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Author Topic: HP ENCODER QEDS-7148  (Read 5582 times)

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Offline comet

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HP ENCODER QEDS-7148
« on: December 04, 2007, 04:53:14 PM »
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

Offline Hood

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Re: HP ENCODER QEDS-7148
« Reply #1 on: December 04, 2007, 06:28:50 PM »
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

Offline comet

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Re: HP ENCODER QEDS-7148
« Reply #2 on: December 04, 2007, 07:21:24 PM »
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

Offline Hood

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Re: HP ENCODER QEDS-7148
« Reply #3 on: December 04, 2007, 07:29:50 PM »
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

Offline comet

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Re: HP ENCODER QEDS-7148
« Reply #4 on: December 04, 2007, 07:35:17 PM »
Hood,
  I doubt it as the case is plastic.
I'll strip one tommorow and see if I can get some photos.
   cheers
   Tony

Offline Hood

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Re: HP ENCODER QEDS-7148
« Reply #5 on: December 04, 2007, 07:43:54 PM »
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

Offline TonyP

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Re: HP ENCODER QEDS-7148
« Reply #6 on: December 05, 2007, 04:28:18 AM »
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