We have started to install a emonpi2 with 6 ct clips into our cu. The first (ct1) ct reads the input from the meter and has a 200amp ct installed as its a 100amp feed. Under the insulation (edit. Sorry got the wrong spelling - Installation) we have set it to 100amp ct.
The next ct clips are placed on the outputs from the cu. We have two (ct2 and ct3) 64amp outputs fitted with 100amp ct and two (ct4 and ct6) 32amp outputs fitted with 50amp ct clips.
Set up the logging to display kwh.
When looking af the screen, it shows ct1 value much lower than ct2. We have checked and rechecked that the ct clips are all in the right place etc.
Your calibration settings in emonCMS Serial Config Tool are wrong.
You need the numbers in the āCT Typeā column to match the rating of the c.t., not the actual current.
[Explanation: The output of the c.t. is 0.333 V at the rated current. The number you set in āCT Typeā then scales this to amps, so that it reads correctly. Iām assuming you bought your c.tās from our Shop.]
Firstly I donāt have an emonPi2, so the comments below are basically guesswork! (but I do have some older Open Energy equipment). And I donāt have an explanation for the measurement results from ct1,2,3.
Comparing your picture of the Serial Config Tool with the one in the Docs https://docs.openenergymonitor.org/emonpi2/install.html#ct-calibration-selection
You have the voltage calibration (near the top of the picture) set at 230.00 %. This is a % setting, not a voltage. The Docs page has it set at 101.30 %, which I think is the correct default value in the firmware.
The value of 230.00% may also explain why the your feed picture shows a value of -92.43 volts for V1. This should be equal to your mains voltage, i.e around 240V. Iām not sure where the minus sign has come from, unless it 's an artifact of the calculations with the 230.00% calibration. If the voltage calibration is incorrect, the power and energy values measured will be wrong too, as power is an average of the instantaneous (volts x amps).
Also the Docs page shows the phase correction values for all types of ct as 3.2 rather than the zero that you have. I donāt think this will make much difference to the measured results.
There should never be a need to change this, provided the power supply & voltage reference source for your emonPi2 is an emonVS.
@Uk_pete_2000
Did you change that? Why? Letās see what numbers you get when you correct this. The numbers on the Feeds page are meaningless until we know what input processing you have, but I suspect the -92 V is overflow in the maths (when writing the library, it never occurred to me that anyone would change the voltage calibration by more than a few percent, because it should never need changing - not even for use with 120 V mains supplies). The Inputs page is far more useful when looking for problems with inputs - itās the second stage in the process where the input numbers are available for checking, the first being the emonHub log.
I am sure what the setting was when it first opened. It was blank and i read it as voltage and as otherthings where not working i must have set it to 230, 240, 248, 250 etc to see what effect it had. In the end i settled on 230 as thats uk normal voltage.
As i now got even greater problems in that i can not get feeds displayed, can not get to ssh, can not seem to do anything with. Iāll just have to plod on best i can
If not, the first step will be to do a controlled shut-down using the front panel button to select Shutdown, then wait as directed. Leave a few moments with the emonVs unplugged and then power up again.
Did you enable SSH earlier? Itās disabled by default - you can enable it by the front panel or by writing a file onto the SD card.
Have you removed the power without doing the controlled shutdown? If you have, you might have damaged the SD card, in which case (and if you are able) Iād suggest downloading the image and re-writing it as the first step.
Inside your emonPi, you have a Raspberry Pi and an Atmel DB processor. The Atmel-DB processor does the analogue to digital conversion, rms and energy calculations and scales the values to calibrate for the different c.tās. It sends numbers to the Raspberry Pi. The RPi then processes these, runs a web server and builds web pages for you to interact with, and stores the data.
I canāt quite see how fouling up the DB front end could screw up the emonCMS and the RPi. Granted, the numbers will be meaningless but emonCMS shouldnāt lock up. Even if itās the Serial Config tool itself thatās locked up, I wouldnāt have expected a total system failure.
Okay. Starting with the first problem i went back into the serial config screen and notice things missing. So stopped hub, started serial and noticed there was a factory reset. Pressed it and yep that worked
Thereās no need to explain what you did - it was ājustā all the values were wrong to the extent it couldnāt handle them.
Now the Feeds.
You need to set those up on the Inputs page. Are you familiar with this or do you need some help? What do you want to record, so that you can display the values later?
The feeds where set up, before and look like they where working, just wrong figures. So i re-read the guide and noticed a tip about input settings. So i deleted the bits i had set up and then clicked the cog, and chose emonpi2. Unticked the e entries as i only have ct clips.
Came out and tried to look at feeds and got the following
So went back to inputs, pressed cog, went to emonpi2 and noticed a delete, so did that. Back to feeds same problem
Looked the problem up and it indicates a factory reset, by issue command. So looked up how to get in. Went to box and enabled ssh. Then came the problem of userid/password.
Still not sure of the combination but i think ive tried various ones (not sure if okay to list.) But can not get terminal to work. Tried another ssh terminal and this ask for a keyid, thoght it did generate one, etc, but i get as far as Shell, then connection terminated
Now Iām lost - why do you want to get in via SSH? It looks to me as if thereās no need. In any case, the user is pi (for your terminal program, it might be ā[email protected]ā) and the password emonpi2016.
Itās probably easier to set up your Feeds by hand.
I presume on the Inputs page you have your 6 powers (watts), 6 energies (kWh) and 1 voltage. Plus a pulse count youāre not interested in?
I am going through the guide. Step 9 is about setting up the feeds. At present i dont know if i need them or not, but im trying to understand. In the end i have 4 more of these to set up, so starting with one and getting to know it etc helps
Do i need feeds for graphs, history etc etc. Rhetorical question
I can set up under input screen, but it states i already have a feed created, so i can only add to the listing, nor can i display the feeds screen
Edit - and i can not get rid of the feeds that where set up by the tip.
A search said to reset emonpi2 back to factor settkngs to resolve problem. After that ll need to reimage it
That needs to be sorted out first. Iād suggest a controlled power-down - or a reboot of the Pi from the Admin page, and see if it clears before going for a full reset.
It sounds like the factory reset script will be the quickest answer. Is the ID/password combination above one of those you tried? (BTW, Are you on a Windows box or Linux? )
Itās emonsd If you click on your version here