Honeywell
Installation
17
4
Category C4:
The drives of this class do not provide EMC emission protection.
These kinds of drives are mounted in enclosures.
Category C4 for IT networks:
Frequency converters of this class fulfil the product
standard EN 61800-3 (2004) if intended to be used in IT systems. In IT systems, the
networks are isolated from earth, or connected to earth through high impedance to
achieve a low leakage current. NOTE: if converters are used with other supplies, no
EMC requirements are complied with.
Environments in product standard EN 61800-3 (2004)
First environment:
Environment that includes domestic premises. It also includes
establishments directly connected without intermediate transformers to a low-voltage
power supply network which supplies buildings used for domestic purposes.
NOTE:
houses, apartments, commercial premises or offices in a residential building
are examples of first environment locations.
Second environment:
Environment that includes all establishments other than
those directly connected to a low-voltage power supply network which supplies build-
ings used for domestic purposes.
NOTE: industrial areas, technical areas of any building fed from a dedicated trans-
former are examples of second environment locations.
4.1.4 Changing the EMC protection class from C2 or C3 to C4 for IT net-
works
The EMC protection class of SmartVFD COMPACT frequency converters can be
changed from class C2 or C3 to class C4 for IT networks by
removing the EMC-
capacitor disconnecting screw
, see figure below.
Note!
Do not attempt to change the EMC level back to class C2 or C3. Even if the
procedure above is reversed, the frequency converter will no longer fulfil the EMC
requirements of class C2/C3!!
