I am not sure about SW but some software packages have an .INI file that can be edited with a text editor to define preferences, splash screens, etc. Be sure save a copy of the original .INI file as a text file just in case, e.g. xxxxxx.original.ini.txt. Saving it as a TXT file prevents it from...
Agreed. As I noted in another post, I am a C programmer and have just ventured into PLCs. My C programming work is usualy in the area of embedded systems. The PLC program I developed over a couple 10s of hours, including the time taken to study the manuals and tutorials, took less time than what...
Gents. I just completed my first Seimens LOGO PLC program using a demo version of their Soft Comfort software. I used
Function Blocks as I do not know ladder logic and because I am a C programmer. Below is the plan I used to develop the logic for a series function blocks used to generate...
I am looking for similar information and found a thread that maybe OT but I think offers some intersting insights and links to external sources.
thread240-13068
Regards.
I will add that it may be possible to combine the superheterodyne and DSP techniques and digitally process difference signal at the difference frequency. Thus the sampling for the DSP analysis need not be as high as what would be required for the "raw" signal but, instead, could be tuned to the...
I am just thinking out of the box and throwing out this as an idea. With signals around 100kHz you might want to study RF techniques, specifically superheterodyne signal processing. An incoming signal is mixed with a reference signal at frequency different from that of the known signal by a...
Hello Waross, Slava and others.
The source of the resistive leakage path to ground has been identified as a resistor network in a piece of equipment that, by design, includes a High R path to ground. This High R leakage resistance is in the order of a few hundred kOhms. As Slava suggested, we...
Hi Slava, Thanks for the informative diagrams of a faulted system showing the capacitive charging and fault currents in the system. As your diagram shows no charging current in the faulted phase it follows that the vector diagram in the graphic I posted should be using 2Ico rather than 3Ico...
I thought I would post a graphic of the vectors associated with fault and capacitive charging currents in a high resistance grounded system using an NGR (RN). This graphic does not show the suspected parasitic resistance that was the reason for the original post. Regards.
Waross et al. You have given me a lot of information to work with over the next while. I am not sure when I will be be able to update this thread with a definitive outcome. I want to say thanks for your help before this thread goes stale and is closed. Thanks and Regards.
Waross: Your suggestion to add a fault using a known high resistance makes sense to me. If I fault the system with a 6940 Ohm resistance I will have a 1/3 to 2/3 relationship in the resistive elements of the resulting voltage divider. Any difference in this ratio would be due to the contribution...
Golestan and others: I think an entry I made in another thread applies here. If the old BASIC programs are reliable (read bug free) and sizable it might make sense to try to stay with BASIC. Even switching to another dialect of BASIC might introduce issues (bugs) that would require...
The relay has two inputs, one from a CT monitoring the current through the NGR and one, a voltage input, from the sense resistor described earlier.
When system power is on and if the relay detects measurable current through the NGR it uses this value with the input from the sense resistor to...
Waross: Again, I apologize but all I can add at this time follows. The Let Through Current specified by the customer is 100 mA which makes for an NGR value of 3470 Ohms. The relay is connected to the NGR through a 138 kOhm sense resistor. The sense resistor connects to the same terminal on the...
