On 06/02/2019 10:00 PM, Gene Heskett wrote:
And creates a huge ground loop.
The shielding on the motors drive cables should quit before it gets to
the motor and the other end should be tied to ground at said bolt.
Yup, exactly. They have NO IDEA what they are talking
about. The encoder should be isolated electrically from the
motor frame, and if it has a metal shell, then that shell
can be tied to the shield ground from the machine. In the
case of the CUI encoders, DON'T tie the shield to the motor,
that's the WORST thing you could do!
Also, a lot of these cheap encoders (CUI and US Digital)
benefit greatly from a small capacitor (0.1 uF) right at the
encoder's power terminals when long cables (more than a few
feet) are used.
Finally, many of these encoders, even if they have a
totem-pole output, benefit from a pull-up resistor on the
outputs to +5 V at the receiving end.
Jon
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