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Appendix 4. EMC Installation Guidelines
A4 - 2
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" (BNP-B2230).
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
Radiated noise Electromagnetic noise radiated through the air
Emission
Conductive noise Electromagnetic noise discharged from power line
EN61000-6-4
EN61800-3
(Industrial
environment)
EN55011
Static electricity
electrical discharge
Example) Withstand level of discharge of
electricity charged in a human body.
IEC61000-4-2
Radiated magnetic
field
Example) Simulation of immunity from digital
wireless transmitters
IEC61000-4-3
Burst immunity
Example) Withstand level of noise from relays or
connecting/disconnecting live wires
IEC61000-4-4
Conductive
immunity
Example) Withstand level of noise entering
through power line, etc.
IEC61000-4-6
Power supply
frequency field
Example) 50/60Hz power frequency noise
IEC61000-4-8
Power dip
(fluctuation)
Example) Power voltage drop withstand level
IEC61000-4-11
Immunity
Surge
Example) Withstand level of noise caused by
lightning
EN61000-6-2
EN61800-3
(Industrial
environment)
IEC61000-4-5