Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: comet on December 04, 2007, 04:53:14 PM
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Hi,
I have just bought 3 HP ENCODER QEDS-7148 encoders
off ebay:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=150177860536
there are only three wires coming from them,does anyone know how to wire them for
quadralature? I have tried getting info from the vendor but they appear to be
ignoring my emails!
regards
Tony
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I have done some searching and it looks like these encoders may not be any use to you, seems they are low speed encoders meant for a max of 300RPM.
See here http://books.google.com/books?id=jlvlZrAb92oC&pg=PA269&lpg=PA269&dq=%22qeds+7148%22+encoders&source=web&ots=yvQ7OkC7YO&sig=_-Sa7fqXE4lHTiw_u31oCOz7shg
Hood
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Hood,
Thanks for taking time.
yes I found that link before,but I was intending on striping them and modifying them.
or probably using them as mpg encoders.They were cheap enough!
Tony
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Do you have any pics of the inside, it may be that they are using the case as the ground and the three wires are you 5v+, channel A and channel B.
Hood
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Hood,
I doubt it as the case is plastic.
I'll strip one tommorow and see if I can get some photos.
cheers
Tony
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might be worth contacting the guy in the following thread on CNC Zone to see if he ever found out the wiring. http://www.cnczone.com/forums/archive/index.php/t-17774.html
Also have you contacted the eBay seller to see if he knows?
Hood
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Tony,
try using a meter to check the resistance between the 3 wires. Many small units are of the resistive type and are effectively A,B & common and act as switches. To use them ground the common & use the other 2 as A & B, assuming there are pull-up resistors on the inputs.
Tony