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2.4.4 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.
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 the section
EMC Immunity
.
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].
2.5.1 Aggressive Environments
An adjustable frequency drive contains a large number of mechanical and electronic components. All are to some extent vulnerable to environmental
effects.
The adjustable frequency drive 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 adjustable frequency drive.
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 54/55. As an extra
protection, coated printed 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 54/55 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 reactions on
the adjustable frequency drive 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 adjustable frequency drive.
An extra protection in such areas is a coating of the printed circuit boards, which can be ordered as an option.
NOTE!
Mounting adjustable frequency drives in aggressive environments increases the risk of stoppages and considerably reduces the life of
the drive.
Before installing the adjustable frequency drive, 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
the blackening of copper rails and cable ends on existing installations.
NOTE!
D and E enclosures have a stainless steel back-channel option to provide additional protection in aggressive environments. Proper ventilation is still
required for the internal components of the drive. Contact Danfoss for additional information.
FC 300 Design Guide
2 Safety and Conformity
MG.33.BC.22 - VLT
®
is a registered Danfoss trademark
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