First see if you can find any markings indicating a manufacturer, if so search
for them on the web and look for a similar encoder, they might have the wiring
published online. If that doesn't work, I would ohm between each color and
black to make sure none are tied together, if the are, that's probably your
power wire. Red & black could be + and green & black could be -. Many sensors
used in industrial equipment use brown as + and blue as -. Also ohm each wire
to the encoder case, also check shield to case. Your red & black pair could be
power and the green could be a ground. If the red and black are not tied
together(ohms more than 30 or so), try 5v on them. If you get the power right,
channels A and B will read an AC voltage when you turn the encoder, Index will
only get a quick spike once per rev.
For fear of burning up something, If you can't find the manufacturer's name, I
would look at encoder wiring diagrams on some of the more popular encoder
brands. I know Automationdirect.com has encoders with online documentation but
I don't know if wiring color codes are common for other manufacturers.
HTH
Roger Neal
----- Original Message -----
From: richard harris
To: Enhanced Machine Controller (EMC)
Sent: Friday, August 03, 2007 1:43 AM
Subject: [Emc-users] OT Encoder Question
Hello,
First let me apologize for this off topic question, but I exhausted all the
responses google provided.
I have a Hardinge lathe with an unknown encoder mounted to the spindle. The
encoder has 5 sets of wires. All are twisted pair, one set is wrapped in red
foil and is a red wire and a black wire I assume this is the power. One set is
wrapped in green foil, with a green wire and a black wire. The last three sets
are in blue foil, wire colors are; brown/black, blue/black, yellow/black. I
can speculate that the blue foil are the channel where the colored wire is the
channel and the black is the inverse. That leaves the rather dubious green foil
set of wires.
Any ideas, before I wire and hope?
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