So I'm trying to figure out how to get an accurate RPM reading on our Colombo spindle. I'm walking into a job that was left 1/2 done and I admit I'm not an expert, I'm just the guy that it falls to make it work.
Firstly, the spindle is brand spankin new, old one burnt out as the guys that did the 'retrofit' didn't know that the air wasn't cooling the spindle, so at least I know that the spindle is good and the sensors are in working condition.
Now here's my problem, the sensor is listed as a NAMUR, which a quick google told me is an inductive pickup sensor.
The spindle should be sending 2 pulses per rotation, so I set it up to send 5v to the sensor and the return to lucky 13 on the input and told Mach 4 control and ESS that is the spindle RPM sensor pin.
Well, it's getting........something?
Speed reading is bouncing all over the place at rest and has no real relation to actual spindle speed (checked by running spindle directly from VFD at lowest speed and watching readout).
So what am I missing? Sensor power range is listed as 5-30vdc, but later notes in the manual state +24vcc for all the sensor power needs. Does this mean I'm going to have to puzzle out a step down or some other means for the system to read the sensor?