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Appendix 4 - 4
Appendix 4 EMC Installation Guidelines
MITSUBISHI CNC
Appendix 4-4-2 Measures for door
[1] Use metal for all materials configuring the door.
[2] Use an EMI gasket or conductive packing for the contact between the door and control panel unit.
[3] The EMI gasket or conductive packing must contact at a uniform and correct position of the metal
surface of the control panel unit.
[4] The surface of the control panel unit contacted with the EMI gasket or conductive packing must have
conductance treatment.
(Example) Weld (or screw) a plate that is plated (with nickel, tin).
[5] As a method other than the above, the control panel unit and door can be connected with a plain
braided wire. In this case, the panel and door should be contacted at as many points as possible.
Appendix 4-4-3 Measures for operation board panel
[1] Always connect the operation board and indicator with an earthing wire.
[2] If the operation board panel has a door, use an EMI gasket or conductive packing between the door and
panel to provide electrical conductance in the same manner as the control panel.
[3] Connect the operation board panel and control panel with a sufficiently thick and short earthing wire.
Appendix 4-4-4 Shielding of the power supply input section
[1] Separate the input power supply section from other parts in the control panel so that the input power
supply cable will not be contaminated by radiated noise.
[2] Do not lead the power line through the panel without passing it through a filter.
EMI gasket
Packing
Control panel
Door
Carry out conductance treatment on
sections that the EMI gasket contacts.
Control panel
Control panel
Drive unit
Drive unit
Radiated
noise
Radiated
noise
AC input AC input
Breaker
Breaker
Power
line filter
Power
line filter
Shielding
plate
The power supply line noise is eliminated
by the filter, but cable contains noise
again because of the noise radiated in the
control panel.
Use a metal plate, etc., for the shielding
partition. Make sure not to create a
clearance.