Crown SC4020-30:
No travel!

When attempting to go either fwd. or rev. the unit travels an inch or two and then stops and fault codes 66 or 68 appear.
Any ideas out there?
  • Posted 14 Sep 2023 07:49
  • Discussion started by DaveSr
  • California, United States
Never too old or too experienced to learn more.
Showing items 1 - 5 of 5 results.
Thanks again!
  • Posted 15 Sep 2023 04:29
  • Reply by DaveSr
  • California, United States
Never too old or too experienced to learn more.
That could be the case. I would test the battery voltage at the positive terminal on each card first. One of the codes makes me think there may be a bad connection between the main controller and slave controller.
  • Posted 15 Sep 2023 04:11
  • Reply by DyslexicNerd_01
  • Wisconsin, United States
In your opinion if all the cables seem secure and the battery is amply charged, is there a possibility that one of the "traction controllers" is faulty?
  • Posted 15 Sep 2023 02:53
  • Reply by DaveSr
  • California, United States
Never too old or too experienced to learn more.
Thanks!
  • Posted 14 Sep 2023 22:50
  • Reply by DaveSr
  • California, United States
Never too old or too experienced to learn more.
Code -66: Field FET current exceeded expected current limit.

Code -68: PMT enable signal from slave controller (MRC2) to master controller (MRC1) dropped below 5 volts.

Just by looking at the codes, it seems there may be a short in the system. I would check motor cables for tightness and ensure battery voltages are correct on both the main and slave controllers.
  • Posted 14 Sep 2023 10:16
  • Reply by DyslexicNerd_01
  • Wisconsin, United States

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