FEN-21
Reference · 68679303
Configuration note: Confirm the exact installed configuration before replacement or migration.
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+86 18020776786Resolver interface · 68679303
ABB FEN-21 68679303 is a resolver interface that also provides a TTL encoder interface for compatible ABB drive systems. Its resolver connection accepts differential sine and cosine signals, while the TTL encoder connection accepts RS-422/485 differential signals on channels A, B and Z with a maximum 500 kHz signal frequency. ABB specifies resolver supply capability within an AC 4 to 12 V rms range and lists KTY84 or PTC support for the resolver thermistor input. This module must be selected from the actual installed feedback-device type, resolver or encoder wiring, supply requirement and compatible drive configuration.
For the TTL interface, ABB specifies selectable 5.5 V DC or 24 V DC encoder supply, documented current limits and a combined 3.6 W supply-power limit. The manual also lists TTL encoder emulation with a reference mark, a maximum 100 m emulation cable length and two 24 V DC digital position-latch inputs at X54. Resolver cable length is specified up to 100 m. Before installing or replacing FEN-21, confirm the feedback-device nameplate, signal type, excitation or encoder supply, pulse count, thermistor connection, latch wiring, cable length, control-unit configuration and the relevant ABB drive manual.
| Manufacturer | ABB |
|---|---|
| Model / supplied reference | FEN-21 / 68679303 |
| Product type | Resolver interface |
| Resolver input | Sine and cosine differential inputs, 2 to 7 V rms |
| Resolver voltage range | AC 4 to 12 V rms, 100 mA maximum |
| Resolver thermistor input | KTY84 or PTC |
| Resolver cable length | 100 m maximum |
| Resolver position resolution | 24 bits |
| Resolver speed resolution | 24 bits |
| TTL encoder input | RS-422/485 differential |
| TTL input channels | CH A, CH B and CH Z |
| TTL input maximum signal frequency | 500 kHz |
| TTL encoder supply | 5.5 V DC or 24 V DC selection at X301 |
| TTL supply current | 180 mA at 5.5 V; 150 mA at 24 V together with digital inputs |
| Combined TTL supply power | 3.6 W maximum |
| TTL input cable length | 30 m with 5 V encoder; 60 m with parallel 0.5 mm² supply cables; 100 m with 10 to 30 V TTL incremental encoder |
| TTL input speed range | -32768 to 32767 rpm |
| TTL input speed resolution | 0.04 rpm, 24 bits |
| TTL input position resolution | 16 M/rev, 24 bits |
| TTL input position accuracy | 4 × pulse count/rev |
| TTL input isolation | Isolated together with digital inputs |
| TTL encoder emulation | 1 to 65535 pulses/rev with reference mark |
| Emulation channels and signal | CH A, CH B and CH Z; 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 | Isolated together with encoder input |
| Digital position-latch inputs | Two inputs at X54 |
| 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-21 model, supplied reference 68679303, hardware revision and fitted interface details. Compare these with the installed equipment before ordering.
ABB documentation identifies FEN-21 as a Resolver interface. Confirm the exact installed configuration before applying it in a drive or control system.
The applicable ABB documentation identifies: Resolver interface; Resolver input with PTC/KTY support; TTL encoder connection supported; TTL encoder emulation output; Two digital latch inputs. 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-21 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-21 Resolver Interface User’s Manual. Final suitability must be verified against the exact installed unit and official documentation.
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