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Thanks Ross, and following some more discussions from the RCA session we may have closure. In the interest of win-win I will share what we learned. It is dissapointing that this scenario and solution where not discussed prior to job planning and execution. The tubular belt is flat at both...

We bought it from the belt supplier. Also, since my initial thread we have had a root cause analysis session with both the belt supplier and the conveyor supplier. During this review, it was commented that a certain "run in" time was normal.

We are operating a tubular belt conveyor about 400 meters lenght between feed and discharge end. Three weeks ago, we changed the tube (belt). Much problems the first week with the tube turning radially and tripping the sensors. After a break-in preiod the belt was put on line and ran fine...

I failed to mention that the steam heating is done initially at the beginning of a batch to elevate the temperature and start the reaction.

We are operating a jacketed vessel (carbon steel construction) which operates both exo-thermic during a reaction phase and then the reactor is cooled between batches. The pitting is occurring on the vessel surface. Nitrogen is used to pad the air space during the draining and filling steps...

The drive is a Square D, Altivar 66. Internally, I am hearing things similar to what the three replies have already stated. It has something to do with feedback that the VFD receives knowing where the rotating magnetic field is (stator) with respect to the rotor.

We are attempting to drive a solid bowl centrifuge (very high wk-2 with normal 7 to 10 minute wind up time when starting accross the ine). Motor is 100 HP. any experience and learnings. We are having trouble with the inverter faulting out due to braking issues.