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  1. #21
    Engineer
    Join Date
    Dec 2014
    Location
    Canada
    Posts
    498
    I have upgraded to a 40Amp Automotive Relay
    works great.. hope it stays that way
    Attached Images Attached Images

  2. #22
    Me too after having exactly the same problem as Adam. Only gets lukewarm even when working hard. No problem with the wires to the heat bed either.

  3. #23
    i will have to look into that... if nothing more than to get rid of the screw clamps and go to crimps

  4. #24
    Technician N5QM's Avatar
    Join Date
    Jan 2015
    Location
    Little Rock, AR
    Posts
    97
    I created this to support the bundle of cables coming from the PCB. It attaches to the wooden part below the heater PCB.

    http://www.thingiverse.com/thing:702335

    I figure it might help keep those wires from breaking loose on the PCB side.

  5. #25
    Could someone post a wiring diagram for using one of those automotive relays?

  6. #26
    Engineer-in-Training beerdart's Avatar
    Join Date
    Feb 2014
    Location
    CT
    Posts
    345
    See attached.
    Quote Originally Posted by DaChank View Post
    Could someone post a wiring diagram for using one of those automotive relays?
    Attached Images Attached Images

  7. #27
    ... Got a 30A auto relay... All I could find... It melted wires today... Gonna get a 40A to hopefully fix it

  8. #28
    Being an rc guy we usually use the 5 second rule.. my bed wires are at about 1 second.. gonna replace with 14wag silicone wire this week

  9. #29
    Quote Originally Posted by paintz2007 View Post
    Being an rc guy we usually use the 5 second rule.. my bed wires are at about 1 second.. gonna replace with 14wag silicone wire this week

    more detail please?

  10. #30
    Engineer-in-Training
    Join Date
    Feb 2015
    Posts
    211
    The relays aren't what is causing these wires to melt.

    A poor connection is what is causing it.

    When you have a poor connection it creates resistance, resistance creates heat, heat causes the connection to become worse creating more resistance and more heat until you have a failure.

    Quote Originally Posted by sniffle View Post
    ... Got a 30A auto relay... All I could find... It melted wires today... Gonna get a 40A to hopefully fix it

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