Hunter HVLS Installation Manual page 34

REFERENCE
Type RF EMI/RFI Filters – Additional Technical Information
In addition to the Product Selection brochure, this Application Note contains useful information on how to properly connect an EMI/RFI filter, understand
the current ratings, and parallel connections for higher ratings when necessary.
Type RF EMI/RFI filters are built with Touch Safe Construction.
• In compliance with international safety standards, and in conformance with the CE Low Voltage Directive, these filters are supplied as
standard with touch safe terminations on all units rated 150 Amps and below.
• Units rated higher than 150 Amps provide tab terminals for customer addition of wiring devices.
Connection of the Type RF EMI/RFI filters is intended for use at the input side of a variable speed drive or inverter ONLY.
• DO NOT use these filters on the output (load side) of an inverter or drive.
• Good wiring practices will minimize RFI problems, including:
o Route all conductors as close to the panel as possible.
o Physically separate the filter input and output conductors.
o Keep drive input and output leads separated.
o Always keep power and control wiring separated.
o Use shielded wiring where possible.
o Use single point grounding (connect system ground to filter).
• Connect the incoming power conductors to the "Line" side terminals of the filter.
• Connect the "Load" side terminals to the line reactor or drive input terminals.
• The ground termination "G" may also be designated by "PE" or "N".
• Keep all wiring as close as possible to the grounded panel (ground plane).
Type RF EMI/RFI filters are rated in True RMS (trms) amperes.
• Harmonic current distortion will increase the trms current of a system above the fundamental - current (typically motor FLA) of the
connected loads.
• Line reactors (3% or 5% impedance) are useful in reducing harmonic current distortion
and the trms current.
• If minimum 3% impedance line reactors are included in the installation, then the trms
amperes will be lower and the filter can be sized for the reduced load current.
• If the trms amperes of the load to be connected to the filter are known, then select the
filter directly from the RMS amperes selection tables.
• If the trms amperes are unknown, you can select the filters based on the horsepower
(or kW) rating of the load to be connected.
• Determine if a reactor (minimum 3% impedance) will be used in addition to the Type RF filter and select accordingly.
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LINE FILTER (INTERNATIONAL ONLY)