I was hoping for some insight into very intermittent yet continuous entrapments on 2 out of 3 units. Entrapments always occur between floors with a drive unit fault 99. Fault 36 always proceeds fault 99.

Both problem units have had the tachs replaced and calibrated. New drive setups done. Pulse scale is within spec +/- 5 of 250.

All voltages and contacts have been checked, yet I’m thinking it must be a flakey contact or a voltage value slightly off. Or pulse board?

Any thoughts would be greatly appreciated.