How to Quickly Determine Encoder Type Based on Spindle Motor Model in FANUC Systems

A860-2020-T301 Fanuc encoder working properly

Its motor working perfectly! A06B-0032-B575

FANUC systems commonly use two types of encoders built into their spindle motors: One type lacks Z-phase detection. Spindle motors using this type cannot directly perform spindle positioning; an external one-turn signal sensor is required for this function.

The other type has Z-phase detection. Spindle motors using this type can directly perform spindle positioning. Both types are commonly used in practical applications.

When performing debugging or repair testing on FANUC spindle motors, is there a way to quickly determine which type of encoder is being used?

Experienced personnel can quickly identify the encoder type using the nameplate on the FANUC spindle motor. For example, the βiI 12/10000 motor shown in the image below has the model number A06B-1447-B110#0202. The last digit of B110 in the model number indicates the encoder type; this encoder does not have Z-phase detection.

FANUC spindle motor specifications follow a naming convention. The last few digits of the model number, Bxyz, have special meanings, as shown in the image below. The last digit z corresponds to the encoder type. When z=0,1,2, the encoder type is Mi, meaning it does not have Z-phase detection. When z=3,4,5, the encoder type is MZi, meaning it has Z-phase detection.

The x and y digits in the current specification also represent the installation method and the type of output shaft, respectively. Refer to the image below for confirmation.