Emc Filters; Emc Compliant Installation Of Drive Systems; Selection Of Line Filter To Reduce Line-Conducted Interference - Omron 3G3RX User Manual

2-2 Wiring

EMC Filters

Warnings and Instructions
•The 3G3RX frequency inverters meet the limits of EN61800-3, C1/C2/C3, for radiated interference,
if the specified line filter is used and installation is performed according to our instructions, and
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internal line filter is disabled.
•The motor cable should be kept as short as possible in order to avoid electromagnetic emission as
well as capacitive currents. The quick voltage changes of the OMRON inverter series cause
capacitive currents through the motor cable stray capacitances.
The cable length increases the capacitive current and electromagnetic emission.
It is recommended that the motor cable length does not exceed 50m in any case, also depending
on the inverter power range.
It is recommended to install output AC-Reactors (motor chokes) if the cable length exceeds 50m.
•The EMC filters contain capacitors between the phases and the phases to ground as well as
discharging resistors. After switching off the line voltage you should wait a minimum of 60 seconds
before removing protective covers or touching terminals to avoid electric shock!
•The protective conductor connection between filter and drive is recommended without
interruptions such as plug or contactors. If power plug or contactor become necessary they should
be of the highest quality to provide neligible losses.
•The use of ground fault monitoring devices is not recommended. Should they be compulsory in
certain applications for safety reasons, you should choose monitoring devices which are suited for
DC-, AC- and HF- ground currents. Standard ground monitoring devices may fail due to the
switching nature of the inverter control.
•The line filters have been developed for use in grounded systems.
Use in ungrounded systems is not recommended.
If installed according to the following directions indicated in this section, the frequency inverter
comply with the following standards:
Emissions: EN 61800-3 (EN 55011 group 1, Category C1/C2/C3 [Class B/A])
Immunity: EN61800-3, industrial environments
EMC compliant Installation of Drive Systems
Introduction
This document describes the electromagnetically compatible setup of your drive system with
OMRON 3G3RX series inverters. (Electro Magnetic Compatibility = EMC). Read this information
carefully and follow the instructions. If necessary, provide this information to third parties.
HF interference results from rapid switching of electric currents and voltages. All AC, DC and servo
drives very rapidly switch large currents and voltages in the process to supply connected electric
motors. They become major sources of interference, generating both line-conducted and radiated
interference. The additional use of line filters, also called interference suppression filters, and
installation in a metal housing or a switch cabinet further improve the existing interference immunity.
For the best possible damping of interference, special line filters have been developed which
guarantee you easy assembly and installation along with the necessary electrical reliability.
However, effective EMC countermeasures is only ensured if the suitable filter is selected for the
particular drive and installed in accordance with these EMC recommendations.

Selection of line filter to reduce line-conducted interference

To reduce line-conducted interference, use the appropriate line filter for each frequency inverter.
The below table show you a list of the available line filters for OMRON 3G3RX frequency inverter.
The line filters up to 46A (200V class) or 58A (400V class) rated current are built in footprint style,
they are fitted behind the respective frequency inverter, and thus require no additional surface
space for installation. These filters are intended for installation in switch cabinets as standard.
Vertical mounting next to the frequency inverter is also possible.
The line filters from 64A (200V class) or 75A (400V class) rated current are built only in booktype
style, and can be installed beside the frequency inverter.
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