Let me add to this a fantastic effort and many younger electricians would appreciate a beginning to end motor assessment and testing schedule and actions on back of findings. Hope to see more in this area.
Totally understandable about it not working on the inverter, especially a less expensive inverter with a probably dirtier output. The inverter chopping frequency is at least 8kHz and you saw that it kept detecting over 400Hz and it couldn't get a good reference. Not to mention the voltages all over the place. Possibly a higher quality inverter could put out a smother voltage signal, but still may not be good enough for the meter. But the good thing is you can usually reverse rotation in the VFD settings, so no need to redo the connections if backwards. Still an awesome meter with a ton of functions to eliminate having to lug around three or four pieces of equipment on the jobsite. Seriously contemplating getting one, thanks for the video on it.
Thanks for watching and commenting. Yes, this is a cheap little inverter, good for the market it is designed for and does have a very square wave looking output. I have done some more work with this inverter and other instruments and they also struggle with it. It would be good to prove the MYR105 against a more industrial designed VFD with a filtered output, the MTR105 works fine on an injection test set, which has a filtered output. Your penultimate comment is one that I feel I am not really capturing in the videos I am doing. The MTR105 seems to be along a similar concept as multifunction testers that we have for testing fixed installations, just aimed at motors. Not only do you not have to lug around multiple instruments, but the work flow process is also faster as you are not swapping around the connections so much, with a couple of tweaks of the meter functionality, this could be improved further.
Thanks for watching and commenting. The voltage tester is the Drummond MTL20 now manufactured by Martindale; martindale-electric.co.uk/product/mtl20-test-lamp/
Great video!! Ive been wanting one of these mtr105 ever since I got the first release flyer in the mail. But since it doesnt seem to work with inverters or VFD it would not benefit me after all. Thanks for saving me from a potentially disappointing purchase!
Thanks for watching JT. I am not sure why it didn't work on the inverter drive. This is a very cheap drive and converts single phase input to three phase output so not sure if that has anything to do with it. I thought that being only specified up to 400Hz input, the MTR105 had a built in low pass filter, but may be not. The MTR105 does work fine on an injection test set, so I would like to try it out on other inverters, but unfortunately, they are not common in my industry, so I have to try and work something out.
I have not personally approached Megger. To be honest I rarely get responses out of manufacturers unless there are a lot of people highlighting a specific issue. I need to see if I can work out testing it against some other inverters, as it may just be an issue with the cheaper variety.
The 3 phase IR function on the MTR105, only measures between phases and not phase to earth. Therefore it cannot be used on a motor linked in star or delta as this one was. It will only work on split phases, such as motors wire to star/delta starters, or with the terminal block links removed on purpose. Thanks for watching and commenting.
@@ErikNemo There is an explanation and demo of the 3 phase IR test function in another video in my play list for the MTR105. th-cam.com/video/ndtLLjRLIlA/w-d-xo.htmlsi=uhhV4SNEk9Klm75I
TP, I love the video, I love the Megger MTR105 . Advanced engineering at its finest. You’re doing absolutely a fantastic job keep it up.
Thanks TETC, it is a very well built instrument with plenty of functionality - plenty more videos to come on it, so stick around.
Let me add to this a fantastic effort and many younger electricians would appreciate a beginning to end motor assessment and testing schedule and actions on back of findings. Hope to see more in this area.
Thanks for watching and commenting. There will be some other videos on this instrument that look into some of the functions in more depth.
Totally understandable about it not working on the inverter, especially a less expensive inverter with a probably dirtier output. The inverter chopping frequency is at least 8kHz and you saw that it kept detecting over 400Hz and it couldn't get a good reference. Not to mention the voltages all over the place. Possibly a higher quality inverter could put out a smother voltage signal, but still may not be good enough for the meter. But the good thing is you can usually reverse rotation in the VFD settings, so no need to redo the connections if backwards. Still an awesome meter with a ton of functions to eliminate having to lug around three or four pieces of equipment on the jobsite. Seriously contemplating getting one, thanks for the video on it.
Thanks for watching and commenting.
Yes, this is a cheap little inverter, good for the market it is designed for and does have a very square wave looking output. I have done some more work with this inverter and other instruments and they also struggle with it. It would be good to prove the MYR105 against a more industrial designed VFD with a filtered output, the MTR105 works fine on an injection test set, which has a filtered output.
Your penultimate comment is one that I feel I am not really capturing in the videos I am doing. The MTR105 seems to be along a similar concept as multifunction testers that we have for testing fixed installations, just aimed at motors. Not only do you not have to lug around multiple instruments, but the work flow process is also faster as you are not swapping around the connections so much, with a couple of tweaks of the meter functionality, this could be improved further.
0:49 what kind of voltage tester is this?
Thanks for watching and commenting. The voltage tester is the Drummond MTL20 now manufactured by Martindale;
martindale-electric.co.uk/product/mtl20-test-lamp/
Great video!! Ive been wanting one of these mtr105 ever since I got the first release flyer in the mail.
But since it doesnt seem to work with inverters or VFD it would not benefit me after all. Thanks for saving me from a potentially disappointing purchase!
Thanks for watching JT.
I am not sure why it didn't work on the inverter drive. This is a very cheap drive and converts single phase input to three phase output so not sure if that has anything to do with it.
I thought that being only specified up to 400Hz input, the MTR105 had a built in low pass filter, but may be not.
The MTR105 does work fine on an injection test set, so I would like to try it out on other inverters, but unfortunately, they are not common in my industry, so I have to try and work something out.
Have you approached Megger about this and for their views. It always important to know about tool limitations like these.
I have not personally approached Megger. To be honest I rarely get responses out of manufacturers unless there are a lot of people highlighting a specific issue.
I need to see if I can work out testing it against some other inverters, as it may just be an issue with the cheaper variety.
Your channel name is 3 phase but you never even showed the 3 phase IR function lol
The 3 phase IR function on the MTR105, only measures between phases and not phase to earth. Therefore it cannot be used on a motor linked in star or delta as this one was. It will only work on split phases, such as motors wire to star/delta starters, or with the terminal block links removed on purpose.
Thanks for watching and commenting.
@@three-phase562 awesome, thanks for the explanation. Would be great to see a video demonstration of it.
@@ErikNemo There is an explanation and demo of the 3 phase IR test function in another video in my play list for the MTR105.
th-cam.com/video/ndtLLjRLIlA/w-d-xo.htmlsi=uhhV4SNEk9Klm75I