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FCD 300 and ATEX
The following variants of the FCD 300 can be installed directly in Group II, Category 3, and Zone 22 areas:
VLT Decentral FCD3xx-P-T4-P66-xx-R1-Dx-Fxx-T11-Cx
VLT Decentral FCD3xx-P-T4-P66-xx-R1-Dx-Fxx-T12-Cx
VLT Decentral FCD3xx-P-T4-P66-xx-R1-Dx-Fxx-T51-Cx
VLT Decentral FCD3xx-P-T4-P66-xx-R1-Dx-Fxx-T52-Cx
Group II, Category 3, and Zone 22 areas are characterised by:
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Surface installations
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Explosive atmosphere is unlikely to occur or, if it does, is likely to only be of short duration and not in normal duty
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The explosive media is dust
The maximum surface temperature of the FCD 300 during worst-case normal duty is limited to 135°C. This temperature must be lower than the ignition
temperature of the present dust.
The installer must define the zone, category and dust ignition temperature of the environment where the FCD 300 is installed.
ATEX correct installation
The following issues must be taken into account when installing the FCD 300 in ATEX zone 22 environments:
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Motor must be designed, tested and certified by the motor manufacturer for variable speed application
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Motor must be designed for Zone 22 operation. I.e. with type of protection “tD“ acc. to EN61241-0 and -1 or EN50281-1-1.
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Motor must be provided with thermistor protection. The thermistor protection must either be connected to an external thermistor relay, with EC
Type Examination Certificate or compatible with the FCD 300 thermistor input.
If the FCD 300 thermistor protection is used, the thermistor must be wired to terminals 31a and 31b, and thermistor trip activated by programming
parameter 128 to thermistor trip [2]. See parameter 128 for further details.
•
Cable entries must be chosen for the enclosure protection to be maintained. It must also be ensured that the cable entries comply with the
requirements for clamping force and mechanical strengths as described in EN 50014:2000.
•
The FCD must be installed with appropriate earth connecting according to local/national regulations.
•
The installation, inspection and maintenance of electrical apparatus for use in combustible dusts, must only be carried out by personnel that is
trained and familiar with the concept of protection.
For a declaration of conformity, please consult your local Danfoss representative.
2 Introduction to FCD 300
VLT
®
Decentral FCD 300 Design Guide
36
MG.90.S1.02 - VLT
®
is a registered Danfoss trademark
2