Machsupport Forum

Third party software and hardware support forums. => Mach3 and G-Rex => Topic started by: whatda? on January 29, 2008, 02:26:55 AM

Title: G100 and VFD`s
Post by: whatda? on January 29, 2008, 02:26:55 AM

Hi all,

I am trying to control HSD (cnc Router) spindle speed with the G-100,through a VFD and not sure
if I can.
The VFD manuals states it can be controlled 4 ways
1. By the digital Keypad (on the vfd)
2. 0 -10 volts input.....        I understand the G-100 outputs at only 5v ,Analog.
3. 4 -20mA input......
4. RS-485 comm port
5. Potentiometer on the keypad (on the vfd)

Any help or info would be great.
Regards
whatda?

Title: Re: G100 and VFD`s
Post by: Chaoticone on January 29, 2008, 12:57:09 PM

Does your VFD have a scaling parameter for input analog voltage. It would be used to tell the drive that 5V=10V.

Brett

Title: Re: G100 and VFD`s
Post by: whatda? on January 29, 2008, 03:17:59 PM

Thanks for the reply,

Sorry I am unsure if the VFD has or can  scale parameters,
How would I tell, would the manual say this.

Regards
whatda?

Title: Re: G100 and VFD`s
Post by: Chaoticone on January 29, 2008, 08:32:13 PM

The manual should. Do you have a pdf manual you can post or link to one?

Brett

Title: Re: G100 and VFD`s
Post by: Peter Homann on January 29, 2008, 11:34:53 PM

Quote from: whatda? on January 29, 2008, 02:26:55 AM

Hi all,

I am trying to control HSD (cnc Router) spindle speed with the G-100,through a VFD and not sure
if I can.
The VFD manuals states it can be controlled 4 ways
1. By the digital Keypad (on the vfd)
2. 0 -10 volts input.....        I understand the G-100 outputs at only 5v ,Analog.
3. 4 -20mA input......
4. RS-485 comm port
5. Potentiometer on the keypad (on the vfd)

Any help or info would be great.
Regards
whatda?

You could use a DigiSpeed-GX. It was designed for this purpose and converts the 0-5Vdc from the G100 to an Isolated 0-10Vdc suitable for your VFD.
http://homanndesigns.com/store/index.php?main_page=product_info&cPath=1&products_id=21

Cheers,

Peter.

Title: Re: G100 and VFD`s
Post by: whatda? on January 30, 2008, 12:25:10 AM

Thanks for the feed back,

Before I buy anything else for this setup I wanted to be sure
that there wasnt any other way,something I missed.

I have attached the manual for the VFD,
If anyone can see whether I can do it or not ,I would
be greatful if someone could let me know.

Title: Re: G100 and VFD`s
Post by: Chaoticone on January 30, 2008, 08:02:10 AM

I think it may be parameter 50, Pot. Freq. gain. Is this all there is to the manual?

Brett

Title: Re: G100 and VFD`s
Post by: whatda? on January 30, 2008, 03:51:28 PM

Thanks Brett,
I have tryed posting the user manual, but it would not upload
The one I sent last post was the quick start guide.

From the manual all it says on parameter 50 is

PR.50
Potentiometer Frequency Gain............ Factory setting 100.0
Setting 0.10 to 200.0% .....................Unit 1%

This parameter sets the ratio of analog input Vs Frequency output


Which sounds like what I am after, would I set it to 200% ? then.
ie 5volts = to 10 volts input.

Thanks
regards

whatda?

Title: Re: G100 and VFD`s
Post by: Chaoticone on January 30, 2008, 05:11:30 PM

Yup, I think that is what you will need to do. Give it a try and see.

Brett

Title: Re: G100 and VFD`s
Post by: whatda? on January 31, 2008, 03:02:30 PM

Thanks for your help,

I ran out of time on this.
It sucks when work gets in the way of a good hobby!

Will be away awhile ,let you know how It go
when I get back.
regards
whatda?

Title: Re: G100 and VFD`s
Post by: chad on February 15, 2008, 01:06:04 AM

My vfd would not let me scale the analog input that high. What I did instead was double the max drive frequency.

Chad