4.3.2 Gases
Aggressive gases, such as hydrogen sulphide, chlorine, or ammonia can damage the electrical and mechanical components. The unit
uses conformal-coated circuit boards to reduce the effects of aggressive gases.
For conformal coating class specifications and ratings, see the Ambient Conditions section.
4.3.3 Dust
When installing the unit in a dusty environment, keep the following free from dust buildup:
• Electronic components.
• Heat sink.
• Fans.
Keep the heat sink and fans free from dust buildup. When dust accumulates on electronic components, it acts as a layer of insulation.
This layer reduces the cooling capacity of the components, and the components become warmer. The hotter environment decreases
the life of the electronic components. Dust can also accumulate on fan blades, causing an imbalance which prevents the fan from
properly cooling the unit. Dust buildup can also damage fan bearings and cause premature fan failure.
For more information, refer to the Maintenance and Service section.
4.3.4 Potentially Explosive Atmospheres
WARNING
EXPLOSIVE ATMOSPHERE
Installing the drive in a potentially explosive atmosphere can lead to death, personal injury, or property damage.
-
Install the unit in a cabinet outside of the potentially explosive area.
-
Use a motor with an appropriate ATEX protection class.
-
Install a PTC temperature sensor to monitor the motor temperature.
-
Install short motor cables.
-
Use sine-wave output filters when shielded motor cables are not used.
As required by the EU Directive 2014/34/EU, any electrical or electronic device intended for use in an environment with a potentially
explosive mixture of air, flammable gas, or dust must be ATEX-certified. Systems operated in this environment must fulfill the following
special conditions to comply with the ATEX protection class:
• Class d specifies that if a spark occurs, it is contained in a protected area.
• Class e prohibits any occurrence of a spark.
Motors with class d protection
Does not require approval. Special wiring and containment are required.
Motors with class e or class n protection
When combined with an ATEX-approved PTC monitoring device like the VLT
®
PTC Thermistor Card MCB 112, installation does not need
an individual approval from an approbated organization.
Mechanical Installation
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707| 23
Danfoss A/S © 2020.01
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