Most European and Australasian countries require that VFDs are tested to comply with EMC standards.
USA and Asian countries do not have this requirement.
The tests are prescribed as a requirement for CE compliance (Europe) and CTick compliance (Australia and New Zealand).
The laboratory tests require two types of emissions be tested, 1) radiated emissions and 2) conducted emissions.
The major source of problems in the real world, is conducted emissions and these are typically in the re
Hi guys Can someone please explain to me is a 3 phase motor running off a VSD at half speed (25hz) still able to produce its rated nameplate kilowatts?
Hi, I have a pump which is 480V single phase (Split Phase). I have been asked to change the starter on this pump. At present there is a manual starter on the wall. You put it in start and when the motor is up to speed you switch it to run. There is a big capacitor box connected separately. Does anyone know of any starters available for this system with built in capacitors or does anybody have any diagrams do that i can make one myself. Thanks, Rob
There are many energy saving schemes promoted in the industry today, some of these work, but many either can not work, or can not work in the manner that they are promoted. In order to reduce energy consumption, there must first be energy wasted, and second, a means of reducing that energy wastage. You can only save a portion of the energy that is being wasted. If you are serious about saving energy, you must:Establish where energy is being wasted. Determine how much energy is being wasted De
I have been asked to try and get a 250kW induction motor pump-set to generate by running it backward. The theory is fine and covered by a few articles on this site, but there are a couple of problems I would like some help with please! At the motor terminals there are capacitors connected across the phases and an adjustable 3 phase load bank. The motor starter is a softstart with an isolation contactor on the field side (opened when the e/stop is activated). There is also a 3 phase contactor
These days, there are very few people who have managed to avoid that scurge of the internet, SPAM. The origin of the word is unclear, with some suggestion that it cam from a Monty Pythons sketch. I can get upwards of 400 SPAM emails a day and it can be an issue trolling through all that garbage. - I don't and I know that I do miss some legitimate emails because of the filtering that I use, but that is life I am afraid. There is nothing worse than being away and out of contact with the internet
