Max. Encoder frequency and voltage on DB9?

[Spartan117]

Hello guys,

i am wondering, what is the max. line-count for a spindle-encoder on a lathe (with max. 3000rpm)?
So i have been looking into the AcornSix-Specs-file, and there is written:
Encoder input frequency low speed** 0 - 1200 khz
Encoder input frequency high speed** 0 - 6000 khz
** Frequency of A or B channel. See parameter 323 for switching encoder filter speed

When i search for that parameter 323 it reads like they are talking about servo-motor-encoders, and not necessarily the lathe-spindle-encoders, too?

So what is the maximum input frequency of AcornSix's encoder-inputs (DB9) for spindle-encoder?


And, another question:
What is the absolute maximum input-voltage for that DB9-encoder-ports?
Are they a little bit overvoltage-tolerant, or just strictly and max. 5V, and not a single millivolt more?

Thank you,

Marc

[suntravel]

Most cheap rotary encoders are max. 100 or 200 kHz anyway.

All encoder ports have the same specs, no difference if it is used for a spindle or linear scale.

I never cared about the 5V since they are provided by Acorn Six for the encoders.

Uwe

[eng199]

Here is a similar post:
viewtopic.php?p=99383#p99383

The low speed filter is the right answer for all but obsolete, fringe use cases.

Encoders are normally powered by the AcornSix. Encoder output will not exceed its supply voltage, and the levels are typically much lower than the supply. The circuitry on board is resistant to short spikes of higher voltage that come from noise coupled to the wires.

[Spartan117]

Ah thank you! I didn't know if Hickory is the same hardware, this is why I didn't search there.

OK, so 1200kHz is maximum frequency for practical use as a spindle encoder or scale or anything else that leaves the cabinet.

And for the signals it shouldn't be more than 5.0V

I asked for the voltage, because I have an encoder that puts 6,6V out.
But then it simply doesn't fit here.

Thank you again!