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I have a noise problem on a VGA monitor when the motor rotates which is driven by an INVT GD20-ORAG-S2-EU inverter. There is already a FLT-PS2004L-CG filter on the inverter power supply.
Unfortunately the motor is positioned at a distance of about 250 mm. from the display (I've already tried moving it 1/2 meter away). Both the power cable and the VGA cable do not go through the side where the shielded motor power cable is.
Does anyone have an idea how I can get rid of this ailment?
The introduction of an inverter into a system may cause noise/interference commonly called electromagnetic interference (EMI) or radio frequency interference (RFI). Electromagnetic disturbances propagate along conductors and couple by means of parasitic capacitances. Here are some possible solutions:
- Always use the appropriate line filter.
- Verify that grounding is properly connected on all equipment. Proper ground connection often solves the problem.
- Insert ferrite rings on the cables going from the inverter to the motor.
- Use shielded cables to connect the motor to the inverter.
- Check the passage of the cables it is not recommended to pass the inverter conductors in the same pipes or ducts where other conductors of other equipment are laid. Conductors (even if insulated) can interfere with each other by coupling through parasitic capacitances.
You can also act on the switching frequency setting parameter (for the GD20/GD350 it is parameter P00.14). The manufacturer has set a predetermined value based on the power of the inverter. Here she is indicative table the advantages/disadvantages of changing the switching frequency.
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