a860-2005-t301
FANUC Pulse Coder A860-2005-T301
A860-2005-T301 is listed by the seller's shop under two names at once — pulse coder and servo motor rotary encoder. This page records the dual listing and what the two names mean for matching.
What A860-2005-T301 is
The shop's listing for A860-2005-T301 calls it a pulse coder and, in the same breath, a servo motor rotary encoder. Those are two names for the same office: the feedback device at the rear of a servo motor that counts the motor's rotation for the drive chain. FANUC's own vocabulary leans to pulse coder; the wider trade says encoder. The encoders family page treats them as one shelf for exactly this reason.
What matters for ordering is not the name chosen but the number held: A860-2005-T301, complete with its T301 suffix, identifies this device against the neighbouring A860 numbers that fit different motors.
Where A860-2005-T301 works
Mounted on its servo motor, the pulse coder is the loop's witness: every move the amplifier commands is checked against what this device reports. Its failure signatures are reference loss, position drift and feedback alarms — and, confusingly, occasional clean running between episodes, which is why feedback faults are so often chased through cables and connectors first.
The blog guide on matching A860 feedback parts works through the family logic — pulse coder versus encoder naming, and why the number, the motor pairing and the suffix all have to agree before a device is ordered.
One habit saves a round trip on this number: quote both labels in the same message. The motor's own rating plate and the old coder's label describe the pairing the control expects, and the desk confirms the A860-2005-T301 against both before answering — a coder confirmed against the motor it will ride on is a coder that does not come back.
Condition options for A860-2005-T301
The listing fixes what the device is; the shelf condition is stated on inquiry in the seller's normal range. Pulse coders are among the parts where a tested used unit is a rational buy — the device has no wear surface of consequence — but the rationality rests entirely on the test, which is why the condition statement and the bench run travel together for this family.
The framework is the catalogue's standard one, on the used FANUC parts page: stated condition, pre-dispatch test, the seller's warranty of 1 year on new and 3 months on used units.
Testing A860-2005-T301 before dispatch
The bench test for a pulse coder is a rotation test with its output watched: clean, continuous reporting through the turn. The test bench page describes the bench; for feedback devices the relevant point is that intermittent drop-out — the commonest real-world failure — only shows itself while the device is turning and being read, never on a shelf inspection.
A suspect device sent in for assessment gets the same rotation test through the repair desk, which is how a buyer finds out whether the fault lives in the coder, its cable, or the amplifier input behind it.
Ordering A860-2005-T301
Quote the complete number, A860-2005-T301, and the number of the motor it mounts to. If the device is being ordered against a symptom rather than a confirmed diagnosis, describe the symptom — which axis, what alarm, whether it clears and returns — and the desk will say if the pairing story holds together before anything is shipped.
Related pages
Send an inquiry
Send the part numbers you need, or the number of a unit you want assessed, with the machine each belongs to. One desk answers for the shelves and the bench.
Open the inquiry form