C1N3 Posted November 8, 2016 Share Posted November 8, 2016 Hi all We have installed a Inifini 10kw as per CreoVision"s "infini 10kW Modbus Grid Limiting Installation Guide" Thanks to Peter for his hard work. However we are experiencing a Caution / Fault in the event log (no electrical ground) [19] As soon as the AC breaker on the inverter is switched on the Ground fault [19] appears and the inverter goes into a fault mode Our electrician has tested the earth/grounding and is getting around 10-15 ohms. Has any one experienced this issue and or can help in CT? Thanks. Quote Link to comment Share on other sites More sharing options...
Jaco De Jongh Posted November 8, 2016 Share Posted November 8, 2016 Welcome. That reading is way to high in my opinion. How did you earth the Inverter? Sent from my SM-N910F using Tapatalk Quote Link to comment Share on other sites More sharing options...
Coulomb Posted November 8, 2016 Share Posted November 8, 2016 (edited) I believe that the appropriate Australian Standard stipulates a maximum of 2 ohms from an appliance to the earth-neutral connection. Of course, that has no jurisdiction in South Africa, but it suggests strongly to me that the measured resistance is very high. The above is from memory, I haven't paid for a copy of the standard. Edit: the variation (10-15 is a 50% variation) suggests a poor connection, but the electrician may have been measuring to a different earth. I suggest the problem is earth leakage, not absolute resistance to the earth itself; the inverter can't measure the latter. Edited November 8, 2016 by Coulomb Quote Link to comment Share on other sites More sharing options...
C1N3 Posted November 9, 2016 Author Share Posted November 9, 2016 Hi Guys Thanks. The inverter is grounded to the main db board ground/earth bus bar. I will get the electrician to test the ground ohms at the inverter and report back. Quote Link to comment Share on other sites More sharing options...
Jaco De Jongh Posted November 9, 2016 Share Posted November 9, 2016 Hi Guys Thanks. The inverter is grounded to the main db board ground/earth bus bar. I will get the electrician to test the ground ohms at the inverter and report back. Please ask him to measure the voltage between the neutral point and earth also and include that reading in your reply. Sent from my SM-N910F using Tapatalk Jaws 1 Quote Link to comment Share on other sites More sharing options...
Coulomb Posted November 9, 2016 Share Posted November 9, 2016 3 hours ago, Jaco de Jongh said: Please ask him to measure the voltage between the neutral point and earth also Yes. A friend had a high resistance neutral connection at his pole, and it caused odd problems with his grid interactive inverters (before his Axpert was installed). When he finally got around to reporting it to the local electricity distributor, they came to check it quick smart. Apparently, a high neutral voltage can cause bad problems, some of which may involve litigation. His problem turned out to be a nuisance, not serious, but they didn't want to take chances. Quote Link to comment Share on other sites More sharing options...
Jaco De Jongh Posted November 9, 2016 Share Posted November 9, 2016 @C1N3, can you please supply us with the Model number or alternatively an link to the manual.? I just want to have a look at something. Quote Link to comment Share on other sites More sharing options...
Mike Posted November 9, 2016 Share Posted November 9, 2016 i have it in my files at this link: https://www.facebook.com/groups/ThorneSolar/files/ Jaco De Jongh 1 Quote Link to comment Share on other sites More sharing options...
C1N3 Posted November 9, 2016 Author Share Posted November 9, 2016 Thanks guys still waiting on feedback from electrician. Cheers Marc Quote Link to comment Share on other sites More sharing options...
Jaco De Jongh Posted November 9, 2016 Share Posted November 9, 2016 2 hours ago, Mike said: i have it in my files at this link: https://www.facebook.com/groups/ThorneSolar/files/ @Mike, thanks for the link, but unfortunately I font have a FB account. Quote Link to comment Share on other sites More sharing options...
Mike Posted November 10, 2016 Share Posted November 10, 2016 got the solution from Voltronic... You need to relax the earth leakage value in the system. the only way is by installing the latest firmware available from them. they have encountered this before C1N3 1 Quote Link to comment Share on other sites More sharing options...
C1N3 Posted November 10, 2016 Author Share Posted November 10, 2016 Hi Mike We have installed the (20160412) firmware from Creovision 20160412 Firmware Im not sure if this is the latest but we are getting the Fault on this firmware version. Has Voltronic sent you the latest firmware? " You need to relax the earth leakage value in the system " Is this setting in Solarpower software? Thanks a lot. Quote Link to comment Share on other sites More sharing options...
Mike Posted November 10, 2016 Share Posted November 10, 2016 nope, you would have to request it from them directly. i have not had a need for it yet. Nope, the firmware update is what rectifies the ground fault. Quote Link to comment Share on other sites More sharing options...
C1N3 Posted November 10, 2016 Author Share Posted November 10, 2016 Great thanks I have emailed them. Will give you an update. Quote Link to comment Share on other sites More sharing options...
Jackal Posted November 22, 2016 Share Posted November 22, 2016 I've been working with C1N3 to try and resolve and we've had no luck and getting to the point of returning the unit to Mustek because we can't get it working. Inverter works perfectly and carries load when Eskom breaker is down and only running off PV and battery supplying UPS loads. As soon as the AC input breaker on the mains side of inverter is flipped inverter throws fault 19 and goes offline. We have tried:- 2x different Infini units and get same error (we got another unit from Mustek)- 2x different electricians to review the installation on the AC side - Tested earth resistance which is 1ohm when council is connected and 12ohm when council earth is removed and only using house earth spike - Phase frequency and voltage all good on all phases - Zero voltage between all phases and neutral and earth - Firmware from Creovision (which they got from Mustek) as well as the default firmware the unit ships with- Tried changing standards standards from VDE4105, VDE0126 and NRS097 - none work- Panels are earthed and neutral and earth are bonded on both AC input side (grid tie) and AC output (UPS) sides All other ideas welcome! Quote Link to comment Share on other sites More sharing options...
SilverNodashi Posted November 22, 2016 Share Posted November 22, 2016 3 minutes ago, Jackal said: I've been working with C1N3 to try and resolve and we've had no luck and getting to the point of returning the unit to Mustek because we can't get it working. Inverter works perfectly and carries load when Eskom breaker is down and only running off PV and battery supplying UPS loads. As soon as the AC input breaker on the mains side of inverter is flipped inverter throws fault 19 and goes offline. We have tried: - 2x different Infini units and get same error (we got another unit from Mustek) - 2x different electricians to review the installation on the AC side - Tested earth resistance which is 1ohm when council is connected and 12ohm when council earth is removed and only using house earth spike - Phase frequency and voltage all good on all phases - Zero voltage between all phases and neutral and earth - Firmware from Creovision (which they got from Mustek) as well as the default firmware the unit ships with - Tried changing standards standards from VDE4105, VDE0126 and NRS097 - none work - Panels are earthed and neutral and earth are bonded on both AC input side (grid tie) and AC output (UPS) sides All other ideas welcome! If you say it's 1Ohm when council power is on, but 12Ohm when off, does your circuit breaker break the council earth as well? Normally,earth to council doesn't get disconnected. I've only ever installed these units in a totally off-grid scenario, i.e. no eskom, so I didn't pick this up. Also, do you have a surge arrestor installed? Quote Link to comment Share on other sites More sharing options...
Jaco De Jongh Posted November 22, 2016 Share Posted November 22, 2016 @Jackal, I would still love to have a look at the Manuel, can you please post a link. Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted November 22, 2016 Share Posted November 22, 2016 37 minutes ago, Jaco de Jongh said: @Jackal, I would still love to have a look at the Manuel, can you please post a link. http://www.voltronicpower.com/oCart2/files/manual/InfiniSolar-10KW-manual-20150130.pdf Quote Link to comment Share on other sites More sharing options...
Jackal Posted November 22, 2016 Share Posted November 22, 2016 When I tested the ohms I first physically disconnected the earth wire of the council from the earth bar in the board on the street and only tested resistance of earth spike which was 12ohms. Then I reconnected council earth wire and got a reading of 1ohm. Quote Link to comment Share on other sites More sharing options...
SilverNodashi Posted November 22, 2016 Share Posted November 22, 2016 48 minutes ago, Jackal said: When I tested the ohms I first physically disconnected the earth wire of the council from the earth bar in the board on the street and only tested resistance of earth spike which was 12ohms. Then I reconnected council earth wire and got a reading of 1ohm. The council earth cable should still remain fixed. It's practically the best eart wire you can get. Earth rods often don't earth as well, due to the composition of the, well, earth In some cases you might have to put an earth rod a couple meter deep, and in some case put a couple earth rods in. Every place is different so there's no "magic formula". There are a couple companies who specialize in earthing and surge protection. It might be worthwhile to talk to the electrical engineers in your town's council, as they would often know best what's going on in your area. Quote Link to comment Share on other sites More sharing options...
Jackal Posted November 22, 2016 Share Posted November 22, 2016 Thanks SilverN, just to clarify that the council earth is connected, I just disconnected temporarily to ensure that the house earth spike was within spec on its own without the help of the council. Quote Link to comment Share on other sites More sharing options...
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