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Chapter 7 Optional Accessories CFP2000
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 use manual:
EN61000-6-4
EN61800-3
EN55011 Class A Group 1
General precaution
To ensure EMC filter can maximize the effect of suppressing the interference of AC motor drive, the
installation and wiring of A motor drive should follow the user manual. In addition, be sure to observe the
following precautions:
All the cables should be divided into several classifications, and kept away from each other. The
metal layer inside the control cabinet can separate the cables as well. For susceptible cables (Class
1), there should always be an uninterrupted partition between the two terminals. Use the following
classifications (Class 1–4):
•
Class 1: Cables susceptible to interference (e.g. low-voltage / high-speed signal cable, control
cable, data cable...)
•
Class 2: Cables susceptible to interference (e.g. low-speed communication cable, low-voltage
(24 V) power cable...)
•
Class 3: Disturbance cable (e.g. R.S.T. power input cable)
•
Class 4: Strong disturbance cable. (e.g. U.V.W. motor output cable)
•
The following figure shows the recommended cables and their installation clearance:
Class 1
If the installation distance does not meet the above separation requirement, connect a zero-phase
reactor to the Class 4 cable in series, and use shielded cable or connect core in series to the Class 1
cable.
When the installation distances of different cables do not meet the separation requirement, place the
cables at right angles. For example, the filtered cable should be separated from the non-filtered
cable; signal cable, data cable and filtered cable can only be placed at right angles with the
non-filtered cable.
Class 2
>5cm
>20cm
>25cm
Class 3
>20cm
>45cm
>40cm
7-30
Class 4
Figure 7-30
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