Timeline for Are there Multi-Turn Absolute Encoders that Store the Number of Turns in Non-Volatile Manner?
Current License: CC BY-SA 4.0
9 events
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| Sep 27, 2019 at 1:06 | comment | added | Cherry | After reading Marko's & Jeroen's answers, I had a hunch that the encoder I tested needed a battery backup to retain the ability to measure the number of revolutions. I confirmed this by emailing CUI yesterday (the maker of the encoder I tested). As for answering my stackexchange question itself, I believe Marko gave the most informative answer by listing the main different types of absolute multi-turn encoders, and how they "retain their revolution-count measuring ability". I also thank @WhatRoughBeast for giving more insightful detail as to what happens when power is applied vs not applied. | |
| Sep 27, 2019 at 0:59 | vote | accept | Cherry | ||
| Sep 26, 2019 at 14:24 | comment | added | WhatRoughBeast | @Huisman - There are two different functions being performed - measurement and readout. The measurement function is self-powered, in that a very small amount of power is required to move the gears and this is provided by the shaft connection. The readout function is electronic/optical, and this requires external power to operate. So with no power the unit functions "normally", recording the current position of the shaft. When power is applied, the operation of the gears is unaffected, but their position is read out and reported. | |
| Sep 26, 2019 at 7:45 | comment | added | Marko Buršič | As OEM integrator I can confirm that Sick encoder would do this. As a CNC service, I can only say that disconnecting a Fanuc encoder or battery drain it will loose the position. Those battery powered are rather proprietary, never used as OEM. What is your project? | |
| Sep 26, 2019 at 7:25 | comment | added | Cherry | @Marko Buršič Just to confirm for both the Asian-style (with battery) and European-style encoders (with gears): if the encoder's position AND number of revolutions was changed while the encoder was powered off, will the encoder be able to remember these two values once it is turned on again? | |
| Sep 26, 2019 at 6:56 | comment | added | Marko Buršič | They are not self powered, they just do nothing when powered off, but once powered on they send the true position even if they were moved while powered off. | |
| Sep 26, 2019 at 6:53 | history | edited | Marko Buršič | CC BY-SA 4.0 |
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| Sep 26, 2019 at 6:44 | comment | added | Huisman | Such encoders don't need power for counting position. Do you mean, there are self-powered or not using power at all? | |
| Sep 26, 2019 at 6:32 | history | answered | Marko Buršič | CC BY-SA 4.0 |