1. Using current signature in this case is so useful
2. 50 HZ is rare for electrically problems (personally i never get it in such a case 20 years)
3. finding phase angle of 1X will be so useful (H-V)
4. measure vibration at many locations and match it with Infra-Red to find stator faults
Hi Orga78 , It's my first share here , as a designer i use this flex. coupling when no ability to make precision alignment as it can work well with 0.5: 0.9 mm Misalignment which is too large to use laser ,only straight edge and vernier are enough .. BUT the problem in this coupling is to fix...