Re: [CAD_CAM_EDM_DRO] Gaining steps somewhere

David

Thanks, your confidence that noise was causing my encoder to gain steps , plus your suggestion to use a Rutex R516 single end to differential driver set me on the right page..Below is excerp from US Digital for their equivalent driver..I read that and interpreted it to mean that their driver was an amplifier for longer cable runs and the bypass capacitor worked to solve the noise problem--- like I have...I wired in a .1uf cap next to my encoder and now can ground the shield without throwing her into wicked oscillations..Also there is no longer any missed steps..Problem solved ..Thanks again for your help..

Steven

The EA-D8, EA-D10, EA-D5 and EA-D6 drivers use an industry standard 26C31 driver chip. The EA-D10HV and EA-D5HV use the ET7272 driver chip. An on-board 0.1 uF bypass capacitor across the power pins on each of these adapters compensates for inductance and noise, which can be expected at the end of a long cable.

----- Original Message -----
From: David Paulson
To: CAD_CAM_EDM_DRO@yahoogroups.com
Sent: Sunday, August 28, 2005 9:59 PM
Subject: Re: [CAD_CAM_EDM_DRO] Gaining steps somewhere


Grounding the shield should never create any oscilation. Make sure that
the shield is soldered to the db9 connector end only. If you cannot
correct this problem, I would suggest purchasing the r516 driver from
rutex. This chip will convert a single end encoder signal into a
differential signal. The A and B signal will have a complementary A NOT
and B NOT . The signals must be 180 deg phase difference then the A and
B signal if they are to be counted. If you have noise in your setup,
these signals are the same phase. This will correct your problem.
David




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