text: <s>[INST] Ultra 3000: enabled or not? Scenario: Ultra 3000 drive with enable input high but no enable output. No error codes or any other indication from drive or Ultraware that anything was wrong. Maintenance crew changed motor once and drive twice to no avail. Finally measured input voltage on input contactor and found one phase losing more than 50% voltage across contactor. Changed contactor and all was well. Tip: Always check input voltage on Ultra 3000 before performing any other troubleshooting procedures as these drives are not smart enough to know when a phase is low. You will not find this in the drive manual or in Knowledgebase. [/INST] Just curious as to whether you are monitoring your DC Bus voltage in the PLC logic? Motion planner can set it up as a real-time feedback..... \\n </s>