Hi all;
I'm back working on my mill with spindle tachometer, to utilize Andy Pugh's
automatic spindle speed selector example code.
I have, from the spindle sensor, input going to a 6N138 optoisolator's
input. Ground and voltage source tied to machine. It sources enough current
to drive the input quite well. (originally sent to the input of an Amtel
processor in the LED spindle speed display)
Output of 6N138, with +5v, ground, to the 7i76 ENCA+ and surrounding
connectors on the 7i76.
Looking with Halscope gives me a pretty good signal on
hm2_5i25.0.encoder.00.input-a. Running at 1,000 rpm gives me 14 "square"
teeth, running at 500 rpm gives me 7, and running at 300rpm gives me 4.
(not that the counts mean much, except that the reading tracks spindle
speed linearly)
The 7i76 jumper is set for TTL input. ONLY the ENCA+ input pin has anything
connected, the IDX, ENCB+/- and ENCA- are all left floating.
The issue I have is that the velocity never seems to do much other than
just futz around between 6 and 40, no matter what the spindle speed.
Here's my ini code:
setp hm2_5i25.0.encoder.00.counter-mode 1
setp hm2_5i25.0.encoder.00.filter 1
setp hm2_5i25.0.encoder.00.index-invert 0
setp hm2_5i25.0.encoder.00.index-mask 0
setp hm2_5i25.0.encoder.00.index-mask-invert 0
setp hm2_5i25.0.encoder.00.latch-enable 0
setp hm2_5i25.0.encoder.00.scale -16
setp hm2_5i25.0.encoder.00.vel-timeout 1.0
Should I tie the other encoder lines high/low or to somewhere? (especially
the index pulse)
Anybody with some advice?
Thank you - John A. Stewart.
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