Hi All

Thank you all for your help.
From your comments, I obviously need to give you more information.
This is a new setup. I bought the machine with a Gecko G540 but the connectors were corroded, so after hours of trying to sort it out decided to start afresh.
The cabinet contains:
3 off DM860I stepper drives.
1 ST-V2 Bob
1 UC100 motion controller
1 60 volt power supply
1 24 volt power supply
1 5 volt power supply
Control software is UCCNC

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Click image for larger version.  Name: Screenshot of UCCNC (X axis).png  Views: 906  Size: 280.8 KB  ID: 29975
Please excuse untidy wiring just want to get it working first.
If it seems correct can someone talk me through fault finding? I do have a basic scope.