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

VLT ® AQUA Drive Design Guide
2.3.4. Compliance with EMC Directive 89/336/EEC
As mentioned, the adjustable frequency drive 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. To assist 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 the section
Electrical Installation

2.4. Air humidity

The adjustable frequency drive has been designed to meet the IEC/EN 60068-2-3 standard, EN
50178 pkt. 9.4.2.2 at 122° F [50° C].

2.5. Aggressive Environments

An adjustable frequency drive contains a large number of mechanical and electronic components.
All are vulnerable to environmental effects to some extent.
Liquids can be carried through the air and condense in the adjustable frequency drive 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
55. As an extra protection, coated printet circuit boards can be ordered as an option.
Airborne particles such as dust may cause mechanical, electrical or thermal failure in the adjustable
frequency drive. A typical indicator of excessive levels of airborne particles is the presence of dust
particles around the adjustable frequency drive fan. In very dusty environments, use equipment
with enclosure rating IP 55 or a cabinet for IP 00/IP 20/TYPE 1 equipment.
In environments with high temperatures and humidity, corrosive gases such as sulfur, nitrogen
and chlorine compounds will cause chemical processes on the adjustable frequency drive com-
ponents.
Such chemical reactions will rapidly affect and damage the electronic components. In such envi-
ronments, mount the equipment in a cabinet with fresh air ventilation, keeping aggressive gases
away from the adjustable frequency drive.
An extra protection in such areas is a coating of the printed circuit boards, which can be ordered
as an option.
.
The adjustable frequency drive should not be installed in environments with airborne
liquids, particles or gases capable of affecting and damaging the electronic compo-
nents. Failure to take the necessary protective measures increases the risk of
stoppages, thus reducing the life of the adjustable frequency drive.
MG.20.N2.22 - VLT ® is a registered Danfoss trademark.
2. Introduction to the VLT AQUA Drive
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