Danfoss Harmonic Filter for VFDs in Saudi Arabia
Saudi Power Factor Company provides the Danfoss harmonic filter for VFDs in Saudi Arabia, pairing Danfoss passive AHF and active AAF filters with detuned capacitor banks on plants that run many drives. We are an authorised Danfoss partner. Drives and capacitors interact: plain capacitors can resonate with drive harmonics, so the filter and the bank are designed together.
What you receive: a written proposal naming the filter model, the current rating, the associated PFC bank, the lead time and the price within one working day of your drive list or survey report. Request a quotation
What is the power factor of a VFD drive?
The displacement power factor of a standard drive is close to unity, but the input current is distorted, so the true power factor is lower and the harmonic content is high. A plant with many drives therefore shows a poor true power factor and heated transformers even when the bill reads well. Capacitors added without study can make this worse by creating a resonance near the 5th or 7th harmonic. Read more about this on our harmonics and nuisance trips page.
When does a Danfoss harmonic filter for VFDs in Saudi Arabia pay off?
Not always. A single small drive on a strong supply may meet the limits without one. A group of drives that make up a large share of the transformer load usually needs a filter. We decide from a measurement, comparing the current distortion at the point of coupling with the IEEE 519 limits and the project specification. A power quality survey gives the numbers.
What do the AHF 005 and AHF 010 filters do?
| Item | Range / specification | Standard | Typical lead time |
|---|---|---|---|
| AHF 005 passive filter | Brings drive current distortion to about 5 percent at full load | IEEE 519 reference | Agreed in the quotation |
| AHF 010 passive filter | Brings it to about 10 percent at full load, for cost-sensitive cases | IEEE 519 reference | Agreed in the quotation |
| AAF active filter | Cancels harmonic current dynamically, in parallel with the load | IEEE 519 reference | 4–6 weeks |
| Detuned capacitor bank beside the filter | 50–1,000 kVAr with 5.67%, 7% or 14% reactors | IEC 61921; IEC 60076-6 | 3–4 weeks |
The AHF 005 gives the lower distortion of the two, and the AHF 010 costs less. An AAF unit suits plants where the load varies a lot, since it adapts to what the drives draw.
How do we combine a Danfoss filter with a PFC bank?
The filter reduces harmonic current at the drive terminals. A detuned bank then supplies reactive power without resonance, because its reactor shifts the resonance point below the lowest harmonic present. An active filter can also supply some reactive current. We state the split between the two in the design and test both at commissioning. See the harmonic filter panels and detuned bank pages.
How does a filter project run?
- Enquiry. You send the drive list, single-line diagram or survey file.
- Measurement. We log current distortion on the incomer and the drive feeders.
- Selection. We choose passive or active filtering and size the PFC bank.
- Supply. Filters are ordered and the capacitor panel is built in Dammam.
- Installation. We connect the filter and the bank on site.
- Commissioning. We re-measure distortion and the power factor.
- Support. We keep spares and offer annual checks.
Danfoss partner questions
Who provides a Danfoss harmonic filter for VFDs in Saudi Arabia?
Saudi Power Factor Company provides Danfoss passive and active harmonic filters for VFD plants in Saudi Arabia, with the PFC bank designed alongside. We are an authorised Danfoss partner. The proposal follows from a measurement of your supply.
What is the cost of a Danfoss harmonic filter?
Price depends on the current rating, whether the filter is passive or active, the enclosure, the cooling and the installation work. Larger drives and active filters cost more than small passive ones. Send the drive list and we price each option for comparison.
How long does supply and installation take?
Lead time depends on the model, the stock position and the site work. Our typical figure is 4–6 weeks for an active filter and 3–4 weeks for a detuned bank. Installation dates follow your shutdown plan.
What is the difference between AHF 005 and AHF 010?
Both are passive filters that sit in series with a drive. The AHF 005 reduces the current distortion more, to about 5 percent at full load, and the AHF 010 reduces it to about 10 percent for a lower price.
Can I use capacitors on the same bus as VFDs?
Yes, with detuning reactors and a harmonic check. The reactor stops the bank from resonating with drive harmonics. We confirm the arrangement through the survey and test it under load.
Do you support Danfoss low harmonic drives?
We assess where a low harmonic drive is a better choice than a filter, and where a filter on existing drives costs less. Our recommendation comes from the measured data.
Looking for a Danfoss harmonic filter for VFDs in Saudi Arabia? Send your drive list or survey file and receive a quotation within one working day.
Email: inquiry@saudipowerfactor.com | Request a quotation