Help with turret encoder of Baruffaldi Turret TOE100 to retrofit old CNC

[Jerico]

I may have repaired a similar encoder (at least I recognise the name of the turret) before now for another forum guest. Anyway, the first thing I'd look at is if there's a pull-up on the inputs to the PLC. Gimme a sec, let's see if I have some old photos...

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If your encoder looks like one of these - essentially, unless there's a common-mode failure (e.g. supply line to the PCB) then each of the 6 signals is independent from the other - and it's highly improbable that the entire encoder has failed. I'd have to really dig around for any notes I may have but believe the encoder outputs are open-collector. If the PLC doesn't provide a pull-up, or cannot be configured to switch-in a pull-up then try with a 1k-10k resistor between DC+ and the output.

For information - the failure mode experienced by this encoder - twice over two years - was the failure of the photo-diode on the encoder board. Last pass I replaced all diodes.

I don't think my encoder looks like that. The encoder looks like this.



However, I'll consider what you've said. Thank you!

Edit: If you're pertaining to opening the inside of the encoder, I might check it later.

[Doddy]

I don't think my encoder looks like that. The encoder looks like this.



However, I'll consider what you've said. Thank you!

Edit: If you're pertaining to opening the inside of the encoder, I might check it later.

Actually - that's very interesting - that looks very much like the common-or-garden quadrature encoder - can you post details of the label? (I've tried magnifying and angling the laptop, but can't see enough detail). But I might be heading down a rabbit-hole here. But a quick image of the label....

Edit: Still think testing pull ups is a quick and easy test.

[Jerico]

Actually - that's very interesting - that looks very much like the common-or-garden quadrature encoder - can you post details of the label? (I've tried magnifying and angling the laptop, but can't see enough detail). But I might be heading down a rabbit-hole here. But a quick image of the label....

Edit: Still think testing pull ups is a quick and easy test.

The thing is the photo I used is just a generic photo of what mine looked like. Since the CNC and the tool turret with it are around 20+ years old, someone might have removed the label. Some things are for sure: (1) It is an 8-Position Absolute Encoder; (2) It looks like the photo I attached; (3) I think it is the original encoder from the Baruffaldi TOE-100 Turret (since the wire colors and how it is assembled to the turret fits the TOE-100 manual).

I'll drop an update after testing pull-ups. Thanks for that.

[Muzzer]

The position switch on the hydraulic turret on my Tree lathe looks like this visually but it's actually an "8 position rotary switch" by Sanyo. I'm pretty sure mine actually has 8 reed switches in it, as it beeps out in either direction with a DVM. The giveaway is that it has 9 wires.