Vibration And Shock; Control Principle - Danfoss VLT AutomationDrive FC 300 Design Manual

FC 300 Design Guide
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 55 (NEMA 12). 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 dust particles around
the adjustable frequency drive fan. In very dusty environments, use equipment with enclosure rating
IP 55 (NEMA 12) or a cabinet for IP 00/IP 20/TYPE 1 (NEMA 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 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 blackening of copper rails and cable ends on existing installations.

Vibration and Shock

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The adjustable frequency drive has been
tested according to a procedure based on
the shown 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.

Control Principle

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An adjustable frequency drive rectifies AC voltage from line into DC voltage, after which this DC
voltage is converted into an AC current with a variable amplitude and frequency.
The motor is supplied with variable voltage / current and frequency, which enables infinitely variable speed
control of three-phased, standard AC motors and permanent magnet synchronous motors.
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Introduction to FC 300
MG.33.B3.22 - VLT is a registered Danfoss trademark
IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64: Vibration, broad-band
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