Hi all,
Here is the essence of the longer drawn out question below:
When I measure continuity through a G24 wire to machine ground, I get two different readings when I swap the leads (pos. and negative) on my points that I am measuring. The electrons flowing one way through the machine yield a different resistance than the other way. :crazy:
Also, does anybody know what the difference between P24 and I think it was +24N is in Mazak machines?
I have never differentiated between the two since they are both positive 24VDC.
Battling my issue on a QT-15 that doesn't have the 24V system grounded through sections I cannot identify yet, I came across a phenomenon that someone here might have encountered before.
I am trying to fix the indexing on one of our H-400 horizontal mills. It has a MPS-510 M/T controller.
Measuring ground continuity between the labeled G24 wire on my 0°search switch in the left door to ground yields
0.8 K Ohm when I connect the negative lead to the wire terminal and the positive to machine ground,
and 0.2 Ohm when I connect the positive lead to the switch terminal and the negative lead to machine ground.
Shouldn't it be the same? I mean it completes the same circuit.
The same phenomenon occurs on the QT-15. I'll double check my other machines, but maybe someone has an explanation for this.
Maybe I simply don't understand some basic principles of how resistance is measured.
Thanks for any input.
Oliver
Here is the essence of the longer drawn out question below:
When I measure continuity through a G24 wire to machine ground, I get two different readings when I swap the leads (pos. and negative) on my points that I am measuring. The electrons flowing one way through the machine yield a different resistance than the other way. :crazy:
Also, does anybody know what the difference between P24 and I think it was +24N is in Mazak machines?
I have never differentiated between the two since they are both positive 24VDC.
Battling my issue on a QT-15 that doesn't have the 24V system grounded through sections I cannot identify yet, I came across a phenomenon that someone here might have encountered before.
I am trying to fix the indexing on one of our H-400 horizontal mills. It has a MPS-510 M/T controller.
Measuring ground continuity between the labeled G24 wire on my 0°search switch in the left door to ground yields
0.8 K Ohm when I connect the negative lead to the wire terminal and the positive to machine ground,
and 0.2 Ohm when I connect the positive lead to the switch terminal and the negative lead to machine ground.
Shouldn't it be the same? I mean it completes the same circuit.
The same phenomenon occurs on the QT-15. I'll double check my other machines, but maybe someone has an explanation for this.
Maybe I simply don't understand some basic principles of how resistance is measured.
Thanks for any input.
Oliver