Differences

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--- ve.bus:manual_parallel_and_three_phase_systems [2022-08-11 22:33] – [DC and AC wiring] mvader
+++ ve.bus:manual_parallel_and_three_phase_systems [2024-02-09 13:07] (current) – Removed “Weak LOM” setting. since that is currently the default jpasop
@@ Line 1: / Line 1: @@
-====== Parallel, split- and three phase VE.Bus systems ======
+====== Parallel, split- and three-phase VE.Bus systems ======
-This manual explains the details of designing, installing and configuring three-phase and parallel systems. It applies to components that use VE.Bus, for example MultiPlus, Quattro and some larger Phoenix inverters.
+This manual explains the details of designing, installing and configuring three-phase and parallel systems. It applies to components that use VE.Bus, for example, MultiPlus, Quattro and some larger VE.Bus inverters.
 **IMPORTANT:**
-  * Always update all units to the latest 400 firmware version ([[updating_firmware:updating_ve.bus_products|firmware update instructions]]).
+  * Always update all units to the latest firmware version during commissioning of the system: ([[updating_firmware:updating_ve.bus_products|firmware update instructions]]).
-  * Note that some parts of the description below apply only to 4xx firmwares.
+  * Note that some parts of the description below apply only to firmware version 400 and later.
-  * All units in one system must be the same type and firmware version, this includes same size, system voltage, and feature set. The type is indicated by the first four digits of the firmware version number. For details, see the "VE.Bus Firmware Numbering System" section in the [[https://www.victronenergy.nl/upload/documents/manual-VE.Bus-firmware-versions-explained-EN.pdf|VE.Bus Firmware versions explained document]].
+  * All units in one system must be the same type and firmware version; this includes same size, system voltage, and feature set. The type is indicated by the first four digits of the firmware version number. For details, see the "VE.Bus Firmware Numbering System" section in the [[https://www.victronenergy.nl/upload/documents/manual-VE.Bus-firmware-versions-explained-EN.pdf|VE.Bus Firmware versions explained document]].
   * Specify with your [[https://www.victronenergy.com/where-to-buy|Victron distributor]] that you will be connecting units in parallel or multi-phase and identical units must be supplied.
+  * The same number of units need to be installed on each phase. An example to clarify: 3 units on L1, 3 on L2, and 3 on L3 is OK. But 2 on L1, 3 on L2 and 3 on L3 is not OK. The only way such non-symmetrical installation is supported is when using no monitoring at all, or a Digital Multi Control. Combining such system with any other monitoring device, such as the VE.Bus Smart Dongle or a GX device like the Cerbo is not supported. Numbers and information shown on the GX device as well as VRM portal will or can be wrong, and controlling the system, for example setting input current limits will not always work properly either.
+  * While VE.Bus System Configurator allows setting up a system using Multis (each having a single AC input), that is configured to have multiple separate AC inputs, such system is not supported by GX devices.
+  * This information does __not__ apply to the Multi RS and Inverter RS models, which use a VE.Can interface (not VE.Bus) see the RS product manuals for specific information on programming them for three phase.
 ===== Warning =====
@@ Line 59: / Line 62: @@
 Note: Do not over-dimension the AC cabling. Using extra thick cabling has negative side effects.
-Technical background: in a parallel system, the AC current should be evenly distributed between all paralleled units. Now there are small differences in resistance of each inverter/charger, by definition. In the AC contactors for example. When the resistance in the cabling is too low, such small differences in resistance of the current path in a unit itself can results in a large relative difference. This results in bad current distribution.
+Technical background: for a properly working parallel system, the AC current should be evenly distributed between the paralleled units. The resistance in the cabling helps with that and is needed for that; to overcome small differences between one inverter/charger and another, for example in the AC contact on the AC input. When the resistance in the cabling is too low, such small differences in resistance of the current path in a unit itself can results in a large relative difference. This results in bad current distribution.
 An exaggerated example:
@@ Line 86: / Line 89: @@
   * All units must be daisy chained with the VE.Bus cable (RJ-45 cat5). The sequence for this is not important. Do not use terminators in the VE.Bus network.
   * The temperature sensor can be wired to any unit in the system. For a large battery bank it is possible to wire multiple temperature sensors. The system will use the one with the highest temperature to determine the temperature compensation.
-  * Wire the voltage sense on the master of L1.\\ (If the system has more than 1 AC input, connect it to the Master corresponding to the first AC input.)
+  * Wire the voltage sense on the master of L1.\\ (If the system has more than 1 AC input, connect it to the Master corresponding to the first AC input.) \\ All other units ignore their voltage sense input and receive the voltage sense value from the L1 master.
 ===== Configuration =====
@@ Line 101: / Line 104: @@
   * All charger settings, such as absorption voltage, float voltage and max charge current.\\ (The maximum charge current is multiplied by the number of units in the system: in a 9 unit system set it to 50A to get a 450A maximum charge current.)
   * System frequency
-  * Whether or not "Weak LOM" is used
 The following settings need to be made in the master of each phase:
   * Inverter output voltage
-  * Input current limits\\ (the effective input current limit is the setted limit multiplied by the number of units per phase. For example, setting a 10A limit with VEConfigure in a system with two units per phase results on a 20A limit for that phase. Being able to set a different limit per phase allows for maximum configurability.\\ \\ Setting an input current limit works differently when setting it on a remote control panel, for example a DMC or GX device. Then (a) only one value can be set by the user, not a different for each phase, and (b) the configured limit will be used as the total limit for each phase. Example, setting 30A in a three phase system of six units (two per phase), on a DMC or GX Device, results in a max input current limit of 30A per phase. The difference of both methods is due to the different use case of both ways of setting it: settings in VEConfigure are supposed to be fixed in the install and done be the installer, for example matching an installed generator. And the input current limit as set on the GX device is intended to be set by the end-user, for example on a yacht or in a motor home, and being able to set it depending on the actual shore connection - and ofcourse without having to do the maths of multiplying with the number of installed units on a phase.)
+  * Input current limits\\ (the effective input current limit is the limit set on the master multiplied by the number of units per phase. For example, setting a 10A limit with VEConfigure in a system with two units per phase results on a 20A limit for that phase. Being able to set a different limit per phase allows for maximum configurability.\\ \\ Setting an input current limit works differently when setting it on a remote control panel, for example a DMC or GX device. Then (a) only one value can be set by the user, not a different for each phase, and (b) the configured limit will be used as the total limit for each phase. Example, setting 30A in a three phase system of six units (two per phase), on a DMC or GX Device, results in a max input current limit of 30A per phase. The difference of both methods is due to the different use case of both ways of setting it: settings in VEConfigure are supposed to be fixed in the install and done be the installer, for example matching an installed generator. And the input current limit as set on the GX device is intended to be set by the end-user, for example on a yacht or in a motor home, and being able to set it depending on the actual shore connection - and ofcourse without having to do the maths of multiplying with the number of installed units on a phase.)
   * UPS function on/off
   * PowerAssist settings