2 Engineering
2.6 Radio inter ference suppression filter
DC1 Variable Frequency Drive 04/16 MN04020003Z-EN www.eaton.com 43
2.6 Radio interference suppression filter
DC1-12xxxF…, DC1-32xxxF…, and DC1-34xxxF… variable frequency drives
feature an internal radio interference suppression filter. When combined with
a motor cable that is screened and earthed 360° on both ends, they make it
possible to comply with the stringent EMC limits for conducted interference
corresponding to category C1 in the 1st environment (IEC/EN 61800-3).
This requires installation in accordance with EMC requirements, as well as
not exceeding permissible motor cable lengths.
• 1 m for category C1 in the 1st environment (only DC1-12…),
• 5 m for category C2 in the 1st and 2nd environment,
• 25 m for category C3 in the 2nd environment.
Longer motor cable lengths can be used if additional external radio
interference suppression filters (DX-EMC…) are used.
Additional measures used to reduce EMC limits and use longer motor cable
lengths are possible in combination with motor chokes and sine filters.
￫
DC1-32… and DC1-34… three-phase variable frequency drives
can be operated within category C1 in the 1st environment only
if an external radio interference suppression filter is used.
￫
For the rated radio interference suppression filters for DC1
variable frequency drives, please refer to Section 2.6, “Radio
interference suppression filter“, page 43.
￫
The unscreened cable length between the radio interference
suppression filter and the variable frequency drive should not
exceed 300 mm (maximum of 500 mm depending on the setup
inside the metal-enclosed control panel).
￫
In the case of power drive systems (PDS) with variable
frequency drives, electromagnetic compatibility (EMC)
measures must already be taken into account during the
engineering stage, as making changes during assembly and
installation and retroactively fixing things will be more
expensive.
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