FC 300 Design Guide
Introduction to FC 300
The adjustable frequency drive should not be installed in environments with airborne
liquids,particles,orgasescapableofaffecting a nd damaging the e lectronic c omponents.
Failure to take the necessary p rotective measure s increases the risk of stoppages,
thus reducing the life of the adjustable frequency drive.
L
iquids can be carried through the air and condense in the adjustable frequency drive and may cause
corrosion of components and metal part s. 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 P
articles such as dust may cause mechanical, electrical, or the rmal failure in the adjustable
frequency drive. A typical indicator of excessive levels of airborne particles is dust particles a round
theadjustablefrequencydrivefan. Inverydusty environments, use equipment with encl
osure 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 processe s on the adjustable frequency drive components.
Such chemical reactions will rapidly affect and damage the electronic components. In
such environments, mount the eq uipment in a cabinet with fre sh a ir ven
tilation, keeping
aggressive gases away from the adjustable freque nc y drive.
An extra protection in such areas is a coating of the printed circuit boards, which can be ordered as an option.
NOTE
Mounting adjus table frequency drives in aggres sive envi
ronments increases the risk of
stoppages and considerably red uces the life of the drive.
Before installing the adjustable frequency drive, check the ambien t air for liquids, particles, and g ases.
This is done b y observing existing installations in this environment. Typical indicators of harmful
airborne liquids are water or oil on metal parts, or co
rrosion 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 e x isting installations.
" Vibration and Shock
The adjustabl e frequency drive has been
tested according to a procedu
re based on
the shown standards:
The adjustable frequency drive complies with
requirements that exist for units mounted on the
wallsandfloorsofproduc
tion premises, as well
as i n panels bolted to walls or floors.
IEC/EN 60068-2-6: Vibration (sinusoidal) - 1970
IEC/EN 60068-2-64: Vibration, broad-band
random
" Control Principle
An ad justable frequency drive rectifies AC voltage from line into DC voltage, after w hich this DC
voltage is converted into an AC current with a variable amplitude and frequency.
The motor is supplied with variable voltage / current and f re quency, which enables infinitely variable speed
control of three-phased, standard AC motors and permanent magnet synchronous motors.
18
MG.33.B3.22 - VLT is a registered Danfoss trademark
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