Hitachi WJ200 Series Quick Reference Manual page 100

7. Minimize the distance between an interference source and an interference sink
(interference- threatened device), thereby decreasing the effect of the emitted
interference on the interference sink.
 You should use only interference-free devices and maintain a minimum distance of
0.25 m from the adjustable frequency inverter.
8. Follow safety measures in the filter installation.
 If using external EMC filter, ensure that the ground terminal (PE) of the filter is
properly connected to the ground terminal of the adjustable frequency inverter. An
HF ground connection via metal contact between the housings of the filter and the
adjustable frequency inverter, or solely via cable shield, is not permitted as a
protective conductor connection. The filter must be solidly and permanently
connected with the ground potential so as to preclude the danger of electric shock
upon touching the filter if a fault occurs.
To achieve a protective ground connection for the filter:
 Ground the filter with a conductor of at least 10 mm
 Connect a second grounding conductor, using a separate grounding terminal
parallel to the protective conductor. (The cross section of each single protective
conductor terminal must be sized for the required nominal load.)
2
cross-sectional area.
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