Spindle input to G540?

[blades]

How do I go about inputting a spindle signal into the G540? I have the wire that outputs the signal, but can't seem to figure out where to input it into the G540. Any help & direction greatly appreciated.

[blades]

Seriously? NO one who's looked at this thread has spindle speed control on their G540???
I thought this was a relatively common thing.

[morestuff]

I guess that this is a case of insufficient information to offer a useful answer.

What is the source of your signal? What kind of electrical interface does it have? Do you just want to measure the speed, or are you hoping to do closed loop control?

The G540 expects contact closures as input signals, so there may be issues with some types of sensors. You may also have to come up with a way to power the sensor.

Regards,
Steve Stallings
PMDX.COM - Products for CNC and motion control applications

[blades]

Thank you Steve. I had originally asked this question specific to the C3 Index Pulse Card from CNC4PC.com but received no response. I have the encoder installed & wired (other than the output wire), so I just needed to know where the G540 requires this signal input in order to control spindle RPM via program (for threading on a lathe).

[morestuff]

To use a C3 card you must satisfy two prerequisites.

First, the C3 needs to be powered from an isolated
5 volt supply. The G540 cannot provide this, and if
you get the 5 volts from the computer, then the
optoisolation in the G540 will be bypassed.

Second, your C3 card will need to be the newer
version that has a jumper allowing the output to be
set to "open collector". This is needed so that it
drives the G540 input in the same manner as a
mechanical switch or an NPN proximity sensor.

The pin assignment can be any of the input pins
on the G540. It simply reports the signal to the host
computer and it is up to the software on the host
to measure the speed or coordinate threading.

Regards,
Steve Stallings
PMDX.COM - Products for CNC and motion control applications

[blades]

I received a parallel response in the mini-lathe forum as well, verifying exactly what you mentioned regarding the inputs. I've got everything set up per requirements: isolated 5V source hooked up to the appropriate revision C3 board.

This whole issue or question I've had about hooking this up relates more to my inexperience and/or ignorance to the G540 inputs. I somehow got the notion that the 4 inputs on the G540 were only for limit/home switches.

This question can be considered resolved. Thank you again, Steve.