Hello,

I hope someone out there has some ideas on a problem we are having on a newly modernized duplex. The OEM is Otis/Beckett using an overhead 22CT machine roped 1:1, no deflector. Speed is 350 Ft/min, Capacity 2500 LBS, empty car weight 3300 LBS, there are 4 5/8" ropes and 22 stops, whisper flex compensation. The controller we installed is MCE M4000 using the KEB drive and new Reuland motor. We retained the machine. We replaced hoist ropes, compensation (was chain), slipper guides with Elsco rollers on the car and cwt.

The issue we are having is a vibration that you can feel in your feet throughout the travel of the car. It seems like rope vibration so we isolated the hitch plate but it made no difference. We checked roller guides but we cannot figure out the source. The machine seems ok and we tried adjusting drive gains but again no difference. Both cars have the same problem. When there is 500 LBS or more in the car there is a dramatic improvement. The sling is made out of formed steel similar to Dover design.

Any ideas would be welcome!