Regen Overview; Back-Channel Cooling Overview - Danfoss VLT AQUA Drive FC 202 Design Manual

Product Features
that can be connected in this way is infinite, 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 configuration requires specific considerations.
•
The drive is powered exclusively from a DC source. This configuration requires:

5.12 Regen Overview

5 5
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 efficient 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
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. Different back-channel cooling kits are available to redirect the airflow based on individual needs.
5.13.1 Airflow for D1h–D8h Enclosures
Figure 5.17 Standard Airflow Configuration for Enclosures D1h/D2h (Left), D3h/D4h (Center), and D5h–D8h (Right).
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- A DC source.
- A means to soft charge the DC bus at power-up.
225 mm (8.9 in)
225 mm (8.9 in)
Danfoss A/S © 01/2018 All rights reserved.
®
VLT AQUA Drive FC 202
225 mm (8.9 in)
225 mm (8.9 in)
®
drive. This back-
225 mm (8.9 in)
225 mm (8.9 in)
MG22B222