encoder wiring

[BruceDownunder]

I have an encoder --Litton from california Part No. 720B1660-312-5-4  with four wires --Red;black;white;blue  . This is on the back side of a teletex printer which I manager to catch . I would like to know the connections of these coloured wires --maybe battery / meter (for rpm readout)

Thanks in advance

brucedownunder

[Chagrin]

Any labeling of the wires, such as A, B, Z, etc.?

[anthony]

Hi bruce

you might want to look at oatleyelectonics.com in nsw kit no. k117 optical tachometer $28.just ordered 1 myself, hope it will do the job.

hows the f&p coming along?

cheers anthony

[Opera House]

Typically on a printer they have a pulse out and no AB for direction. Likely wires are power(red), common (black), blue and white are encoder.  One of these may be a once per rev (home) that you may not be able to detect.  First apply 5V to the power wires and see if there is output on either signal wire.  You may need a 10K ohm resistor to the positive if the output is open collector.  If nothing on either, try 12V.  This could blow it out if the electronics is TTL but what do you have to loose.  Many of these old ones had an incandesent lamp and it may be burnt out.  If you get output on both it may be A and inverted A, or quad AB.

[RatOmeter]

Every 4 lead encoder I've used had 2 wires for power and return, and a wire each for the A and B quadrature pair.

I agree that the Red and Black wires are likely to be the power lead, but if this is a large, industrial grade encoder, it may want anywhere from 5 to 24 VDC with the output being open-collector to TTL.  If I'm wrong about it having an AB quadrature output, then the two output leads could be a differential output, kinda like RS-422.

Good luck, Bruce.

[BruceDownunder]

Thanks for the input guys.  

Anthony, The F&P is on hold ,waiting for a time window to start building the mast. What this is about is the start of a new indoor control and "look" box that I am making. I hope to have all the necessary meters,including an rpm circular meter in it . I have a hand held tacho (optical) ,if that's what oatley are selling -but will have a look later .

The encoder thing is just a "wet weather" test bench job I am fiddling with , but of course will be valuable in deciding on a more permanent one for the mill.

As far as the F&P set-up, well, I'm still working on a twin stator/rotor one with offsetting one stator to leesen cogging --it can be done .

Anyone interested in Hall sensor triggers should try for discarded main frame computer gear and very large printers. They have very nice dc brushless motors with tacho/Encoders on the back end. Some have digital read-out displays ,so with a bit of fiddling you got yourself a ready built Tacho with display.

Thank everyone for the help

Bruce