drafts:multigrid_faq
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drafts:multigrid_faq [2018-12-08 01:56] – Multigrid on vehicles or boats leonard | drafts:multigrid_faq [2019-02-01 13:39] (current) – [# Nuisance Tripping of Residual Current Devices (RCDs)] guy_stewart | ||
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====== Multigrid Troubleshooting FAQ ====== | ====== Multigrid Troubleshooting FAQ ====== | ||
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+ | === DRAFT === | ||
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===== # Error 11. ===== | ===== # Error 11. ===== | ||
- | + | For issues relating | |
- | Error 11 refers to a fault state where an internal relay check is performed to assess if there is a functioning neutral earth link in the electrical system. If a neutral earth link is not found, the Multigrid will engage the relay and create this link. | + | |please read the VE.Bus Error Codes page]]. |
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- | There can only be 1 earth, neutral link bond (NEM) in each installation. | + | |
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- | In the event of a detected grid outage, the Multigrid will disconnected (" | + | |
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- | It is important for the operation of this relay, that the neutral links on the AC input and AC output of the Multigrid remain isolated from each other. | + | |
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- | If there is a connection detected between these two neutrals, it will trigger | + | |
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- | If you are adding the Multigrid to existing wiring and intend to seperate the essential (AC-Out) and non-essential (AC-In) loads; It is recommended to disconnect all existing distribution board wiring for these and re-wire the board with them structurally separated and clearly labelled. | + | |
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- | To be clear, that is two separated, neutral buses. One for the mains grid supply and one for the AC-Out ' | + | |
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- | It will only take one instance of a circuit with the active connected to the AC-out, while the neutral is connected to the AC-in neutral | + | |
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- | Furthermore, | + | |
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- | If you are not separating the loads into Essential and Non-essential, and all loads will be connected to the AC-Out of the Multigrid, then you will STILL have 2 seperate neutrals. However the ONLY load on the Main Grid Supply neutral will be the Multigrid AC-Input. | + | |
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- | This will still cause the NEM link to be broken during an outage, and the new NEM link to be made inside | + | |
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- | You will need to run two Active and two Neutrals to the Multigrid, one for the AC-In and one for the AC-out. They will share the same common earth. | + | |
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- | {{: | + | |
===== # Nuisance Tripping of Residual Current Devices (RCDs) ===== | ===== # Nuisance Tripping of Residual Current Devices (RCDs) ===== | ||
- | + | See Wiring Unlimited. | |
- | The test required for the Neutral Earth link introduces a small amount of Neutral Earth current leakage. This is estimated to be less than 10 mA, well below the normal RCD trip threshold of 30 mA. | + | |
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- | However, there may be other devices on the electrical circuit which are also introducing a small 'below threshold' | + | |
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- | As the Multigrid relay check is an essential safety feature, the other devices that are contributing to the total leakage about 30 mA will need to be identified and removed from the system. | + | |
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- | Some common troublesome appliances to check and disconnect first when troubleshooting are: | + | |
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- | * Surge Protected Power-boards | + | |
- | * Old refrigerator compressors | + | |
- | * Electric hot water units (due to their own earth differential from the main earth stake). | + | |
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- | If removing/ | + | |
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- | If multiple circuits sharing a single RCD each have a small leakage, replace it with RCBO’s on each of the circuits to bring down the total to within the limits. | + | |
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- | ===== Multigrid on vehicles or boats===== | + | |
- | The Multigrid is designed to feedback energy to the grid in compliance with several country standards. Loss of mains (LOM) detection in different flavors is the key to that. While LOM is suitable to stop feeding in energy to the grid in case of an power outage, it is not fast enough to have no life parts on a plug if you pull him out of a socket. So feeding power back to the grid through a normal power cord and plug is not possible. The manual says not to invert neutral and line connection and not to use a RCD type A on the connection to the grid. RCD type B is suitable. If you are using a symmetrical plug like CEE7/4 (Schuko) neutral and line is not defined and a normal socket is protected with an RCD type A (and not type B). Obviously you can't comply with these two requirements as described above if you have no fixed or special connection. As long as you don't setup your Multigrid to feedback that's not a problem because these two requirements are just necessary in case of a setup for energy feedback. | + |
drafts/multigrid_faq.1544230616.txt.gz · Last modified: 2018-12-08 01:56 by leonard