Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Flipz01 on June 10, 2009, 11:52:38 AM

Title: VFD Suggestions
Post by: Flipz01 on June 10, 2009, 11:52:38 AM

I'm currently using a 15HP ELTE spindle and driving it with a GS3-4015 VFD from Automation Direct.

My problem is that I can't get the spindle to run below about 100 RPM.  The VFD just can't get the job done.

Anybody out there know of a VFD that will actually drive a 15HP spindle down to 10-15 RPM?

Title: Re: VFD Suggestions
Post by: Hood on June 10, 2009, 02:51:57 PM

I am not sure the reason you cant go below 100rpm, all motors I have run via a VFD can crawl round an 1rpm or less, sounds like it may be a parameter you are needing to adjust. Having said that I dont like VFDs much as your torque drops off rapidly when you slow things down too much, or that has certainly been my experience with them.
Hood

Title: Re: VFD Suggestions
Post by: Flipz01 on June 10, 2009, 03:17:51 PM

I've been through this with the guys at Automation Direct.  They tell me that it is nearly impossible to turn a large spindle below about 1%, and that's what I'm getting.

What type of spindles / VFDs do you run?

Title: Re: VFD Suggestions
Post by: Hood on June 10, 2009, 03:21:25 PM

Its always been small compared to you, just 4KW the biggest, have servo on the lathe which is 12.5Kw. Might be worth a PM to panaceabeachbum and ask him as I think he has a 20Hp spindle via VFD on his lathe.
Hood

Title: Re: VFD Suggestions
Post by: Flipz01 on June 10, 2009, 03:45:05 PM

I'll give it a go.  The guys at Siemens can't tell me (?), so I'm asking around.