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  1. masa6614

    Safety grounding in hazardous voltage DC systems ( 400VDC )

    Thank you, that ground fault device looks like what I'm looking for. The 400VDC power output is transformer isolated from the 208VAC. Also, while searching, I found that the military has a 270VDC power specification (MIL-STD-704) which ties the 270VDC return to the 28VDC and Chassis at the...
  2. masa6614

    Safety grounding in hazardous voltage DC systems ( 400VDC )

    Hello all, Can you please help or direct me to any proper grounding requirements for dealing with a 400VDC system, specifically for a motor control system. ( http://i.imgur.com/N62tmew.jpg ) So I've got a 400VDC brushless motor that needs powering, and I've purchased a AC/DC power supply to...
  3. masa6614

    Long arm length military toggle switches

    Hello, Building a control panel with a military arctic gloves operable requirement and looking at Mil-std-1472, min arm lever length for gloved operation is 38mm (1.5"). Standard Mil-dtl-3950 toggle switches have shorter arms and I can't find anything else but I know there's got to be something...
  4. masa6614

    High Current Bus bar to PCB mount Help

    i know, for the output connector I was gonna use two D-subminiature connectors with 8 #8AWG contacts ( http://www.conec.com/catalogs/c1/ioconnector/ip67-combination-d-sub-connectors/ip67-combination-d-sub-connectors-2w2-3w3-5w5-8w8.html ) to distribute the power out to various places, but to get...
  5. masa6614

    High Current Bus bar to PCB mount Help

    Thanks for the suggestions, i'm looking into these from amphenol, their RADSOK products, they seem to go up to 70 Amps. Just not sure how to get that little cylinder insert to come out of the busbar, maybe you've got to buy their busbars. http://www.amphenol-aerospace.com/new/pdf/pds-205_pcb.pdf
  6. masa6614

    High Current Bus bar to PCB mount Help

    Thanks. yeah, thats why I'm trying to find out more about that part or similar parts, where they can specify voltage/current ratings, max temp rises, etc. But I currently cant even find anything or what a part like that is called and who manufactures it, Im currently thinking of using 'power...
  7. masa6614

    High Current Bus bar to PCB mount Help

    Hi, I'm trying to get 200Amps onto a PCB, however space is somewhat limited and all the typcial connectors I see seem to be really oversized, and I just need one single connection, so I saw this online and thought it might work. However I cannot find out the part number or even the name of the...
  8. masa6614

    High Voltage DC GFCI

    Thanks, Now I'm sort of having trouble finding out what is the standard tripping current and time for this sort of GFCI. Since this is for a vehicle, reading from SAE J2344 - Guidelines for EV safety, in section 3.7 it says the resistance between the battery high voltage and the vehicle...
  9. masa6614

    High Voltage DC GFCI

    Hi, I'm wondering on how I can make or buy a Direct Current GFCI for +/- 300Vdc. Attached is a picture of my power source, the 'ground' is tied to chassis and any loads are connected between the +/- 300V lines so will see 600Vdc. I'm wondering if for a GFCI, would i be monitoring for any...
  10. masa6614

    High Voltage Bus soft-start

    Thanks for your suggestions, It's just the load will have some large capacitances to charge up to a very high voltage, and I'm afraid the power required of resistors in the path would make them huge and involve alot of heatsink space in what is a space-constrained area already. I just figured...
  11. masa6614

    High Voltage Bus soft-start

    Hi, If I was trying to use provide a soft-start to a High Voltage bus, i was thinking of PWMing the bus FET and using an inductor to limit the inrush current while the Load's input Caps are charging. I couldnt find any mosfet or igbt gate driver chips that would stay on 100% duty cycle after...

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