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UMC Cable Failure

Discussion in 'Model S: Battery & Charging' started by TTT, Sep 10, 2015.

  1. TTT

    TTT Member

    Joined:
    Jul 10, 2014
    Messages:
    342
    Location:
    San Diego
    I've been charging my MS at home using the UMC for about a year now without any issues and the SvC checked the cable during the annual inspection, but a few days ago charging was interrupted and the car warned that there was a charge cable failure. I had to unplug the UMC from the wall and replug it as well as replug it into the car. All seems to be fine now, but I was wondering if this is anything to be concernd about or maybe the unseasonably hot weather may have had a role in this issue.
     
  2. Cyclone

    Cyclone Active Member

    Joined:
    Jan 12, 2015
    Messages:
    4,394
    Location:
    Charlotte, NC
    I had the exact same problem occur the day before yesterday. It wasn't unseasonably warm, but I wasn't worried about it either. If it happens again, I plan to ask my SvC about it. My car goes in next week anyways and they typically do a customary check of the UMC, so I would probably be set either way.
     
  3. Only Trons

    Only Trons Member

    Joined:
    Jun 22, 2013
    Messages:
    261
    Location:
    Northern Virginia
    Well, I'm on my fourth UMC now. The first one had a bent retainer catch on the end that plugs into the 14-50 adapter. The second and third both started having intermittent problems....sometimes the car would click numerous times and then either fail to start charging (red ring) or it might start charging. Other times it would start charging but them immediately drop the amps from 40 to 30. Both times the local SC checked the UMC and provided a replacement.

    I keep one UMC in my garage plugged in at all times. It is supported with a hook and hose reel so there is no strain on the cable. This is the one which has failed. I keep another in my car for travel purposes....it has been used only a few times but I've never had a problem with it.
     
  4. UberEV1

    UberEV1 Member

    Joined:
    Mar 9, 2014
    Messages:
    258
    Location:
    San Jose, CA
    One thing to check is the temperature of the UMC cable between the plug and the controller. I had my UMC replaced after that upstream portion of the cable measured at 160oF (71oC). After replacing, it now runs at 105oF (40oC). Here is a link to the data I collected showing on the bad UMC cable . . .

    http://www.teslamotorsclub.com/showthread.php/16889-Hot-UMC-Cable/page2

    On the fun side of things, this little experiment revealed that I could buy a nice handheld pyrometer-type temperature measurement device (with laser pointer) for less than $20 on Amazon - a nice tool to have lying around for quick, easy surface measurements.
     
  5. Cyclone

    Cyclone Active Member

    Joined:
    Jan 12, 2015
    Messages:
    4,394
    Location:
    Charlotte, NC
    Any specifically recommended product at Amazon?
     
  6. UberEV1

    UberEV1 Member

    Joined:
    Mar 9, 2014
    Messages:
    258
    Location:
    San Jose, CA
    Not sure which is best, but I got the Nubee Nub8500H and have been happy with its ease of use and max temp feature (makes measuring the cable temp easy since you're looking for a max anyway.
     

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