Based on field service reports and Siemens technical documentation, the following are the most common root causes:
Manually check the axis for smooth movement. If the error only occurs at specific speeds or positions, look for mechanical binding or lack of lubrication. simodrive 611 error 607
Error 6 on Simodrive after changed motor bearings - SiePortal - Siemens Based on field service reports and Siemens technical