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  • No : 21528
  • Release Date : 2018/08/22 16:28
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Countermeasure against inverter noise

The flow meter indication fluctuates when the inverter (exhaust fan) starts operating.
I changed the wire routing on the inverter output side, but it did not work. Other possible causes include noise from the power supply, and I am considering to insert filters to both the inverter input side and flow meter input side.


Which filter should I use to the inverter input side?
1. Electromagnetic noise filter
2. Line noise filter
3. Radio noise filterIf the problem still persists, what else should I check for?


Inverter
FR-A220-7.5KP (1), FR-A220-1.5KP (1)
Flow meter
ST-581 (2)
Category : 

Answer

You can attach the following filters to the inverter input side:
- Line noise filter (FR-BLF, FR-BSF01)
- Radio noise filter (FR-BIF)  

While it is a good idea to insert a filter on the input side since changing the wire route on the inverter output side has no effect. I also recommend you the following countermeasures:
- Earth (ground)Use a dedicated earth (ground) for the inverter as far as possible.  

 Use the thickest and shortest possible earthing (grounding) cable.  

- Use a metal conduit or shielded cable for the power supply cable.  

- Use twisted pair cables for sensor signal cables.The technical note No.21 (noise and leakage current) provides the summary of relationship between noise and other factors.
Contact us for this material.
Product Name
Inverter, magnet motor drive
Product Category
Others
Series
FR-A500
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