Chapter 7 Optional Accessories|CFP2000 Series
7-13
EMC Filter Installation
All electrical equipment, including AC motor drives, will generate high-frequency/low-frequency noise
and will interfere with peripheral equipment by radiation or conduction when in operation. By using an EMC
filter with correct installation, much interference can be eliminated. It is recommended to use DELTA EMC
filter to have the best interference elimination performance.
We assure that it can comply with following rules when AC motor drive and EMC filter are installed and
wired according to user manual:
EN61000-6-4
EN61800-3: 1996
EN55011 (1991) Class A Group 1 (1
st
Environment, restricted distribution)
General precaution
1. EMC filter and AC motor drive should be installed on the same metal plate.
2. Please install AC motor drive on footprint EMC filter or install EMC filter as close as possible to the AC
motor drive.
3. Please wire as short as possible.
4. Metal plate should be grounded.
5. The cover of EMC filter and AC motor drive or grounding should be fixed on the metal plate and the
contact area should be as large as possible.
Choose suitable motor cable and precautions
It is recommended to use isolated motor wires, as well as the signal wires and data wires.
The recommended specification of the shielding wire can be selected from the three types of shielding wire
in Figure 1. (The left figure is a symmetric three-phase power cord with symmetric PE wires.
The middle figure is a three-phased power cord with a separated PE wire. The right figure is the
asymmetric three-phase power cord with a PE wire. )
The appropriate size of the power cord should be based on the rated current. Use of high density braided
shielding prevents electromagnetic noise that results from high frequency signals, as well as prevents
external sources from interfering with signal transmissions. Therefore we recommend two types shielded
cables:
z Braided copper shielding of 85% density or more (as shown in diagram 2a)
z 100% Wrapped in aluminum foil/ copper foil inside and in braided shielding of 80% or more outside
(as shown in diagram 2b)
T1
T2 T3
PE
PEPE
T2 T3
PE
T1
T1
T2
T3
PE
Figure 1
Types shielded cables recommended
Figure 2a
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