Air Humidity; Aggressive Environments - Danfoss VLT Compressor Drive CDS 803 Design Manual

Product Overview
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, Danfoss
guarantees 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 if the
instructions for EMC-correct installation 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 instal-
lation to ensure EMC-correct installation. Furthermore,
Danfoss specifies which our different products comply
with.
Danfoss provides other types of assistance that can help to
obtain the best EMC result.
2.2.4 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.
Note 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 instal-
lation guidelines for the power drive system. If the EMC-
correct instructions for installation are followed, the
standards and test levels stated for power drive systems
are complied with.

2.3 Air Humidity

The frequency converter has been designed to meet the
IEC/EN 60068-2-3 standard, EN 50178 9.4.2.2 at 50 °C
(122 °F).

2.4 Aggressive Environments

A frequency converter contains many mechanical and
electronic components. All are to some extent vulnerable
to environmental effects.
MG18N202
Design Guide
CAUTION
Do not install the frequency converter in environments
with airborne liquids, particles, or gases that may affect
or damage the electronic components. Failure to take
necessary protective measures increases the risk of
stoppages, potentially causing equipment damage and
personnel injury.
Liquids can be carried through the air and condense in the
frequency converter and may cause corrosion of
components and metal parts. Steam, oil, and salt water
may cause corrosion of components and metal parts. In
such environments, use equipment with enclosure rating
IP54. As an extra protection, coated printed circuit boards
can be ordered as an option (standard on some power
sizes).
Airborne particles such as dust may cause mechanical,
electrical, or thermal failure in the frequency converter. A
typical indicator of excessive levels of airborne particles is
dust particles around the frequency converter fan. In dusty
environments, use equipment with enclosure rating IP54 or
a cabinet for IP20/TYPE 1 equipment.
In environments with high temperatures and humidity,
corrosive gases such as sulphur, nitrogen, and chlorine
compounds causes chemical processes on the frequency
converter components.
Such chemical reactions rapidly affect and damages the
electronic components. In such environments, mount the
equipment in a cabinet with fresh air ventilation, keeping
aggressive gases away from the frequency converter.
An extra protection in such areas is a coating of the
printed circuit boards, which can be ordered as an option.
Before installing the frequency converter, check the
ambient air for liquids, particles, and gases. This is done by
observing existing installations in this environment. Typical
indicators of harmful airborne liquids are water or oil on
metal parts, or corrosion of metal parts.
Excessive dust particle levels are often found on instal-
lation cabinets and existing electrical installations. One
indicator of aggressive airborne gases is blackening of
copper rails and cable ends on existing installations.
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