You are viewing a new Avtron M285 SMARTach rotary pulse generator. This is Base PPR 48, Left Option -LP1. It is a Revision K.

This has no box since it was bulk packed in bubble wrap , but it will be well packaged for shipment. This also comes with the motor disc P/N B23490-2.

This is new old stock from an old parts warehouse that was air conditioned. Shipping to you will be $50 and it will go by FedEx Ground or USPS Ground Advantage (sellers choice).

Manufacturer Description:

The Avtron Model M285 SMARTachTM (patents #5,502,376, #5,608,277, and #5,545,985) is an incremental encoder (also known as tachometer or rotary pulse generator), allowing operation down to zero RPM. It provides a specific number of electrical Pulses Per Revolution (PPR) that are proportional to a shaft’s revolution. The M285 SMARTach is a bearingless, couplingless, modular design, providing unequaled reliability, and mechanical performance.

The M285 fits AC and DC motors with an 8.5" C (FC / 180) Face. Both end-of-shaft and through shaft mountings are accommodated.

The M285 Encoder consists of three parts: a rotor, a stator housing, and removable sensor module. These precision machined parts mount to the accessory end of a motor that conforms to 1987 NEMA MG 1-11.68 for Type FC Face Mounting. See Mechanical Specifications (page 2). After mounting, a simple, no-measurement gapping sequence precisely sets the sensor-rotor gap to factory specifications.

An Avtron M285 SMARTach is equipped with one or two M284 sensor modules. Each module has a two-phase output (A,B) 90° out of phase, with complements (A–,B–), (A Quad B Output). A marker pulse with complement (Z,Z–) is available as an option. An optional 4- output housing is available.

Output resolution is determined by the rotor’s base PPR (pulses per revolution), times an M284 sensor multiplier. The M284 sensor module can provide: the base PPR, 1/2 the base PPR, or double the base PPR (see table 1-1). With two sensor modules, the same encoder can provide two different PPRs from a given rotor at the same time. Only one rotor per M285 is possible. Sensors and rotors are not interchangeable between M285 units with different base PPRs.

An instruction book can be found at the following link:

https://www.nidec-avtronencoders.com/wp-content/uploads/2022/08/m285man.pdf