I have and have had since new a 1990 MH600E2 and have had little trouble except the tool changer. For the last 10 years I have had an increasing problem of the main motor being hesitant to start, then not starting at all. I fitted a new KDV unit and that seemed to fix it, but no, after 3 machining jobs I now get an error E93 (n < n min not low during spindle run-up) and no spindle response. On the KVA unit there is the error NO RF! I would appreciate any help no techs have been able to so far.
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