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Sabertooth 2x32 battery in parallel

Discussion in 'Electronic and hardware generally' started by gigi, Jul 14, 2017.

  1. gigi

    gigi Active Member

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    I've a problem with my sabertooth 2x32, zyt90-155-12 40A peak and PSU AWF 11DC 1400W 90A
    Power supply always shut down in peak protection. I try what dimension engineryng suggest,....voltage clamp to assorb regenerative current putting 1, then 2 then 3 and also 4 resistor in parallel from P1 to B+ ( at the moment I'm testing with only one motor in M1), but problem not solved.
    Resitors are these one https://www.digikey.com/products/en...t=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25 the same that dimension engineryng supply with the 2x32 card

    I read that another solution should be to put a battery in parallel with a power supply unit, connect the positives together and the negatives together. For do this I need some type of re-chargeable battery like lead acid or lithium. It must be equal voltage to my PSU, and at least 12Ah or more.
    Probably stupid question but I would avoid to make demage.... The correct connection for this solution is put BATTERY+ and PSU+ to B+ of sabertooth and BATTERY- and PSU- to B- of sabertooth?
    Nothing else? diode, resistor? battery charged?
    The dip switch 3 must be set in battery (off) or power supply (on) mode? other setting in describe software?
    Thanks for your support

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    Last edited: Jul 14, 2017
    gigi, Jul 14, 2017
    #1
  2. gigi

    gigi Active Member

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    I wait your support. If should be necessary a diode please specify exactly wich diode and the connections
    thanks
    gigi
    gigi, Jul 17, 2017
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  3. Pit

    Pit - - - - - - - - - - - - - - - - Gold Contributor

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    all efforts are running out, you have just to use other PSU's like the HP DL 360 G5 or dps 600 bp...
    Pit, Jul 18, 2017
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  4. gigi

    gigi Active Member

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    gigi, Jul 18, 2017
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  5. gigi

    gigi Active Member

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    gigi, Jul 18, 2017
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  6. SilentChill

    SilentChill Problem Maker

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    SilentChill, Jul 18, 2017
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  7. gigi

    gigi Active Member

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    Hi silentchili!
    Yes one psu to saber

    I Tried 3 solution:
    1) put first 1 than 2 than 3 and finally 4 resistor like dimensionenginering suggest but the problem not fix. I don't know how calculate the right resistor.

    2) put a car battery in parallel and the problem fortunatly fixed. So I cn confirm that if I use my psu and a car battery in parallel the problem fiix. But At this point my problem is that I'm a newbie and I don't know how set this configuration and avoid dangerous problem. If the battery is connect in parallel with psu it absorbe the regenerative current. But does it also receive charging current? if yes how avoid that battery go in overcharger with the risk of explosion?diode? If yes wich one and how connect?

    3)use switching pus instead server psu. I've 600-12 50A switching psu, than I connect to sabertooth and only one motor to it. with switching psu no problem of peak protection. it works perfectly. But as you know if I have one sabertooth 2x32 and to motors zyt90 40A peak each one switching psu 12v 50A is not enough. I need to use 2 of this psu in parallel to obtain 12V 100A . In this case my problem is...how put 2 of these switching psu in parallel properly avoiding the risk of damage. diode? resistor? if yes wich one and how connect?
    gigi, Jul 18, 2017
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  8. SilentChill

    SilentChill Problem Maker

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    Just wire them in parallel there is no need to do anything else. I have 6 x switching led psu's all wired up in parallel. There will be no back feed the resistors will take that
    SilentChill, Jul 18, 2017
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  9. gigi

    gigi Active Member

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    Yes I read in your thread that you use 2 switching psu in parallel.
    But are you sure that it's not necessary any diode ore somethong else.?
    Many people says that is very important that the 2 psu have exactly the same output voltage (mine have a trimmer) like this one http://www.ebay.com/itm/ALIMENTATOR...641573?hash=item4ad4da13a5:g:6OIAAOxyi-ZTaLCL
    But some people say that it's dangerous put them in parallel
    gigi, Jul 18, 2017
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  10. SilentChill

    SilentChill Problem Maker

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    I have had 6 x server psu's in parallel with no issues and I have now the 6 x led psu's all set manually to 13.8v so they probably are not all exactly the same and I have had no issues. The only danger someone mentioned was me over charging the battery which you dont have to worry about.
    SilentChill, Jul 18, 2017
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  11. SilentChill

    SilentChill Problem Maker

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    Just wire the + to + on both psus and - to - and then from each psu put the 4 wires to your sabertooth 2 x - and 2 x +. They will share the load between the 2 psu's it works tried and tested ;)
    • Informative Informative x 2
    SilentChill, Jul 18, 2017
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  12. gigi

    gigi Active Member

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    Thanks I'will try .In case of an explosion I will say that you are the commander of the attack:grin:grin
    • Funny Funny x 1
    gigi, Jul 19, 2017
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  13. SilentChill

    SilentChill Problem Maker

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    As long as you wire it up correcy there will be no probs
    SilentChill, Jul 19, 2017
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  14. baykah

    baykah Active Member

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    To solve this problem, I added a 100A Diode between the PSU & the sabertooth 2x32 + a big big capacitor47 000 µF I think (not sure)

    Of course, I have the regenerative resistor config also
    • Informative Informative x 1
    baykah, Jul 20, 2017
    #14