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Appendix 4 - 2
Appendix 4 EMC Installation Guidelines
MITSUBISHI CNC
Appendix 4-1 Introduction
EMC Instructions became mandatory as of January 1, 1996. The subject products must have a CE mark
attached indicating that the product complies with the Instructions.
As the NC unit is a component designed to control machine tools, it is believed to be out of the direct EMC
Instruction subject. However, we would like to introduce the following measure plans to backup EMC Instruction
compliance of the machine tool as the NC unit is a major component of the machine tools.
[1] Methods for installation in control/operation panel
[2] Methods of wiring cable outside of panel
[3] Introduction of countermeasure parts
Mitsubishi is carrying out tests to confirm the compliance to the EMC Standards under the environment described
in this manual. However, the level of the noise will differ according to the equipment type and layout, control
panel structure and wiring lead-in, etc. Thus, we ask that the final noise level be confirmed by the machine
manufacturer.
For measures for CNC, refer to "EMC INSTALLATION GUIDELINES" of each NC Connection Manual.
Appendix 4-2 EMC instructions
The EMC Instructions regulate mainly the following two withstand levels.
Emission ..... Capacity to prevent output of obstructive noise that adversely affects external sources.
Immunity ..... Capacity not to malfunction due to obstructive noise from external sources.
The details of each level are classified as Table 1. It is assumed that the Standards and test details required for a
machine are about the same as these.
Table 1
Class Name Details
Generic
Standard
Standards for
determining test
and measurement
Emission
Radiated noise Electromagnetic noise radiated through the air EN61000-6-4
EN61800-3
(Industrial
environment)
-----
Conductive noise
Electromagnetic noise discharged from power
line
Immunity
Static electricity electrical
discharge immunity test
(Example) Withstand level of discharge of elec-
tricity charged in a human body.
EN61000-6-2
EN61800-3
(Industrial
environment)
EN61000-4-2
Radiated radio-frequency magnetic
field immunity test
(Example) Simulation of immunity from digital
wireless transmitters
EN61000-4-3
Electrical fast transient/burst
immunity test
(Example) Withstand level of noise from relays
or connecting/disconnecting live wires
EN61000-4-4
Immunity to conducted disturbance
induced by radio-frequency mag-
netic field
(Example) Withstand level of noise entering
through power line, etc.
EN61000-4-6
Power supply frequency field
immunity test
(Example) 50/60Hz power frequency noise EN61000-4-8
Immunity test for voltage dip, short-
time power failure and voltage fluc-
tuation
(Example) Power voltage drop withstand level EN61000-4-11
Surge immunity test
(Example) Withstand level of noise caused by
lightning
EN61000-4-5