Lynx SM 16 wiring anomoly - help

[Nemo1966]

It's written to confuse. My interpretation that I'm very comfortable with:


"Potentiometer 10k minimum" : There are other on-board controls to set the minimum speed and I guess they don't want to influence that circuitry by the installer using a silly-small potentiometer. I would expect the on-board pot to be a lowish value to provide an offset above zero when placed in series with the speed control pot. If the speed control pot was too small then the on-board pot would become more dominant as part of the potential divider, and the effective speed control would be limited to a higher minimum speed. Or, potentially disk damaging the on-board control. However, this is belts-and-braces stuff.



"Impedance 100k ohm filtered" - as Cropwell said - it characterised the input equivalent circuit, more or less. Nothing to do with the external control.

"0 to +10V" - as an alternative to using the recommended minimum 10k potentiometer, you are able to drive a speed command in the range 0-10V, wrt 0V/pin 4 (note: NOT wrt pin-2 used for the potentiometer).

So, yes, you can drive the input with 0-10V from the spindle card (your words), provided that you can share a common 0V reference from the spindle-card output to the 0V on this SM 16 / pin 4.

Firstly - thank you for taking time to reply to my mind-numbingly simple posts.

So 0v to pin 4 (what does wrt denote please?). Do I connect +10v to pin 1 or pin 3?

Pic below is MB3 0-10v analogue



thanks again