4.5.2 Gases within the Operating Environment
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.
4.5.3 Dust within the Operating Environment
When installing the drive in dusty environments, keep the following free from dust buildup:
• Electronic components.
• Heat sink.
• Fans.
Periodic maintenance
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.
4.5.4 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 ATEX protection class d or class e.
• Class d (if a spark occurs, it is contained in a protected area).
• Class e (prohibits any occurrence of a spark).
-
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 94/9/EC, 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:
Motors with class d protection
Does not require approval. Special wiring and containment are required.
Motors with class e 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® AQUA Drive FC 202
AQ262141056213en-000101 / 130R0882 | 33
Danfoss A/S © 2018.10
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