Spellman DXM70N600X3547 power supplies on ebay -70kV 8.56MA

This forum is for specialized infomation important to the construction and safe operation of the high voltage electrical supplies and related circuitry needed for fusor operation.
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Rich Feldman
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Rich Feldman » Sun Nov 20, 2016 8:20 am

Received my PS, but haven't yet read enough of the manual to try powering up the unit. Found a connector in junk box that fits J2; might try the analog controls before the digital approach.

You know those four receptacle contacts in the HV connector? I verified that 2mm "bullet connectors" from the hobby store, which are stubby miniature banana plugs, plug in very nicely.
ec2.PNG
http://www.e-fliterc.com/Products/Defau ... =EFLAEC208 http://stores.aeromicro.com/ec2-device-connector-2/

Andrew, please tell Bern Bareis thanks from me for the PS tip. I hope we haven't seen the last of his posts at this forum, and that he didn't feel unwelcome here.

[edit]
Young William wrote: "The extent of my knowledge is that: I need this power source to transfer at the very minimum around 35kv to the vacuum MDC feedthrough. So what I need chords for are: firstly, from the plug on my wall to the power supply next from the power supply to a computer as that is how you control the output I believe and then finally from the power supply to the MDC feedthrough on the vacuum chamber."

Sorry, you have to show more progress on learning about electricity before getting help from me. It's not a thing to skip on the road to fusion, though a couple of neutron clubbers have gotten away with it.
Last edited by Rich Feldman on Sun Nov 20, 2016 5:03 pm, edited 2 times in total.
All models are wrong; some models are useful. -- George Box

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Jim Kovalchick
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Jim Kovalchick » Sun Nov 20, 2016 1:26 pm

Put in new line in fuses, and my unit now powers up and connects to the router. I can't test the HV yet because I'm staying in a corporate leased apartment and don't know the xfinity modem's user name. That keeps me from figuring out the supply address. I was thinking of guessing up to 255 times lol.

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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Jim Kovalchick » Sun Nov 20, 2016 3:49 pm

I've come to the conclusion that my unit is not obtaining an address from my router. It does not show up in network scans. The yellow light is lit on both my router and unit but green never flashes on the router. Only the unit. Any advice would be appreciated.

I suppose I can keep the unit on the chance that I can still set up control manually. Maybe more trouble for me than its worth.

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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Jim Stead » Sun Nov 20, 2016 4:01 pm

The manual suggests the IP of the supply is statically assigned. Assuming it hasn't been changed by the last owner, it should be 192.168.1.4

Andrew Seltzman
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Andrew Seltzman » Sun Nov 20, 2016 6:28 pm

The yellow light staying on is normal behavior when it's not actively communicating with anything. The Ip should be 192.168.1.4 on all supplies by default. Try connecting to it with the matlab program or typing the Ip address into the web browser.

From the manual where it says: Ethernet Supported Operating Systems: Windows 98 2ED, Windows 2000 (SP2), Windows NT (SP6), Windows XP Professional, this refers to operation of the java applet over the web server only, ex the webserver won't launch the java control applet in win7 or win10, you should be able to connect to the supply in a web browser in all operating systems though and it should bring up the webserver page, just not launch the applet for all OS.

Ethernet communication works fine across all operating systems though, and matlab or any other TCP system should be able to control the supply.
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William Kelly
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by William Kelly » Sun Nov 20, 2016 7:05 pm

Has there been any developments on the CA11 cable issue yet?
- William

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Liam David
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Liam David » Sun Nov 20, 2016 7:26 pm

I have found the failure point in my power supply. A IRFBG30 mosfet blew out on the top board and came right off the board in pieces. I'll be ordering a replacement and will see what happens. I hope it didn't cause a chain of failures, or vise versa.

Location of the blowout
Image

Image

Removed mosfet
Image

Peter Schmelcher
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Peter Schmelcher » Mon Nov 21, 2016 4:56 am

I bought 2 supplies, one works and one is dead (it even came with a toe tag). I’m considering fixing it and that is not something I undertake lightly. The circuit board is visibly burnt and some high current components are cooked. It’s a crapshoot without a schematic or phrased another way “Do you feel lucky… punk”. My impression is that it is a good modern DSP (Digital Signal Processor) design worth repairing -stay tuned.

Looking at the DXM brochure and manual I see the 300W model input voltage is 90 to 265VAC while the 600W and 1200W models input voltage is 180 to 264VAC. More input voltage equals more output power.

Our supply has a custom model suffix X3547 with nameplate input voltage of 115VAC and with output specifications implying 600W, so they are oddballs. Perhaps the 600W ratting at 115VAC is not continuous!

Given that some of these supplies have failed, caution might suggest that at 120VAC operation be restricted to 300W until more technical details are known.

-Peter

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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Andrew Seltzman » Mon Nov 21, 2016 5:33 am

I was in contact with Cliff Scapellati at Spellman when I first got a supply of this model a year ago. The custom model X3547 is designed to operate at 115vac at full power continuously. Please post pictures of the damage to the board.

I believe it is possible to test the functionality of the digital control circuitry by applying 24Vdc to the power supply fan connector without plugging in the power supply to the AC mains. The fan connector is in parallel with the main 24v bus that gets regulated down for all the digital and control logic. This should in theory power up the control board, bypassing the AC power input circuitry that may be damaged. If the control board powers up, try to run the matlab program and post the output.

If the digital circuitry is unharmed it might be possible to debug the input power electronics and repair the supply, if the digital circuitry is bad, the supply is likely beyond repair.
SAM_5451.JPG
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Rich Feldman
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Re: Spellman DXM70N600X3547 power supplies on ebay -70kV 8.5

Post by Rich Feldman » Mon Nov 21, 2016 10:13 am

Thanks for the 24 VDC jump-start tip, Andrew.

The club of DOA power supply owners includes me. Some observations and questions:

1. Top comes off w/ 9 identical screws. The small sheet metal box covering fuse and filter module is deluxe -- note welded corners.

2. Let's compare notes on fuses, in case the one I found blown is different from the type installed by Spellman. It says 10A 250 V 314. A Littelfuse 314-series fast blow ceramic body (powder filled) cartridge, like those in MWO's. I need to buy replacements, or use a plain glass 10 amp fuse before moving forward.

3. There are no obviously damaged components. Sniffing closely reveals no burned-electric-stuff smell. (The human nose is a valuable diagnostic tool.)

4. My unit's s/n is 101825126-A00370. Sticker also says REV:AW 10/13 (maybe that's the sticker rev). The remains of a hand-written annotation on the metal, near s/n sticker, says "installed 4/17/13".

5. This not-so-old model apparently isn't rare in junkyards. Here is a website with new units (rev L) for $81. Out of stock. https://www.nriparts.com/electrical/con ... wer-supply
All models are wrong; some models are useful. -- George Box

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