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Appendix 4. EMC Installation Guidelines
A4 - 4
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).
EMI gasket
Packing
Carry out conductance treatment on
sections that the EMI gasket contacts.
Door
Control panel
[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.
Drive unit
Power
line filter
Breaker
Control panel
A
C input
Radiated
noise
Shielding
plate
Control panel
Power
line filter
Breaker
A
C input
Radiated
noise
Drive unit
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.