Danfoss VLT DMS 300 Manual page 68

®
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:
• Surface installations
• Explosive atmosphere is unlikely to occur or,
if it does, is likely to only be of short duration
and not in normal duty
• The explosive media is dust
The maximum surface temperature of the FCD 300
during worst-case normal duty is limited to 275ºF
(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:
• Motor must be designed, tested and certified by the
motor manufacturer for variable speed application
• 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.
• 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 ground
connecting according to local/national regulations.
• The installation, inspection and maintenance of
electrical apparatus for use in combustible dust,
68
Decentral Solutions
must only be carried out by personnel that are
trained and familiar with the concept of protection.
For a declaration of conformity, please consult
your local Danfoss representative.
MG.90.F2.22 - VLT is a registered Danfoss trademark