Potentially Explosive Atmospheres; Installation Requirements - Danfoss D9h Operating Manual

VLT® AutomationDrive FC 302
Operating Guide

4.5.4 Potentially Explosive Atmospheres

EXPLOSIVE ATMOSPHERE
Installing the drive in a potentially explosive atmosphere can lead to death, personal injury, or property damage.
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Install the unit in a cabinet outside of the potentially explosive area.
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Use a motor with an appropriate ATEX protection class.
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Install a PTC temperature sensor to monitor the motor temperature.
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Install short motor cables.
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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 fol-
lowing 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
need an individual approval from an approbated organization.
Motors with class d/e protection
The motor itself has an e ignition protection class, while the motor cabling and connection environment are in compliance with the
d classification. To attenuate the high peak voltage, use a sine-wave filter at the drive output.
MOTOR THERMISTOR SENSOR MONITORING
Units with the VLT® PTC Thermistor Card MCB 112 option are PTB-certified for potentially explosive atmospheres.

4.6 Installation Requirements

OVERHEATING
Improper mounting can result in overheating and reduced performance.
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Install the drive according to the installation and cooling requirements.
• Locate the unit as near to the motor as possible. For the maximum motor cable length, see
• Ensure unit stability by mounting the unit to a solid surface.
• Ensure that the strength of the mounting location supports the unit weight.
• Ensure that there is enough space around the unit for proper cooling. Refer to
• Ensure enough access to open the door.
• Ensure cable entry from the bottom.
Danfoss A/S © 2021.10
W A R N I N G
PTC Thermistor Card MCB 112, installation does not
®
N O T I C E
N O T I C E
Mechanical Installation
10.5 Motor and Control
10.10 Enclosure Airflow.
AQ262139143212en-000301 / 130R0879 | 41
Cables.