The frequency converter should not be installed in environments with airborne liq-
uids, 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 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 com-
ponents and metal parts. In such environments, use equipment with enclosure rating IP 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 fre-
quency 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 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 envi-
ronments, 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 in-
stallations. 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 a 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:
Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64:
Vibration, broad-band random
2. Introduction to VLT HVAC Drive
VLT
®
HVAC Drive Design Guide
16
MG.11.B2.02 - VLT
®
is a registered Danfoss trademark
2
Содержание VLT series
Страница 78: ...4 How to Order VLT HVAC Drive Design Guide 78 MG 11 B2 02 VLT is a registered Danfoss trademark 4...
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