Chapter 6. Suggestions and Error Corrections for Hybrid Servo DrivesC | VFD-VJ   
 
6-14 
6-8 Maintenance of Coupling 
It is recommended that you visually check the condition of the coupling at least once a year, and 
pay special attention to the condition of the wye junction on the couplings. 
Since the passive bearing and the active bearing of the mechanical bearings goes up and down 
while the hybrid servo drive runs, verify if the couplings are aligned and realign the couplings if 
necessary.  
Verify the parts of the couplings periodically such as if the metal parts on both sides and the 
middle plastic sleeve are deformed or damaged. Also visually verify if the screws are loose.