ST500 | When should I use an EMC output filter with my frequency inverter?
The AC drives have unfiltered outputs. For the majority of applications this gives satisfactory performance, however for a small number of applications output filtering is strongly recommended to be able to increase system functionality, system reliability and system longevity.
These applications include but are not limited to:
- Motors without frequency converter suitable isolation (e.g. older motors).
- Long motor cables, up to 200m
- High capacitance motor cables (e.g. fire protection cables)
- Several motors connected in parallel to one frequency converter
- Elimination of high-frequency noise caused by PWM
For motors with insulation not suitable for frequency inverters:
In any case, always check (ask motor manufacturer) the motor specification to ensure that the motor is designed for use on modern frequency inverters!
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