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12. Requirements for Compliance with EMC Directive
The EMC Directive specifies both
‘Emission (electromagnetic interference), requiring that products do not emit strong
electromagnetic waves
to the outside’ and ‘Immunity (electromagnetic susceptibility), requiring that products are not affected by
electromagnetic waves from the outside
.’
This section summarizes the precautions to have a system constructed with Energy Measuring Unit (applicable model: EMU4-
BM1-MB and EMU4-HM1-MB) comply with the EMC Directive.
The following description is based on the regulatory requirements and standards that we understand. However, it shall not be
guaranteed that the whole system constructed in accordance with the description here complies with the EMC Directive.
The manner to comply with the EMC Directive or assessment of the compliance must be determined by the system manufacturer
itself finally.
（
1
）
Harmonized standards for EMC Directive: EN61326-1: 2013
（
a
）
Conditions to comply with the harmonized standards
Energy Measuring Unit is an open type device, which is incorporated into other system, and must be installed inside a
conductive control panel.
In the test items involved, the radiated emission and immunity tests have been performed with the unit installed into
the control panel.
（
2
）
Recommended conditions for installing into the control panel
（
a
）
Control panel
Use a conductive control panel.
When bolting the top or bottom plate to the control panel, mask the grounding part of the control panel so as not
to be painted.
Secure the conductivity on the inner plate surface in the control panel as large as possible by taking measures
such as masking the bolting part installed to the unit so that the inner plate is able to ensure electrical contact
with the control panel itself.
Ground the control panel itself with a thick ground wire to keep low impedance even at high frequencies.
（
b
）
Installation of power line and ground line
Provide a grounding point to the control panel near Energy Measuring Unit, and ground the frame GND terminal
of the unit and the ground (PE) terminal of the control panel with a ground wire as thick and short as possible.
The wire length is 30 centimeters or less.
（
3
）
Cable
（
a
）
For Auxiliary power, voltage input, CC-Link communication, MODBUS communication, and small type display unit
When it is required to comply with the EMC Directive (EN-61326-1), install a ferrite core on each connection cable.
The ferrite cores used when we have performed the test are as follows:
Auxiliary power
KITAGAWA INDUSTRIES CO., LTD., RFC-H13
KITAGAWA INDUSTRIES CO., LTD., TRM-31-20-15E-WE
Voltage input
KITAGAWA INDUSTRIES CO., LTD., RFC-H13
CC-Link communication line, MODBUS communication line
KITAGAWA INDUSTRIES CO., LTD., RFC-20
Small type display unit
KITAGAWA INDUSTRIES CO., LTD., RFC-H13
（
b
）
For external input signal line and external output signal line
Observe the following conditions for each wiring line:
For wiring inside buildings, the wiring length must not exceed 30 meters.
Do not perform the wiring from inside the building to outside the building.
