CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!!

on 2003-09-05 06:45:20 UTC
You will want to connect all three capacitors in parallel. Then use one
bleed resistor.

You cannot parallel the outputs from the three bridge rectifiers.

Bob Campbell

----- Original Message -----
From: "rogersmach" <rogersmach@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 04, 2003 9:40 PM
Subject: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!!


> Hello,
>
> I'm in the process of assembling a CNC control consisting of the
> following: 4 axies, 3-40 in/lb DC brush type servo motors that are
> rated 40v/K at 2500 rpm 13.7 amps maximum current. 1 servo motor for
> the 4th axis which I have not obtained yet but will be smaller. I'm
> using Mach2 for a control program. Bob Campbell's Sound Logic
> breakout board for Mach2. I'm using Gecko 320 drives. I'm using a
> power supply from the old control of my bridgeport which has 4 set of
> output taps on the secondary and their voltage values are: 1 set at
> 31 volts AC, 1 set at 10 volts AC, 1 set at 4 volts AC and the other
> set read 0. In talking with Mariss at Gecko drive (brilliant man,
> hate to bother him), he suggested that I use about 60 volts DC with
> his drives. Which would reduce the speed with little effect on the
> torque (if I understood him correctly). And I would need a 100 volt
> DC capacitor rated at 45,000 macrofarad or greater. I could not
> locate a cap with this value and had to settle for 3 100 volt
> computer grade DC caps at 15,000 macrofarad. Question: Can I wire
> these 3 capacitors in series to achieve the same Macrofarad value? I
> intend on using a 1.2k 5 watt bleed resistor on each. Next Question:
> Would it be possible for me to run the 31 volt taps through one
> bridge rectifier and 10 volts through another bridge rectifier, wire
> them in parallel to get my output up to around 41 volts DC? Is it
> possible to change the configuration of the primary side and get
> higher values? I intend to use the present supply temporarliy to get
> operational, then acquire a more adequate supply later. At the 31
> volts it appears to be pushing the X axis (servo running directly off
> of bridge at 31 volts DC without capacitor and a 2.5:1 reduction)
> about 30 inches/min Id like to get it around 70 or 80 inches /min
> rapid. Any more than that is unsafe on a bridgeport. Any input on my
> inquiries would be appreciated.
>
>
>
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Discussion Thread

rogersmach 2003-09-05 00:05:48 UTC Power Supply and Capacitor Questions Help!! Bernard R 2003-09-05 00:54:55 UTC Re: Power Supply and Capacitor Questions Help!! Bob Jacoby 2003-09-05 03:51:59 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! dougfennell2000 2003-09-05 05:20:40 UTC Re: Power Supply and Capacitor Questions Help!! Robert Campbell 2003-09-05 06:45:20 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! Jon Elson 2003-09-05 09:04:17 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! turbulatordude 2003-09-05 10:42:37 UTC Re: Power Supply and Capacitor Questions Help!! sizing Mark Thompson 2003-09-05 12:04:14 UTC RE: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! R Rogers 2003-09-06 07:42:04 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! R Rogers 2003-09-06 07:42:11 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! R Rogers 2003-09-06 07:42:31 UTC Re: [CAD_CAM_EDM_DRO] Re: Power Supply and Capacitor Questions Help!! Bernard R 2003-09-06 09:58:08 UTC Re: Power Supply and Capacitor Questions Help!! turbulatordude 2003-09-06 10:24:22 UTC Re: Power Supply and Capacitor Questions Help!! Jon Elson 2003-09-06 15:41:17 UTC Re: [CAD_CAM_EDM_DRO] Re: Power Supply and Capacitor Questions Help!! Jon Elson 2003-09-06 15:48:28 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! Jon Elson 2003-09-06 15:54:53 UTC Re: [CAD_CAM_EDM_DRO] Power Supply and Capacitor Questions Help!! Mariss Freimanis 2003-09-06 17:46:36 UTC Re: Power Supply and Capacitor Questions Help!! Jon Elson 2003-09-06 21:23:31 UTC Re: [CAD_CAM_EDM_DRO] Re: Power Supply and Capacitor Questions Help!! R Rogers 2003-09-09 07:45:51 UTC Re: [CAD_CAM_EDM_DRO] Re: Power Supply and Capacitor Questions Help!! Jon Elson 2003-09-09 10:20:32 UTC Re: [CAD_CAM_EDM_DRO] Re: Power Supply and Capacitor Questions Help!!