Schaffner Group
User and Installation Manual
LCL Filter
May 2018
3/21
i. LCL filter
Product characteristics and field of application
The LCL family FN6840 have been designed for AFE (Active Front End) drives. In addition, the LCL filter
can also be applied in combination with other AIC (Active Infeed Converter) application in case the
specification does fit to their requirements.
An LCL filter belongs as a functional part to the AFE or AIC. As a functional part it provides an
impedance between grid and drive, which is necessary to connect the AFE to the grid and to control the
input current. Depending on the grid impedance and drive settings, the LCL filter can limit the ripple
current generated by the AFE/AIC to a level of <5%.
The ready to be connected compact enclosed filter includes all the necessary LCL components in one
package.
The standard FN 6840 LCL filter series from Schaffner has the following key features:
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Current and voltage range of 25 A … 380 A @ 50°C, up to 480 VAC 50/60Hz
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Versions with or without resonance damping
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Versions without cooling fan and without power supply (up to 250A)
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Versions with cooling fan and with power supply (380A only)
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Versions in IP 00
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Custom specific adaptations to fulfil dedicated requirements
Typical examples of regenerative motor drives applications:
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Elevator, hoists and cranes, transportation systems
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Machine tools, machines with frequent breaking cycles
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Centrifuges, flywheels (when switched off )
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Winder / Unwinder, rolling mills run-out tables
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Press feeders
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Test stands
Typical examples of other AIC applications:
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Renewable energy, e.g. Windgenerator or Photovoltaic inverter
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Energy storage or battery charging systems
To fulfill customized application requirements please contact our local sales and support organization.
The LCL filter from Schaffner can be configured in different ways (with/without resonance damping,
with/without cooling fan).
This user manual is intended to support designers, installers, and application engineers with filter
selection, installation, application, and maintenance.
For additional support, please feel free to contact your local Schaffner sales and support organization.
ii. Important user notice
Schaffner LCL filters are designed for the operation on the input (grid) side of power electronic
equipment with AFE (Active Front End) or AIC (Active Infeed Converter) in balanced three-phase power
systems, like typically used for AC motor drives and other converter systems. Filter suitability for a given
application must be determined by the user on a case by case basis. Schaffner will not assume liability
for any consequential downtimes or damages resulting from the use of LCL filters outside of their
specifications.
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