Instruction manual

Appendix 7. EMC Installation Guidelines
A7 - 4
Appendix 7-4-2 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 7-4-3 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.
Refer to the "EMC INSTALLATION GUIDELINES" BNP-B2230 for the NC for more details.
Appendix 7-4-4 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.
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.
Drive unit
Power
line filter
Breaker
Control panel
A
C input
Radiated
noise
Drive unit
Power
line filter
Breaker
Control panel
A
C input
Radiated
noise
Shielding
plate