FEN-31
Reference · 68978840
Configuration note: Confirm the exact installed configuration before replacement or migration.
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+86 18020776786HTL encoder interface · 68978840
ABB FEN-31 68978840 is an HTL encoder interface for compatible ABB drive systems. It provides two encoder inputs, X81 and X82, and supports channels A, B and Z. ABB documentation identifies support for differential and single-ended push-pull, open-collector and open-emitter HTL encoders, with a maximum signal frequency of 300 kHz. The module offers documented 15 V DC or 24 V DC encoder supply arrangements and also accepts an external 10 to 24 V DC supply within the stated configuration. Correct selection depends on the installed encoder technology, voltage, output circuit, cable type and compatible drive setup.
The official manual specifies a speed range from -32768 to 32767 rpm, 0.04 rpm speed resolution, 24-bit position-related values and TTL encoder emulation with a reference mark. It gives different cable-length limits for differential, single-ended and open-collector/open-emitter encoder connections, and lists two digital position-latch inputs at X84 with 24 V DC input characteristics. Before replacement or commissioning, compare the encoder nameplate and wiring with the ABB requirements, then confirm the supply selection, pulse count, cable length, shield/grounding arrangement, latch connection, installed drive control unit and firmware configuration.
| Manufacturer | ABB |
|---|---|
| Model / supplied reference | FEN-31 / 68978840 |
| Product type | HTL encoder interface |
| Encoder inputs | Two HTL encoder inputs: X81 and X82 |
| Supply options | 15 V DC ±20% or 24 V DC ±20%, maximum 200 mA |
| External supply range | 10 to 24 V DC |
| Supported channels | A, B and Z |
| Maximum signal frequency | 300 kHz |
| Signal thresholds | 0 below 3.5 V; 1 above 7.5 V |
| Supported encoder types | Differential and single-ended push-pull, open collector and open emitter HTL encoders |
| Supported cable lengths | 300 m differential; 200 m single-ended; 100 m open collector/open emitter |
| Speed range | -32768 to 32767 rpm |
| Speed resolution | 0.04 rpm, 24 bits |
| Position resolution | 16 M/rev, 24 bits |
| Position accuracy | 4 × pulse count/rev |
| Input isolation | Isolated together with digital inputs |
| TTL encoder emulation | 1 to 65535 pulses/rev with reference mark |
| Emulation channels | CH A, CH B and CH Z |
| Emulation signal | RS-422/485 differential, 500 kHz maximum |
| Maximum emulation cable length | 100 m |
| Emulation speed range | -32768 to 32767 rpm |
| Emulation position resolution | 4 × pulse count/rev |
| Emulation isolation | Electrically isolated from the HTL input and control board |
| Digital position-latch inputs | Two inputs at X84 |
| Latch-input voltage | 24 V DC ±15%, short-circuit proof |
| Latch-input thresholds | 0 below 5 V; 1 above 15 V |
| Latch-input isolation | Isolated together with TTL encoder input |
Confirm the complete installed configuration and applicable ABB documentation before replacement or migration.
Check the product nameplate for the FEN-31 model, supplied reference 68978840, hardware revision and fitted interface details. Compare these with the installed equipment before ordering.
ABB documentation identifies FEN-31 as a HTL encoder interface. Confirm the exact installed configuration before applying it in a drive or control system.
The applicable ABB documentation identifies: HTL encoder interface; Two HTL encoder inputs: X81 and X82; 15 V DC ±20% or ±20%, maximum 200 mA; 10 to ; A, B and Z. Final suitability depends on the exact installed version and configuration.
Do not assume interchangeability from a similar model. Check the complete nameplate, drive or control-unit version, interfaces, wiring and application before replacement.
Use FEN-31 only in an ABB drive or control configuration supported by the applicable ABB documentation and the installed equipment configuration.
Follow the ABB manual for the exact version. Isolate power and ensure that mounting, connectors, wiring, shielding and parameter settings are checked by qualified personnel.
The fixed procurement-status panel is retained from the approved template. Provide quantity and a clear nameplate photo so the offered configuration and dispatch details can be confirmed.
The fixed procurement-status panel is retained from the approved template. The quotation will confirm the offered unit condition and applicable warranty terms.
The unit will be checked and protected against static electricity, moisture and impact. Packaging, courier and dispatch details will be confirmed for the order destination.
Send the model, complete part number, quantity, destination and nameplate photo. We will verify identification details before confirming availability and lead time.
Technical information is based on ABB FEN-31 HTL Encoder Interface User’s Manual. Final suitability must be verified against the exact installed unit and official documentation.
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