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DANFOSS New A4 Compact Enclosure With IP 55 / IP 66 Protection Rating

Reduced installed dimensions and time-saving installation

For the Danfoss frequency converter families VLT« AutomationDrive, HVAC Drive and Aqua Drive with power ratings up to 4 kW, a new and especially compact IP 55 / IP 66 enclosure with type designation A4 is available. Compared with the existing A5 enclosures, the size of the A4 enclosure is 33% smaller. Nevertheless, the power components fulfil the most demanding requirements, even in applications with high overload torque, long motor cables, or ambient temperatures up to 50 ░C (maximum). Danfoss reached this size reduction through the use of modern components with optimized efficiency, and a completely newly developed cooling technology.

Optimised unit design
Although the new A4 design may initially appear very similar to the existing A5 enclosures, improvements to many practical details have been implemented. Nevertheless, all of the elements of a typical VLT« drive configuration, such as an RFI filter compliant with EN 55011 Class A1/B, a mains interference suppression choke, and the brake module, are integrated in the unit to avoid additional installation expenditures for external components.

Time-saving installation
During development, special attention was given to accessibility and time-saving installation. For example, the mechanical fastening points are readily accessible from the front, and the fasteners can be operated using automatic tools. The terminal clamps are arranged to enable installation of the cabling with the simplest possible work sequence. The cable entry in the base is available with a choice of metric or non-metric threads. Additionally, all terminal clamps are fitted with a protective cover and the necessary fittings are included with the unit.

Modular design for an economical solution
For optimal adaptation to individual applications, two A/B extension slots are provided. They can be used for communication interfaces such as Profibus, Profinet, Ethernet I/P or CANopen, as well as a module for additional inputs and outputs. Danfoss supplies the converter fully assembled and tested.

Robust design in a compact package
The new A4 enclosure is available in IP 55 (NEMA 12) and IP 66 (NEMA 4X) versions, and it extends the existing product line. Power components rated at up to 4 kW are available for input voltages of 380ľ 480/500 V.

In addition, there are numerous options available so that the converter configuration can be optimised to suit individual applications. The units can also be easily retrofitted with A, B and D options at any time.

On request, the unit can be equipped with a lockable master switch with an auxiliary contact. Units with power ratings up to 1.5 kW are convection cooled (no external fan).

Email: drivesuk@danfoss.com


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Hill Farm, Linton Hill, Maidstone, Kent ME 17 4AL
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