CACB: Communication Error MCM

To avoid serious injury follow all warnings and instructions in the manual. Wear appropriate personal protective equipment.

  • CAN cables carry 24 V dc power and communicaton between modules.  A cross threaded CAN cable connector may cause problems with communication and/or power to modules.  Carefully check for cross threaded CAN connections on the MCM and on other modules.
  • Green light on each module should be lit.  If green light is not lit, check to make sure each CAN cable connection is not cross threaded and is tight.
  • Check the CAN cables running between GCA modules.  Check for cross threading and tighten if needed.  If the problem still persists, grasp the cable near the connector, move it around, and watch the flashing yellow light on the GCA modules.  If the yellow light stops flashing, replace the CAN cable.
  • The ADM2 needs to make sure both MCMs have a "side" if they are both the same side, it will set one to be the other side and lose communication shortly. If this error occurs and gets cleared after acknowledging, attempt to jog both motors individually. If motors do not move, cycle power and try again.