User Guide

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. NOTE: An external EMC filter is
usually required to fulfil the EMC emission requirements.
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 ground, or connected to ground 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 H or L to T
The EMC protection class of SmartVFD Compact frequency converters can be
changed from class H or L to class T by removing the EMC-capacitor disconnect-
ing screw, see figure below.
Note! Do not attempt to change the EMC level back to class H or L. Even if the pro-
cedure above is reversed, the frequency converter will no longer fulfil the EMC re-
quirements of class H/L!