Brand: ABB
Category: Drives
Document Type: Manual
Language: EN
Manual for FEN-21
Uploaded: April 20, 2026, 7:47 p.m.
Manual Publish Date: 2023-07-14
The FEN-21 Resolver Interface is designed to interface with resolvers and TTL encoders, providing an output for TTL encoder emulation. It also features digital inputs for position latching. This manual covers its installation, hardware description, start-up, and fault tracing. The device is programmed via drive parameters, and its technical specifications include details on encoder input, resolver interface, and digital inputs.
Troubleshooting and error codes
| Indicator | Status | Description |
|---|---|---|
| STATUS LED | Green | OK |
| Orange | Not initialized or communication fault to control unit | |
| Red | Not in use | |
| ENC ST LED | Green | Encoder(s) OK |
| Red | TTL encoder (X51) fault | |
| Orange | TTL + encoder (X52) fault | |
| Red/orange swapping | TTL encoder fault X51 and resolver (X52) fault | |
| Red flashing | TTL encoder (X51) warning | |
| Orange flashing | Resolver (X52) warning |