Industrial / Pressure Switches
Design Guide for Danfoss VLT® Advanced Harmonic Filter AHF 005/AHF 010
Comprehensive design and installation guide for Danfoss VLT® Advanced Harmonic Filter AHF 005 and AHF 010. Includes mechanical mounting, electrical wiring, programming parameters, and technical specifications.
Table of contents
Manual images
Click an image to enlargeQuick guide from the manual
This design guide provides essential information for the installation, operation, and maintenance of the Danfoss VLT® Advanced Harmonic Filter AHF 005 and AHF 010. These filters are designed to mitigate harmonic distortion in electrical systems using Danfoss frequency converters. Key safety precautions include waiting for the specified discharge time before servicing and ensuring installation is performed by qualified personnel only. Proper mechanical mounting and electrical wiring are critical for safe and efficient operation.
Safety and Qualified Personnel
The filters contain high-voltage components and capacitors that remain charged even after power is removed. Always wait for the specified discharge time before performing any service or repair. Only qualified personnel authorized to install, commission, and maintain this equipment should handle the filter. Improper installation can lead to death, serious injury, or equipment failure.
Mechanical Mounting
Mount all filters vertically with terminals at the bottom. Ensure top and bottom clearances of at least 150 mm (5.91 in) for proper ventilation. The filters are cooled by built-in variable speed fans; ensure the fan inlet and outlet are not blocked. For rail-mounted installations, use a backplate to prevent false airflow.
Electrical Installation
The filter includes terminals for mains supply (X1.1–X1.3), output to the frequency converter (X2.1–X2.3), and optional capacitor disconnect (X3.1–X4.3). The temperature switch (terminals A and B) must be connected to the frequency converter to prevent damage from overtemperature. If the filter overheats, the switch opens, and the frequency converter should be programmed to perform an immediate stop or controlled ramp down.
Programming
The frequency converter must be programmed to recognize the filter's temperature switch. Common programming involves connecting the switch to a digital input and configuring it to 'Coast Inverse' or 'Motor Thermal Protection'. Refer to the programming section for specific parameter settings for digital inputs and outputs.
Specifications
The filters are available in various voltage and current ratings. They are designed for operation with VLT® HVAC Drive FC 102, VLT® Refrigeration Drive FC 103, VLT® AQUA Drive FC 202, and VLT® AutomationDrive FC 301/302. Detailed technical data, including power loss, acoustic noise levels, and mechanical dimensions, are provided in the specifications section.
Spare Parts
Spare parts, including capacitor kits, fan kits, and fuses, are available. It is crucial to select parts based on the specific revision number of the filter, which can be identified from the serial number on the product label.
Manufacturer information
Danfoss A/S
Practical help
Common problems
Filter overheats repeatedly
Evaluate airflow and installation conditions. Check if the fan inlet or outlet is blocked, or if the fan or fan control is defective.
Resonances in the DC link
Disable dynamic DC-link compensation by setting parameter 14-51 to [0] Off.
Capacitor disconnect issues
Ensure capacitors are not connected at full load or disconnected at no load. Use a 3-phase contactor for disconnection.
Before use
- Verify the filter is compatible with your specific Danfoss frequency converter model.
- Ensure installation is performed by qualified personnel only.
- Check the nameplate for correct voltage and frequency ratings.
- Verify that lifting equipment is suitable for the unit's weight and use dedicated lifting eyes.
- Confirm that the environment meets the specified temperature and humidity requirements.
- Ensure all electrical connections are tightened to the specified torque.
Images and diagrams
- Connection Diagram (Page 25): Shows terminal connections for mains, motor, and optional capacitor disconnect.
- Lifting Methods (Page 21): Illustrates safe lifting procedures for internal and external fan filters.
- Airflow Diagrams (Page 23): Shows correct and incorrect airflow configurations.
- Terminal Layout (Page 67): Shows terminal designations for X1, X2, X3, X4, A, and B.
Model compatibility
- Designed specifically for Danfoss VLT® frequency converters.
- Not recommended for use with third-party frequency converters.
Manual page author
Emily Carter
User documentation editor
Prepares concise manual descriptions and highlights the most useful setup, operation, and maintenance information for readers.