What causes this motor sound to appear after a few minutes - running on VFD?

[Rata222]

Just an update...and again thank you for all the help. I tried the Autotune function and it may have quieted the squeal a very little bit ??? , but the chirping still came back after around four minutes.
I rewired the motor to run through my lathes TECO L510. It still had some squal as expected - but it did not start the chirping at any time. So I guess the cheaper Delta VFD is not as compatible with the motor. I am not sure what I will do next. I would like the convenience of variable speed, but do not like the squeal sound. For what ever reason I don't detect a squeal on my lathe setup.
If I decide to spend the money, any suggestion where to buy an economical, yet quality VFD and inverter rated motor?
Thank you all again for taking the time to help. Jim

 

[Ischgl99]

I have bought VFDs from Dealers Electric and Automation Direct. Good prices and fast delivery. I like Teco VFDs, they are a good value, the Automation Direct units are very good too. I haven’t bought any three phase motors in many years, so can’t recommend any places to get them, but Dealers and AD would likely be good places to look.

 

[markba633csi]

The cheap HY units sold on Amazon seem to perform well- you might just start with the cheapest and work your way up

 

[mksj]

I would recommend the Automation Direct GS20/GS21 VFDs as reasonably priced and work well, I have installed quite a few and the setup and software is pretty straight forward. They are made by Delta, but they are a higher end model and as well as good tech. support and warranty. They are available in a standard model and a NEMA 4 model. Having used some of the HY VFD's I do not recommend them for the same reasons as your are having problems with your current VFD. You do not need an inverter rated motor to use a VFD, in particular at 230VAC,

https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/general_purpose_vfds/gs21-22p0

https://www.automationdirect.com/adc/shopping/catalog/drives_-a-_soft_starters/ac_variable_frequency_drives_(vfd)/washdown_(nema_4x)_vfds/gs21x-21p0