Aggressive Environments - Danfoss VLT AutomationDrive FC 300 Design Manual

Safety and Conformity

2.5 Aggressive Environments

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An adjustable frequency drive contains a large number of
mechanical and electronic components, many of which are
vulnerable to environmental effects.
CAUTION
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.
Degree of protection as per IEC 60529
To prevent cross faults and short circuits between
terminals, connectors, tracks, and safety-related circuitry
caused by foreign objects, the Safe Torque Off (STO)
function must be installed and operated in an IP54 or
higher rated control cabinet (or equivalent environment).
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 IP54/IP55 or a cabinet
for IP00/IP20/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.
Optional coated PCBs also offer protection in such
environments.
18
Design Guide
NOTICE!
Mounting adjustable frequency drives in aggressive
environments increases the risk of stoppages and consid-
erably 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 instal-
lation cabinets and existing electrical installations. One
indicator of aggressive airborne gases is blackening of
copper rails and cable ends.
D and E enclosures have a stainless steel backchannel
option to provide additional protection in corrosive
environments such as salt air found near sea side
applications. Proper ventilation is still required for the
internal components of the adjustable frequency drive.
Contact Danfoss for additional information.
2.5.1 Humidity
The adjustable frequency drive has been designed to meet
the IEC/EN 60068-2-3 standard, EN 50178 § 9.4.2.2 at
122 °F [50 °C].
2.5.2 Vibration
The adjustable frequency drive has been tested according
to the procedure based on the following standards:
The adjustable frequency drive 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.
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
•
IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970
•
IEC/EN 60068-2-64: Vibration, broad-band random
MG34S222