage rating. In addition,

depending on the size and number of units, it may be necessary to install DC reactors and DC fuses in the DC-link

connections, and AC reactors on the mains. Attempting such a conguration requires specic considerations.

•

The drive is powered exclusively from a DC source. This conguration requires:

- A DC source.

- A means to soft charge the DC bus at power-up.

5.12 Regen Overview

Regen typically occurs in applications with continuous braking such as cranes/hoists, downhill conveyors, and centrifuges

where energy is pulled out of a decelerated motor.

The excess energy is removed from the drive using 1 of the following options:

•

Brake chopper allows the excess energy to be dissipated in the form of heat within the brake resistor coils.

•

Regen terminals allow a third-party regen unit to be connected to the drive, allowing the excess energy to be

returned to the power grid.

Returning excess energy back to the power grid is the most

ecient use of regenerated energy in applications using

continuous braking.

5.13 Back-channel Cooling Overview

A unique back-channel duct passes cooling air over the heat sinks with minimal air passing through the electronics area.

There is an IP54/Type 12 seal between the back-channel cooling duct and the electronics area of the VLT

drive. This back-

channel cooling allows 90% of the heat losses to be exhausted directly outside the enclosure. This design improves

reliability and prolongs component life by dramatically reducing interior temperatures and contamination of the electronic

components. Dierent back-channel cooling kits are available to redirect the airow based on individual needs.

5.13.1 Airow for D1h–D8h Enclosures

130BG068.10

225 mm (8.9 in)

Figure 5.17 Standard Airow Conguration for Enclosures D1h/D2h (Left), D3h/D4h (Center), and D5h–D8h (Right).

Product Features

VLT

AQUA Drive FC 202

Danfoss VLT AQUA Drive FC 202 Design Manual

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