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== Overview ==
Optical encoders made by Renco, a company that ended up being acquired by Heidenhain. There are incremental (with index) ones, as well as ones featuring UVW "hall sensor" channels for 3-phase commutation.
== Replacement Parts ==
== Online Resources ==
[https://web.archive.org/web/20061016065032/http://www.renco.com/106022.htm RENCO RM21 Modular Encoder P/N 83403-001 REV A] (Wayback Machine)
[https://download.datasheets.com/pdfs/2006/12/29/c/cs/rnc/ds/rm21%20modular%20encoder%20.pdf RENCO RM21 Modular Encoder P/N 83403-001 REV A] (PDF saved from above webpage)
[https://web.archive.org/web/20061016065118/http://www.renco.com/106029.htm RENCO RCM21 Commutation Encoder P/N 83409-001 REV A] (Wayback Machine)
[https://07f344a58728d44ae3b8-5318c1cebe9381a36fe5ed41911f264b.ssl.cf5.rackcdn.com/Eric/A/AD/RCM21%201999.pdf RENCO RCM21 Modular 2.1 Inch Commutation Encoder 77643-001 REV E]
Optical encoders made by Renco, a company that ended up being acquired by Heidenhain. There are incremental (with index) ones, as well as ones featuring UVW "hall sensor" channels for 3-phase commutation.
== Replacement Parts ==
== Online Resources ==
[https://web.archive.org/web/20061016065032/http://www.renco.com/106022.htm RENCO RM21 Modular Encoder P/N 83403-001 REV A] (Wayback Machine)
[https://download.datasheets.com/pdfs/2006/12/29/c/cs/rnc/ds/rm21%20modular%20encoder%20.pdf RENCO RM21 Modular Encoder P/N 83403-001 REV A] (PDF saved from above webpage)
[https://web.archive.org/web/20061016065118/http://www.renco.com/106029.htm RENCO RCM21 Commutation Encoder P/N 83409-001 REV A] (Wayback Machine)
[https://07f344a58728d44ae3b8-5318c1cebe9381a36fe5ed41911f264b.ssl.cf5.rackcdn.com/Eric/A/AD/RCM21%201999.pdf RENCO RCM21 Modular 2.1 Inch Commutation Encoder 77643-001 REV E]