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My VFD/inverter is showing an er.04 er 04 on the display when the spindle starts spinning
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The Er.04 (if you are using the YL VFD), generally refers to the ramping up and ramping down of the spindle, but it can be a result of a short circuit between the VFD and the spindle. You can increase the time the spindle accelerates (ramps up to the set rpm/frequency). Additional Information:
