vfd output current measurement

vfd output current measurement

I can provide whatever details you need so that we can sort this out. The output voltage of a PWM vfd has very high harmonic content because it is pieced together by switching discrete voltages....it is a stairstep, not a curve. I would use something like this. It will be as much use as a chocolate frying pan, but it meets the spec. AC ammeter for measuring VDF output current, Electric power & transmission & distribution Forum. If the THD is really 60%, it is puzzling that the motor spins at all. We had a chance to see 3 samples of the current and voltage produced by VFD. Not just a stair-step sin, but repeated pulses with the width of each pulse "modulated" to give the right fundamental component. It sounds like the current and voltage are measured before the VFD so these will be measuring a current and voltage at 60 Hz, is this correct? Thanks Aditya. It is voltage that cannot be measured without a low pass filter. & Reliability, Sales & However, at the high speed, there are all sorts of spikes and odd readings sometimes as high as 50 Amps and these currents are way too high for this motor to have ever used. If it looks unusual compared to others you might investigate by looking for unusual ripple pattern on the dc voltage within the vfd. Already a member? What is it about our circuit's (identical to the AD demo board schematics, filters, etc are all in place) design or possibly register settings that may be causing this? Ha-ha, that made me chuckle. delivered monthly or quarterly to your inbox. I am attaching a PNG of the graphed data from this device for your reference. Click Here to join Eng-Tips and talk with other members! Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free. Here is my thoughts on these two items fwiw: One thing just to mention - the 3 hp example (which was the PWM one) actually did have higher voltage THD than current THD by a factor of 1.5. This is what happens when a contractor blindly follows an ill-conceived project specification. -------------------------------------- This article steps through the measurement sequence for assessing VFD output factors: • DC Bus • Output voltage/current/frequency • Unbalance • Volts/hertz ratio • Output reflections Figure 1 illustrates the components of a VFD input ac-to-dc converter and output pulse width modulated signal, with the … As at our company we have a requirement of a a power quality analyzer and the auditor is going to connect the analyzer For the HT side on the CT and PT. We're sorry. Keeping our warfighters safe and delivering them a competitive advantage is a key goal of departments of defense around the world. Making current measurements with VFDs in circuit, EngineerZone Uses cookies to ensure you get the best experience in our community. One thing to note – the idea that voltage THD > current THD applies to the output of the vfd. Electrical Signature Analysis does not indicate any issues with load. Most VFDs can provide analog output signals that are proportional to output current and speed. With Creo 7.0, you will be able to design the most innovative products faster than ever before, keeping you on the cutting edge of product design and ahead of your competition. This white paper shows how collaborative robots can play a role in helping companies succeed in the Covid-19 world: to help with social distancing, ramp up new lines quickly and reshore existing products due to interrupted supply chains. If you take a pure square wave, the THD is 48.34 %. Please let us know here why this post is inappropriate. Finally, you'll never receive email notifications about content they create or likes they designate for your content. We are measuring the current at the input of the VFD, so it is not an issue of trying to measure the output side currents. What would be the best way to measure this signal as it is differential? About AMP   

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