Purchase now the 20-750-EMC1-F5, an essential electromagnetic compatibility (EMC) filter kit specifically engineered for Allen-Bradley PowerFlex 750-Series variable frequency drives. This internal filter is vital for maintaining high signal integrity and ensuring compliance with international radio frequency interference (RFI) standards in demanding industrial environments.
What Is the 20-750-EMC1-F5?
The 20-750-EMC1-F5 is a Category C2 internal EMC filter designed for PowerFlex 753 and PowerFlex 755 AC drives in Frame 5. Its primary function is to attenuate conducted electromagnetic emissions that are generated by the high-frequency switching of the drive’s power transistors. Without a proper filter like the 20-750-EMC1-F5, these emissions can propagate through the power lines and interfere with sensitive electronic equipment, such as programmable logic controllers (PLCs), encoders, and communication networks. The C2 rating signifies that the filter is suitable for both «First Environment» (residential or public low-voltage networks with restrictions) and «Second Environment» (industrial) applications. By being an internal component, it saves significant cabinet space compared to bulky external line reactors or filters.
Key Technical Specifications
- EMC Category: C2 (EN61800-3)
- Compatible Drive: PowerFlex 750-Series (PF753, PF755)
- Frame Size: 5
- Mounting: Internal chassis plug-in
- Voltage Range: Up to 480V AC
- Operating Frequency: 50/60 Hz
- Standard Compliance: CE, C-Tick, RoHS
Architecture and System Performance
In a Frame 5 PowerFlex architecture, the 20-750-EMC1-F5 integrates directly into the power assembly. This integration ensures a low-impedance path to ground for high-frequency noise, which is much more effective than external solutions with long lead wires. It works in conjunction with the drive’s common-mode cores to provide a comprehensive suppression strategy. This is particularly important for systems utilizing long motor cable runs, where the capacitive coupling between the cable and ground can significantly increase the leakage current and RFI levels.
Installation Advice
When installing the 20-750-EMC1-F5, it is critical to ensure that the drive is used on a solidly grounded «Wye» power system. If your facility utilizes an ungrounded (IT) or high-impedance grounded system, the internal jumpers to the filter must be disconnected to prevent potential damage to the drive components during a ground fault. Always verify that the mounting screws are tightened to the correct torque to maintain a solid mechanical and electrical ground connection to the chassis.
Frequently Asked Questions
Q: Does this filter eliminate the need for shielded motor cables?
A: No, the 20-750-EMC1-F5 is designed to work in conjunction with shielded cables. For C2 compliance, shielded cables must be used and properly grounded at both ends.
Q: Can I retrofit this filter into an existing Frame 5 drive?
A: Yes, the kit is designed for field installation, but it must be performed by a qualified technician while the drive is fully powered down and discharged.
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