Danfoss VLT Ea4, Operating Manual

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As required by the EU Directive 2014/34/EU, any electrical or electronic device intended for use in an environment with a potentially
explosive mixture of air, flammable gas, or dust must be ATEX-certified. Systems operated in this environment must fulfill the fol-
lowing special conditions to comply with the ATEX protection class:
Class d specifies that if a spark occurs, it is contained in a protected area.
Class e prohibits any occurrence of a spark.
4.4 Installation Requirements
4.4.1 Thermal Considerations
For heat dissipation values, refer to 7.1 Electrical Data, 380–500 V AC . The following heat sources must be considered when deter-
mining cooling requirements:
Ambient temperature outside enclosure
Filters (for example, sine-wave and RF)
Fuses
Control components
4.4.2 Cooling Requirements
N O T I C E
OVERHEATING
Improper mounting can result in overheating and reduced performance.
Install the drive following the installation and cooling requirements.
The drive module is equipped with a heat sink fan, which provides the required flow rate of 994 m3 /h (585 cfm) across the heat
sink. Also, there are 2 cooling fans mounted on the top of the unit, which provide the required flow rate of 595 m3/h (350 cfm).
Typical enclosure designs utilize door fans along with the drive module fans to remove heat/losses from the enclosure.
The drive module utilizes back-channel cooling concept that removes heat sink cooling air. The heat sink cooling air carries approxi-
mately 90% of the heat out of the back channel of the drive. Redirect the back-channel air from the panel or the room by using
either:
Back-channel cooling kits to direct the heat sink cooling air out of the panel when IP20/Chassis drives are installed in Rittal en-
closures. Use of these kits reduce the heat in the panel, allowing for smaller door fans.
Back-wall cooling kits that provide top and base covers, allowing back-channel cooling air to be ventilated out of the room.
N O T I C E
When the back channel option is not used, fans mounted in the cabinet must remove all the heat generated inside the enclosure.
Make sure that the total flow of the cabinet fans meets the recommended airflow.
4.4.3 Busbars
Align busbars vertically to provide maximum airflow. See Table 2 for the rated rms current used for defining the minimum cross-
section of customized busbars.
Table 2: Customized Busbar Specifications
Busbar Rated rms current [A]
Mains 2072
Motor 2150
DC bus 2393
AQ434333248451en-000101 / 130R1286 18 | Danfoss A/S © 2023.01
Mechanical Installation
VLT Ea4 Parallel Drive Modules
Operating Guide