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11. Requirement for the compliance with EMC Directives
EMC Directives prescribe both “Emission (electromagnetic interference): Do not radiate strong electromagnetic waves outside”
and “Immunity (electromagnetic susceptibility): Do not be influenced by electromagnetic waves from outside”.
This section compiles the precautions for the compliance of the system incorporating the energy measuring unit (target model:
EMU4-FD1-MB) with the EMC Directives. The following description is based on the requirement of the regulations and the standards
we understand, but we do not guarantee to comply with the directives above for the whole system built in accordance with this
description. The manufacturer of the system finally needs to evaluate the way of the compliance with EMC Directives and whether
the system complies with them or not.
(1) Harmonized standard for EMC Directives: EN61326-1:2013
(a) Compatibility condition for harmonized standard
The energy measuring unit
is the open type device (i.e. the device incorporated in other device), and needs to be
installed in the conductive control panel. The unit
is tested with installed in the control panel for the emission and the
immunity out of the test items for the standard.
(2)
Recommended condition for installation in the control panel
(a) Control panel
・
Control panel needs to have conducting property.
・
When bolting the top panel, bottom panel etc. of the control panel, mask the grounding part of the panel so as not to be
painted.
・
In inner panel, keep the conductivity in as large area as possible by masking the bolting part to the main panel to keep the
electric contact to main panel.
・
Ground the main panel by the thick wire so as to keep high impedance even for high-frequency wave.
(b) Installation of power line and ground line
・
Set up the ground point to the control panel near the energy measuring unit, and ground the frame GND terminal of the
unit
to the ground terminal of the control panel (PE) by as thick and short wires as possible. (wire length is 30cm or
shorter)