Air Humidity; Aggressive Environments; Vibration And Shock - Danfoss VLT AQUA Drive Design Manual

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VLT AQUA Drive Design Guide

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.
The frequency converter should not be installed in environments with airborne liquids, particles, or gases capable of affecting and
damaging the electronic components. Failure to take the necessary protective measures increases the risk of stoppages, thus reducing
the life of the frequency converter.
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 IP 54/55. As an extra
protection, coated printet circuit boards can be orded as an option.
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 very dusty environments, use equipment with enclosure rating IP 54/55 or a
cabinet for IP 00/IP 20/TYPE 1 equipment.
In environments with high temperatures and humidity, corrosive gases such as sulphur, nitrogen, and chlorine compounds will cause chemical processes
on the frequency converter components.
Such chemical reactions will rapidly affect and damage 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.
NB!
Mounting frequency converters in aggressive environments increases the risk of stoppages and considerably reduces the life of the
converter.
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 installation cabinets and existing electrical installations. One indicator of aggressive airborne gases is
blackening of copper rails and cable ends on existing installations.

2.6. Vibration and shock

The frequency converter has been tested according to the procedure based on the shown standards:
The frequency converter complies with requirements that exist for units mounted on the walls and floors of production premises, as well as in panels
bolted to walls or floors.
IEC/EN 60068-2-6:
IEC/EN 60068-2-64:
Vibration (sinusoidal) - 1970
Vibration, broad-band random
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MG.20.N4.02 - VLT is a registered Danfoss trademark
2. Introduction to VLT AQUA Drive
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