Drive tripping with ‘TO41’ & ‘TO42’ motor encoder feedback speed deviation?

May 2nd, 2023

Please refer to relevant contract manual for full description of these trips but here are some common causes.

Check the following:

  • Brake is lifting correctly. (Check Brake and Brake Circuit).
  • Lubricate car/counterweight guides.
  • Check for stiction in car/counterweight guides.
  • Check motor encoder wiring.
  • Possible faulty motor encoder.
  • Excessive Accel/Decel rates.
  • Check motor encoder coupling.