Elevator Forum

Are you just reading voltage to the Encoder or reading each channel to ground while slowly turning the motor to see them go high and low? If you didn’...

Do you have the correct 500 ppr digital encoder? (The small one)

Are you using the Dow heat sink compound and a torque wrench?

Otis is using DC motors on their MRLs? I did not know that, haven’t seen one. Is it brushless?

What if you just try to scale it in at inspect speed with the PPR adjustment in Motion Adjust. Not that it’s a real fix but it would be interesting to...

I’m just guessing here now but could the CPU be envolved in reading the Encoder feedback? Have you tried swapping CPUs?

You’re sure the PPR is right in Motion Adjust? Could the gov encoder coupling be slipping? Is the Encoder voltage right? What about AC ripple?

Wow, I’ll trade you a manual for that Kone tool! 😉Those speeds are way off, is the car moving 50 or 8 fpm before faulting?

The lower you set I DRV VEL the longer you will have to compare the speeds before it faults.

Does it run long enough to compare the speeds on the Motion Info screen? If motor Encoder speed doesn’t match command speed there may be a drive param...

You need to put your own voltage monitor on the car. The next time it happens you can compare the time the fault occurred to the recorded data and you...

So you got the drive back and the problem persists? You said you work for TK, why didn’t they send it to ITS? Do they not work on the newer drives?

How does it act on automatic? Same 18” then stop? What kind of drive?

This is actually kind of common with Otis drives in my experience. Mostly with OVF30 and 40 though. They seem to start getting low lin, buss undervolt...