For AVM78E-012KRR0GN-1212, EncoderWorks can provide a custom compatible replacement focused on Gray-code SSI mapping, 12/12-bit position scaling, KR terminal-compartment wiring, and Ø10 mm servo-flange shaft fit. This model should not be treated like a clamping-flange encoder or a simple cable-output version. The key replacement boundary is SSI terminal accuracy plus correct servo-flange alignment in a flameproof installation.
The AVM78E-012KRR0GN-1212 is an explosion-proof SSI multiturn absolute rotary encoder configuration with Gray code, 12-bit singleturn resolution, 12-bit multiturn range, 10–30 VDC supply, aluminum housing execution, Ø10 mm x 20 mm solid shaft, servo flange, KR terminal compartment, and radial exit. The controller should continue reading 4096 steps per revolution across 4096 turns.
The first failure boundary is SSI word accuracy. Clock+ / Clock- and Data+ / Data- must remain true RS422 differential pairs. If terminal assignment, Gray decoding, clock pause, preset input, or counting-direction input is wrong, the SSI signal may be present while the PLC calculates the wrong absolute position.
This replacement fails when SSI communication is present, but the PLC reads the wrong position because terminal mapping, Gray-code decoding, 12/12-bit word length, monoflop timing, preset input, or counting direction does not match the original encoder. That is a signal-chain and parameter failure, not simply a sensing failure.
The second boundary is servo-flange mechanics. The Ø10 mm solid shaft, coupling, servo-flange centering, radial cable exit, and flameproof cable entry must be checked together. Shaft load and cable strain should not be used as mounting compensation.
The replacement decision should first confirm Gray SSI format, 12-bit singleturn and 12-bit multiturn mapping, KR terminal-compartment wiring, Clock/Data differential pairs, 20 ±10 µs monoflop behavior, 10–30 VDC supply, PRESET zero-set input, counting-direction input, aluminum housing execution, Ø10 mm solid-shaft fit, servo-flange mounting, radial exit clearance, shield grounding, flameproof cable entry, and shaft load. EncoderWorks treats AVM78E-012KRR0GN-1212 as an industrial encoder custom compatible solution where SSI terminal accuracy and servo-flange alignment decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | AVM78E-012KRR0GN-1212 |
| Encoder type | Explosion-proof multiturn absolute rotary encoder |
| Interface | SSI / RS422 |
| Resolution | 12-bit singleturn + 12-bit multiturn |
| Position range | 4096 steps x 4096 turns |
| Code | Gray |
| Supply voltage | 10–30 VDC |
| Transfer rate | 0.1–2 MBit/s |
| Housing execution | Aluminum |
| Shaft type | Solid shaft |
| Shaft size | Ø10 mm x 20 mm |
| Flange | Servo flange |
| Connection | KR terminal compartment |
| Exit position | Radial |
| Protection focus | ATEX / IECEx flameproof enclosure, IP66 |
| Main engineering anchor | Gray SSI and servo flange |
| Main failure boundary | Wrong terminal mapping, Gray decoding error, preset fault, flange mismatch |
