This is similar to the service post found here:
However in this instance, isolating the Slew Drive by disconnecting hoist drive and trolley drive from the CAN system did not help. Checked for 60ohms on the CAN Hi and CAN Lo . This should confirm that the jumpers in both of the erection jumper plugs are there and correct. Found CANOpen card was not operating correctly.
Unplugged and plugged back in the CANOpen card and plug. Unplug and replug the memory stick back in. No change. Replace memory stick and drive came back up on line.













