Power in Flux
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Thread: Curtis 1238 programming

              
   
   
  1. #11
    Status-free and luvin' it
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    Thanks Noah, I'll get one on order. Since I'm out of town next week for work anyway the delay doesn't even bug me Actually 4 years into this project nothing is getting to me at this point LOL.
    Mike Pipes
    - Currently under analysis paralysis.

  2. #12
    Empulse R #24 frodus's Avatar
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    Quote Originally Posted by podolefsky View Post
    That sounds like the contactor. They always buzz like that. It's the PWM.

    As to the cycling, a 12V contactor is going to be problematic with anything above 48V. The duty cycle is too short for stable holding. Get a 48V coil contactor and set the duty cycle to 45% (max for a 48V LEV200 is 52.8V, and if your pack is freshly charged it's going to be up around 110-115V, thus 45% ~ 50V).
    This.

    12v is too low. Hpevs used to use 24v coils and moved to 48v for this issue.
    Travis

  3. #13
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    Ok. Got another contactor on order. Dang, that is the last piece keeping me from spinning the wheel.
    Mike Pipes
    - Currently under analysis paralysis.

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  5. #14
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    Back in town for just a day this weekend, long enough for me to get the new contactor installed.

    I also wired in a push button and relay that activates the brake wiper when the ET- is pulled back in the reverse direction. Pushing the button (momentary) while pulling the throttle back turns off the relay thus feeding 0-5v to the throttle wiper while also sending 12v to the Reverse input on the controller.

    Now my only issue is the External Output is slightly over at 220mA but I might be able to resolve this by powering the push button LED from 12v auxiliary instead of Curtis 12v logic.

    This sound is music to my ears after 4 years! That carbon swing arm really amplifies the sound.

    https://youtu.be/q8mdmuyMJS0
    Mike Pipes
    - Currently under analysis paralysis.

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