Yaskawa Inverter Products Conform with the EMC Directive - Manual (Page 4)

Page 4 of 34
1. Introduction
This document has been compiled as auxiliary material for use by each manufacturer using YASKAWA
Inverters and described mainly countermeasures for EMC.
Therefore please refer to Instruction Manual also for installation and wiring.
We believe the Inverter that is installed according to this document and Instruction manual will meet following
standards.
Our inverter products have been tested by accredited laboratories with following norms:
Product norm: EN 61800-3:1996, EN61800-3, A11: 2001
Emission (radiated ) : EN50081-2 (1993)
EN55011 (1991) Class A Group 1
Emission ( conducted ) : EN50082-2 (1995)
EN55011 (1991) Class A or class B ( refer to attached tables )
2. Measures to make YASKAWA Inverters conform to EMC Directive
It is not necessary to mount YASKAWA inverters into a cabinet to keep the EMC limits.
Therefore it is not possible to provide detailed installation guidelines.
As a result we have to limit our instructions to a general guideline.
All electrical devices could have some different radiated emissions which could be
transmitted to other cables close by.
Similar to an antenna these cables send this disturbance to their environment.
If an electrical device ( i.e. an inverter ) is used without a proper filter
high or low frequency disturbance could be send to the mains.
General countermeasures are :
separate wiring of power and control units.
proper earthings
screening of power and control cables
To earth a high frequency disturbance with a low resistance a large area earthing is necessary.
We recommend to use earthing strips instead of normal cables. Furthermore the
screening of the cables must be earthed with proper earthing clamps.