Home Forums General Discussion Technical Questions Persistent Vibration in Mitsubishi Lift

My initial thought is encoder couplings and encoders. I'm amazed that was not first on the list. Second, if problem still persists, would be to hire a competent troubleshooting company to determine if it's mechanical or electrical by utilizing an oscilloscope and some electrical testing equipment hooked up to the drive. It's very simple to determine if the drive output is consistent with the proper tools. To me it sounds like a bad regen drive or a bad braking resistor. Twisting cables wouldn't cause a drive to shut down at high speed (they could've been un-twisted and properly re-tensioned without replacement) and neither would a bad bearing in any position besides possibly a governor and only if it has a gov encoder. Otherwise swapping the deflector, drive sheave and hoist motor machining/bearing was a really expensive guess. I'd call my company if I were you. Stop spending money until you find the right people for the job !