Dear all ,
I am currently studying a really old control panel. There is 60 - 90 v on a turned off temperature controller (which controls a few heaters). Why does the live wire still carry 60 - 90 v. It should be either 230v when ON or 0v when OFF just like the other temperature controllers. There also isn't any thing that is giving off this range of voltages on the control panel. And I think it is this residual voltage that causes my temperature controller lcd screen to spoil .
The connections are as follows ---> Temperature controller - PLC - Heaters
So my question is .
1) where does this voltage comes from ?
2) Could this voltage be messing around with the input and output on the PLC ?
3) Could this be due to the fact that in this panel all the control wires are stacked very closely with power wires ?
Thank You.
I am currently studying a really old control panel. There is 60 - 90 v on a turned off temperature controller (which controls a few heaters). Why does the live wire still carry 60 - 90 v. It should be either 230v when ON or 0v when OFF just like the other temperature controllers. There also isn't any thing that is giving off this range of voltages on the control panel. And I think it is this residual voltage that causes my temperature controller lcd screen to spoil .
The connections are as follows ---> Temperature controller - PLC - Heaters
So my question is .
1) where does this voltage comes from ?
2) Could this voltage be messing around with the input and output on the PLC ?
3) Could this be due to the fact that in this panel all the control wires are stacked very closely with power wires ?
Thank You.
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