When a new gearless car shakes or stops off-level, people blame the inverter first. Often the culprit is feedback. A mismatched or poorly installed device from the elevator encoder supplier will waste days of commissioning.

Know what you are buying: incremental units on many geared induction setups; absolute or Sin-Cos feedback on a lot of PMSM gearless machines; sometimes magnetic tape as a supplement. The model must match the inverter firmware — not just “fit the shaft.”

Field failures are frequently mechanical: oil on the encoder, cable pinched in the hoistway, coupling set screws left loose. Shielding and max cable length are not footnotes. Stock a spare for each gearless elevator encoder family you install; waiting on air freight for one sensor is an ugly callback.

RITECH pairs feedback devices with MONADRIVE and related platforms on OEM builds. If you are integrating your own brand, send us the drive model before you order encoders from three different catalogs.