Air Humidity; Aggressive Environments - Danfoss VLT Series Design Manual

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VLT HVAC Drive Design Guide
2.3.3. Danfoss VLT Frequency Converter and CE Labelling
CE labelling is a positive feature when used for its original purpose, i.e. to facilitate trade within
the EU and EFTA.
However, CE labelling may cover many different specifications. Thus, you have to check what a
given CE label specifically covers.
The covered specifications can be very different and a CE label may therefore give the installer a
false feeling of security when using a frequency converter as a component in a system or an
appliance.
Danfoss CE labels the frequency converters in accordance with the low-voltage directive. This
means that if the frequency converter is installed correctly, we guarantee compliance with the
low-voltage directive. Danfoss issues a declaration of conformity that confirms our CE labelling in
accordance with the low-voltage directive.
The CE label also applies to the EMC directive provided that the instructions for EMC-correct in-
stallation and filtering are followed. On this basis, a declaration of conformity in accordance with
the EMC directive is issued.
The Design Guide offers detailed instructions for installation to ensure EMC-correct installation.
Furthermore, Danfoss specifies which our different products comply with.
Danfoss gladly provides other types of assistance that can help you obtain the best EMC result.
2.3.4. Compliance with EMC Directive 89/336/EEC
As mentioned, the frequency converter is mostly used by professionals of the trade as a complex
component forming part of a larger appliance, system, or installation. It must be noted that the
responsibility for the final EMC properties of the appliance, system or installation rests with the
installer. As an aid to the installer, Danfoss has prepared EMC installation guidelines for the Power
Drive system. The standards and test levels stated for Power Drive systems are complied with,
provided that the EMC-correct instructions for installation are followed, see section
stallation

2.4. Air humidity

The frequency converter has been designed to meet the IEC/EN 60068-2-3 standard, EN 50178
pkt. 9.4.2.2 at 50°C.

2.5. Aggressive Environments

A frequency converter contains a large number of mechanical and electronic components. All are
to some extent vulnerable to environmental effects.
CE labelling under the EMC directive either by using CE labelled components or by testing
the EMC of the system. If he chooses to use only CE labelled components, he does not
have to test the entire system.
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MG.11.B2.02 - VLT is a registered Danfoss trademark
2. Introduction to VLT HVAC Drive
Electrical In-
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