LUST LTi Drives NFE12.3 Line Filter 108339
The LUST LTi Drives NFE12.3 Line Filter with identification 108339 is a 12 amp EMC filter for industrial drive systems. It is installed between the power supply and the drive or machine cabinet input. Its purpose is to reduce high frequency electrical noise generated by servo drives, frequency inverters, and other power electronic equipment. The filter helps the machine meet electromagnetic compatibility requirements and supports stable operation of nearby devices.
The NFE12.3 model is part of the LUST LTi Drives accessory range. The 12 amp rating indicates the current class of the filter. The identification 108339 helps with matching the unit to a machine, selecting compatible options, and maintaining correct records in service documentation.
Function of a Line Filter
Power drives switch current rapidly to control motors. This switching creates conducted emissions on the supply lines. Without filtering, these emissions can disturb other equipment, interfere with communication systems, or cause the machine to fail EMC tests. A line filter provides impedance paths that reduce unwanted noise. It typically includes common mode chokes, capacitors, and sometimes additional components for differential mode attenuation.
The filter must be installed close to the drive or at the cabinet entry according to the EMC concept. Long cables between filter and drive can reduce effectiveness. The filter housing must be bonded to the cabinet ground with a low impedance connection. Input and output cables should be separated to prevent noise from coupling around the filter.
Installation
Mount the filter on a conductive panel inside the cabinet. Use the specified mounting points. Ensure good electrical contact between the filter housing and the panel. Connect the supply lines to the input terminals and the drive lines to the output terminals. Do not reverse input and output. Connect protective earth securely. Use cables with suitable cross section and insulation.
Route filtered and unfiltered cables apart. Keep motor cables shielded and grounded where required. Avoid bundling noisy power cables with encoder or communication cables. The cabinet should have a continuous ground plane. If the machine has multiple drives, each may require a filter or a central filter concept depending on the EMC plan.
Operation
The filter operates passively. It does not require parameter settings. However, its performance depends on correct installation and grounding. The filter rated current must be equal to or higher than the drive input current. The voltage rating must match the supply. If the filter is undersized, it may overheat. If it is oversized, attenuation may be less effective in some frequency ranges.
During operation, the filter should remain cool. A slight temperature rise is normal, but excessive heat indicates overload, poor ventilation, or incorrect wiring. If the drive trips on ground fault or overcurrent, the filter and wiring should be checked. The filter capacitors can retain charge after power is removed. Service personnel must wait for discharge before touching terminals.
EMC Considerations
Machine EMC is a system property. The filter is one part of the solution. Other measures include shielded motor cables, proper grounding, separation of power and signal wiring, and correct drive installation. The filter helps reduce emissions but cannot compensate for poor cabinet layout. For best results, follow the drive manual and the machine EMC plan.
In systems with long motor cables, additional output filters or chokes may be required. These are different from mains filters and are selected for motor side protection and bearing current reduction. The NFE12.3 is intended for the supply side of the drive system.
Maintenance
Regular maintenance includes checking terminals, mounting, and ventilation. Tighten loose connections. Remove dust from the filter surface and cabinet. Inspect for discoloration, swelling, or leakage. If damage is found, replace the filter with a compatible unit. Always disconnect power and wait for discharge before service.
Applications
The LUST LTi Drives NFE12.3 Line Filter is suitable for industrial cabinets containing LTI and LUST servo drives, frequency inverters, and motion controllers. It is used in packaging, printing, machine tools, handling systems, and other automation equipment where EMC compliance is required.
In summary, the LUST LTi Drives NFE12.3 Line Filter 108339 supports clean power supply conditions and reduces conducted noise. Correct selection, grounding, and installation help ensure reliable drive operation and machine EMC performance.
