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contactors ?

Discussion in 'Charging Standards and Infrastructure' started by montgom626, Jan 31, 2013.

  1. montgom626

    montgom626 Active Member

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    I have read the term "contactors". What is a contactor?
     
  2. Kevin Sharpe

    Kevin Sharpe Active Member

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    "A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings."

    Contactor - Wikipedia, the free encyclopedia
     
  3. montgom626

    montgom626 Active Member

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    Where is it located in the MS?
     
  4. wycolo

    wycolo Active Member

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    > Where is it located in the MS? [montgom626]

    NO USER SERVICEABLE PARTS INSIDE :frown:
    --
     
  5. vcor

    vcor Member

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    My strong impression is it's in the battery pack itself (from looking at patents). The pack itself has the ability to detect a number of harmful events, such as a serious crash, and immediately disconnect the pack's power from the external connections.
     
  6. montgom626

    montgom626 Active Member

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    Never even crossed my mind. Just want to know more about my soon to arrive MS. Thanks for the warning.
     
  7. Doug_G

    Doug_G Lead Moderator

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    In other words, "It's a big-ass relay."
     
  8. FlasherZ

    FlasherZ Sig Model S + Sig Model X + Model 3 Resv

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    Cutting that emergency loop of wire beneath the frunk lid with the fireman hat sticker attached to it will disable the traction battery pack contactor. Follow the wires. :)
     
  9. montgom626

    montgom626 Active Member

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    Nice idea, but not going to happen!!!!!!!!!!!!! :smile:
     
  10. wycolo

    wycolo Active Member

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    > Follow the wires. [FlasherZ]

    Or the sound. Have someone shift thru PRND to get the contactor clunking while you probe around with a mechanic's stethoscope.
    --
     
  11. TEG

    TEG TMC Moderator

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    Note, both EVSE (e.g., HPC or UMC) and car tend to have their own contactors for safety reasons.
    The EVSE doesn't provide AC power to the vehicle charging system until it gets a "ready to go" signal from the car and then it engages the charging contactor within the EVSE.
    The car has a contactor to keep the battery/pack isolated until it is needed to be hooked up for charging or driving. When you plug in an EVSE and start charging it should activate contactors in both the EVSE and in the car, to connect the EVSE (AC) to the charger, and the charger to the (DC) battery pack.

    If the car gets in a bad accident the contactor is supposed to dis-engage so there are no dangerous high voltages presenting anymore outside of the battery pack.
     
  12. montgom626

    montgom626 Active Member

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    I assume the stethoscope is plastic? ;-)
     
  13. GSP

    GSP Member

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    The contactors have to be inside the battery. All EVs, and HEVs, are designed this way. Otherwise, the battery high voltage terminals could not be de-energized to make it safe to handle, ship, and connect/disconnect.

    GSP
     

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