G'day Guys,
Ive been working on getting this LB15 lathe running after 10 years! After replacing the X axis drive, CRP board, and spindle drive its now running.
However at around 1000 rpm and under no load I keep getting an SDU alarm and on the Fanuc SDU it show LED indicating an over current.

This is confirmed by the AMP meter on the panel showing a very high current, in the red. Spindle moved by hand and feel free and normal.
I may try installing back the original SDU as i thinks its just a fuse on that.

Any ideas why its drawing so much current when running under no cutting loads?

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