Can Acorn support 2 pulses per Rev. to give an accurate spindle rpm

[Chas]

Hi, just a quickie. My Elte router spindle outputs 2 pulses per rev. for the purpose of reading accurate rpm. Is Acorn capable of accepting 2 pulses per rev or is it a fixed setting at 1 pulse per rev?.
many thanks
Charlie

[eng199]

It reads an encoder, giving typically 1024 pulses per revolution.
1 or 2 sensor input is not supported, unless I missed it or forgot about it being added.

[tblough]

Depending on the pulse characteristics (it would need to be a differential 5V signal or converted into one), you could wire this into the spindle encoder Z (index) channel. You could then use a T flip flop to remove every other pulse, or possibly program a 2.0 gear ratio.

[cncsnw]

I think that is what an "RPM_Sensor" input, in the Acorn Wizard and PLC program, is supposed to do.

You might need to tweak the logic slightly to get it to read correctly with two pulses per rev instead of one.

See "RPM_Sensor", "RPMSensorStage", and "SpinSensorTimer_FW" in any standard Acorn PLC program for details.