Order now the 20-750-EMC1-F3, a high-quality internal electromagnetic compatibility filter kit for the Allen-Bradley PowerFlex 750-Series. This Category C2 filter is essential for Frame 3 drives to maintain signal integrity and comply with international RFI emission standards.
What Is the 20-750-EMC1-F3?
The 20-750-EMC1-F3 is an internal EMC/RFI filter designed to mitigate electrical noise in PowerFlex 753 and 755 Frame 3 AC drives. In high-power switching environments, VFDs naturally generate radio frequency interference (RFI). This filter serves as a barrier, ensuring that high-frequency noise does not escape the drive and travel back into the AC power lines. The «C2» rating means this filter is designed for use in both industrial and restricted residential areas, providing a higher level of suppression than standard C3 filters. Its internal mounting design keeps the drive footprint compact while providing the necessary protection for nearby sensitive electronics, such as encoders and high-speed communication modules.
Key Technical Specifications
- EMC Category: C2 (Restricted Distribution)
- Compatibility: PowerFlex 750-Series (Frame 3)
- Voltage Compatibility: 200V…480V AC
- Frequency: 50/60 Hz
- Mounting: Internal to the drive chassis
- Cooling: Passive, utilizes drive airflow
- Standard Compliance: EN61800-3, CE
Installation Advice
To install the 20-750-EMC1-F3, the drive power must be completely removed. The kit mounts directly to the power terminal section. It is vital to ensure that the ground connection between the filter and the drive chassis is tight; a loose ground will significantly reduce the filter’s effectiveness. If you are using an isolation transformer, the filter should be installed on the secondary side for maximum suppression of common-mode noise. For long motor cable runs exceeding 50 meters, consider using an additional output reactor to complement the internal EMC filter.
Advanced Control Architecture
In the PowerFlex 750 system architecture, the 20-750-EMC1-F3 integrates into the drive’s digital control scheme by ensuring that the feedback loops are not corrupted by electrical noise. This is particularly important for drives utilizing the 20-750-ENC-1 encoder module for high-precision motion control. Without proper EMC filtering, the high-frequency switching noise can induce jitter in the encoder feedback, leading to speed instabilities and reduced motor performance.
Frequently Asked Questions
Q: Does the 1794-PS3 power this module?
A: No, the 20-750-EMC1-F3 is a passive filter for the main AC power bus of the drive and does not require external 24V DC power to operate.
Q: Can I install this filter while the drive is mounted on the DIN rail?
A: Yes, as long as the drive is powered down and there is enough access to the internal terminal area, the filter can be retrofitted without unmounting the drive.
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