3 - 3
(4)
Weld
or screw the main board, side boards and such without leaving space. The
space between each connecting section (welding section or screws) should be less
than 10cm. If the space exists between boards, the shielding effect may be lost. The
dimension of holes in the enclosure, such as ventilation holes, should be less than
10cm. Holes larger than that should be covered with metal board or punching metal.
When using these material, ensure not to loose the electric connection by using
anti-conductive metal or material. One faulty example of this is a connection
between painted areas.
enclosure
Metal board or
punching metal
Mask the painting
* The connection should be
conductive. Connection
between painted area is invalid.
(5) Use a thick short wire to connect the earth terminal of the control device to the earth
terminal of the enclosure.
(6) Use a thick short wire to ground (earth) the enclosure.
(7) Using separate enclosures for the driving device including an inverter and for the
signal controlling device provide more effective EMC measure.
