Schaublin 125-CNC retrofit.

Aciera wrote: Yes, I tried running the spindle motor on my aciera mill from the 70s on a VFD, it worked only for a couple of weeks before the motor gave out.

I have been running the original motors on my 1964 Holbrook lathe and (probably) 1970s Harrison milling machine on VFDs for many years now with no issues. Possibly Brook Motors used a different insulation to the Aciera supplier?

Wondering if those using a VFD in their home shop have used a AM radio to get a feel about the amount of radiated electrical noise emitted ?
VFDs made in the 1990s could stop the neighbours listening to " The Rush Limbaugh Show" . I thought that was a design feature ----
Just curious if the newer VFD s affect AM radio reception .

Mark
Noticed that Jaro ( 2-speed spindle configuration ) has posted his new working HAL & INI files for his Schaublin Mill. Think his mill uses a 2 speed transmission .
Might look at how he used andypugh's code .

I have been running the original motors on my 1964 Holbrook lathe and (probably) 1970s Harrison milling machine on VFDs for many years now with no issues. Possibly Brook Motors used a different insulation to the Aciera supplier?

I know there are people out there who have been running motors with isolation class B on VFD's for years. I guess what I'm trying to say is that using a VFD on motors with isolation class lower than F can indeed destroy the motor. So really it comes down to how badly it's going to hurt to replace that motor.

Wondering if those using a VFD in their home shop have used a AM radio to get a feel about the amount of radiated electrical noise emitted ?

VFD's are noisy devices that is why the manuals tell us to follow proper grounding and filtering practice. Usually interference comes from installations that have been poorly executed. The most annoying problem I have is that the filters sometimes trigger the RCD.

Aciera wrote: I know there are people out there who have been running motors with isolation class B on VFD's for years. I guess what I'm trying to say is that using a VFD on motors with isolation class lower than F can indeed destroy the motor. So really it comes down to how badly it's going to hurt to replace that motor.
.

I wonder if it is relevant that I have the motor cables running through a common-mode chole at the VFD outlet?

The motor has an over long shaft to mount the variator. If I replace the motor with a generic induction motor, then I will also have to replace the variator with a simple belt drive, probably poly-Vee.

Peter (Trilobite) replaced his motor, and used a VFD. I am tempted to risk it as is. If I kill this motor, it is no big deal, then I have to replace it and replace the variator with a poly vee belt drive. It would seem the risks are a slightly increased fire hazard and the financial risk of the insulation shorted motor taking the VFD with it over the Jordan.

Does insulation failure and shorting cause a fire risk outside the motor, or just a stinky dead motor?