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MDS-EX-CVP Series Specifications and Instruction Manual
13. Appx.3: EMC Installation Guidelines
13. Appx.3: EMC Installation Guidelines
13.1 Introduction
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] 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 tool builder. For measures for CNC,
refer to "EMC INSTALLATION GUIDELINES" of each NC Connection Manual.
13.2 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 in the table below. It is assumed that the Standards and test details required for a
machine tool are about the same as these.
Class
Radiated noise
Emission
Conductive noise
Static electricity electrical
discharge immunity test
Radiated radio-frequency
magnetic field immunity test
Electrical fast transient/burst
immunity test
Immunity to conducted
Immunity
disturbance induced by radio-
frequency magnetic field
Power supply frequency field
immunity test
Immunity test for voltage dip,
short-time power failure and
voltage fluctuation
Surge immunity test
13.3 EMC Measures
The main items relating to EMC measures include the following.
[1] Store the device in an electrically sealed metal panel.
[2] Earth all conductors that are floating electrically. (Lower the impedance.)
[3] Wire the power line separated from the signal wire as far as possible.
[4] Use shielded wires for the cables wired outside of the panel.
[5] Install a noise filter.
Ensure the following items to suppress noise radiated outside of the panel.
[1] Accurately ground the devices.
[2] Clamp shielded wires in the control panel.
[3] Increase the panel's electrical seal. Reduce the gap and hole size.
Note that the electromagnetic noise radiated in the air is greatly affected by the clearance of the panel and the quality
of the cable shield.
Name
Electromagnetic noise radiated through
the air
Electromagnetic noise discharged from
power line
(Example) Withstand level of discharge
of electricity charged in a human body.
(Example) Simulation of immunity from
digital wireless transmitters
(Example) Withstand level of noise from
relays or connecting/disconnecting live
wires
(Example) Withstand level of noise
entering through power line, etc.
(Example) 50/60Hz power frequency
noise
(Example) Power voltage drop withstand
level
(Example) Withstand level of noise
caused by lightning
Details
Generic Standard
EN61000-6-4
(General industrial
machine)
EN61800-3
(Motor control unit)
EN61000-6-2
(General industrial
machine)
EN61800-3
(Motor control unit)
53
Standards for
determining
test and
measurement
---
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-6
EN61000-4-8
EN61000-4-11
EN61000-4-5
IB-1501587-A
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