Installation Site Check; Harsh Environments; Airborne Liquids; Airborne Solids - Danfoss VLT FC Series Operating Instructions Manual

Pre-Installation
4. Check motor wiring:
•
Any disconnect between drive and
motor should be interlocked to drive
safety interlock circuit to avoid
unwanted drive trips.
•
Do not connect power factor correction
capacitors between drive and motor.
•
Two speed motors must be wired
permanently for full speed.
•
Y-start, Δ-run motors must be wired
permanently for run.

2.1.3 Installation Site Check

•
Because the panel relies on the ambient air for
cooling, it is important to observe the limitations
on ambient air temperature. Derating concerns
start above 104 °F (40 °C) and 3300 feet (1000 m)
elevation above sea level.
•
It is important with multiple panels to check wall
strength. Make sure that the proper mounting
screws or bolts are used.
•
Ensure that the wall or floor area for installation
will support the weight of the unit.
•
If construction work continues after the
equipment is mounted, it is important to keep
the interior free from concrete dust and similar
dirt. If the unit does not have power applied to it,
supply a protective covering. It is important to
ensure that the components stay as clean as
possible. It may be necessary to clean the interior
once construction is completed.
•
Keep drawings and manuals accessible for
detailed installation and operation instructions. It
is important that the manuals are available for
equipment operators.

2.2 Harsh Environments

The mechanical and electrical components within the
panel can be adversely affected by the environment. The
effects of contaminants in the air, either solid, liquid, or
gas, are difficult to quantify and control.

2.2.1 Airborne Liquids

Liquids in the air can condense in components. Water
carried in the air is easily measured as relative humidity,
but other vapors are often more difficult to measure or
control. Steam, oil and salt water vapor may cause
corrosion of components. In such environments, use TYPE
12 enclosures to limit the exchange of outside air into the
option enclosure. Extremely harsh environments may
require a higher level of protection.
Option Panel Operating Instructions

2.2.2 Airborne Solids

Particles in the air may cause mechanical, electrical or
thermal failure in components. A NEMA 1 enclosure
provides a reasonable degree of protection against falling
particles, but it will not prevent the fan from pulling dirty
air into the enclosure. A typical indicator of excessive levels
of airborne particles is dust around the fan. In dusty
environments, use NEMA 12 enclosures.

2.2.3 Corrosive Chemicals

In environments with high temperatures and humidity,
corrosive gases such as sulfur, nitrogen and chlorine
compounds cause corrosion to occur in components.
Indications of corrosion are blackened copper or rust on
steel or oxidized aluminum. In such environments, it is
recommended to mount the equipment in a cabinet with
fresh air ventilation and to keep corrosive compounds
away. A non-ventilated cabinet fitted with an air
conditioner as a heat exchanger may be used. Conformal
coated circuit boards may be specified to reduce the
corrosive effects of a harsh environment.
®
MG14I102 - VLT is a registered Danfoss trademark
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