Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Jackal on April 25, 2011, 09:32:52 PM

Title: Power supply question
Post by: Jackal on April 25, 2011, 09:32:52 PM
 Hello,

I am having trouble with the availability of the Dugong drives. Mine have been on order since March, but they do have the Whales in stock.

The power supply transformer in my Hurco now is  60 volts x ( 1.414 bridge rectifier) = 84.84 volts output.

The servo motors are 90VDC, 20A peak & 12A continuous.


Dugong drives are 160v & 35A.

The Whales are 80v & 20A.

Is there any way I could drop my power  supply down a few volts and use the Whales?

Or, do I really need the Dugongs because of the servos  increasing the current  during  coast down?

There is a braking resistor they have specifically  for the Whale & Dugong.

This is just a thought I'm knocking around to get my retro started. I would like to get the dirty work out of the way  before the weather starts getting too hot.

Plus the Whales are $70 each cheaper than the Dugongs.

Thanks in advance ,
JAckal
Title: Re: Power supply question
Post by: ostie01 on April 25, 2011, 09:45:51 PM
If it was me, the only way it can be done is adding some high power diode in series.

You will get about 0.7v in voltage drop per diode.

Jeff
Title: Re: Power supply question
Post by: Jackal on April 26, 2011, 09:36:48 AM
Thanks Ostie.

For the amount in savings on the drives would it be feasible to buy/build a new power source?
Would the 5+ volts really make that big of a difference of the performance on the servos?

Thanks,
JAckal
Title: Re: Power supply question
Post by: DennisF on April 26, 2011, 11:41:30 AM
If your power supply is running on 220 V you can cut the voltage in half by running it on 110 V I run my Gecko servo drives that way works fine my machine has large servo motor's.

Dennis
Title: Re: Power supply question
Post by: Jackal on April 26, 2011, 01:15:03 PM
How would that affect  the performance? The servos are rated at 90vdc and I am running 85vdc.  If It was cut in half that would leave 42.42vdc.

Thanks,
JAckal :)
Title: Re: Power supply question
Post by: DennisF on April 28, 2011, 11:42:05 AM
I run my machine at 45 V runs fine depends on how fast you want to run the cutter for small cutter's you can't run them to fast so you realy won't notice any difference on my machine the servos are 120 V

Dennis
Title: Re: Power supply question
Post by: Hood on April 29, 2011, 04:20:37 AM
Jackal, have you looked at the Granite drives, I seem to remember they have higher volt options although they are maybe a bit more costly?

Hood
Title: Re: Power supply question
Post by: Jackal on April 29, 2011, 07:52:19 AM
Hood,

I haven't looked at them. I keep forgetting about that drive.

Thanks,
JAckal
Title: Re: Power supply question
Post by: Hood on April 29, 2011, 11:35:54 AM
I have never used them but can only recall good things about them. Other good thing is they can also drive BLDC (reduced current if I recall) but could be a good option if thinking of upgrading the motors in the future.
Hood
Title: Re: Power supply question
Post by: Jackal on May 02, 2011, 05:16:15 PM
I have checked with Rutex, Granite,  They won't return e-mails or answer the phone. Gecko hasn't replied back yet on the email.

Viper finally got back with me today.


 Are people really that busy and can't return calls or e-mails concerning sales?

It seems that you save up your money & do a lot of research for a retro, and nobody wants your business. ??? ???

I hope the rest of my retro goes easier. ;D

Thanks to Hood, Ostie and many others on here for help.

If I can just find someone to take my money ( and give me some parts), it will get started.

Just ranting a bit ;)

JAckal
Title: Re: Power supply question
Post by: Hood on May 02, 2011, 05:24:15 PM
Its a Holiday long weekend in the UK so possibly similar in other parts of Europe?
I was looking at the cncdrives webshop earlier and they said the Dugongs were in stock, did you try direct from them or was it just via CNC4PC that you tried?

Hood
Title: Re: Power supply question
Post by: Jackal on May 02, 2011, 05:47:49 PM
Went through the CNC4PC site. He didn't have any of the parts in stock, or the  breakout boards & connectors for making the Dugongs easy to connect. I paid back in March and they kept saying next week, next week. I have already asked for a refund.

According to sources, it will be the middle of May before any are ready. ::)

Thanks for checking into that, Hood.

I will go directly to the source of the Dugongs.

The shipping may be a little more, but I will get what was  originally wanted.

Sometimes in aggravation, I go blind and miss the obvious.

Thanks a lot , Hood.

JAckal
Title: Re: Power supply question
Post by: Hood on May 02, 2011, 05:49:16 PM
His site says they are in stock but maybe the sites not been updated, fingers crossed.
Hood
Title: Re: Power supply question
Post by: Jackal on May 02, 2011, 09:37:50 PM
Good News!

I contacted Hungary ( CNC drives  webshop) about shipping, Duty taxes, VAT, etc.

The owner of Dugong contacted me and said:

Jack,
 
Thank you for your e-mail and for your interest in our products.
 
We have a US distributor ( http://www.cnc4pc.com ), I think that it could be faster and more cost effective for you if you order drives from CNC4PC shop.
Currenty they are out of stock from the dugong drives as I know, but we will ship an express package the coming week and then they could fullfill your needs.
 
 
Best Regards,
                       Balazs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Balazs Klincsik
50 Kozepdeindoli ut, Pecs, 7635 Hungary

I'm gonna wait on the Dugongs!!!!!!!!!!!!!!