Controllers & Drives

Control systems, drives, encoders, parameters and the troubleshooting order that finds faults fastest.

Entries

• Acceleration, jerk and levelling: engineering a ride that feels right
  The three motion parameters that decide ride quality, how they interact with the machine and the building, and how to tell a tuning problem from a…
• Elevator control systems: generations, feedback and a troubleshooting order
  Relay logic through microprocessor and destination dispatch, how position feedback works on each generation, and the order of checks that finds faults without swapping boards.
• Elevator drives and motors: geared, gearless, hydraulic and the faults each produces
  Traction machine types, VVVF vs resistor control, encoder and brake subsystems, and the diagnostic clues that separate a drive problem from a mechanical one.
• Hydraulic elevators: the faults that only appear when the oil is hot
  Jack, pump, valve and oil temperature - how a hydraulic unit fails differently from a traction unit, and the systematic checks that find drift, sinking and…
• Reading a controller fault list without being misled
  Fault codes report the last thing that went wrong, not the first. How to order the fault list, correlate it with load and position, and find…

Looking for a specific unit? The forum has search and 7,386 discussion threads.