Differences

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--- ve.bus:manual_parallel_and_three_phase_systems [2019-02-09 03:09] – external edit 127.0.0.1
+++ ve.bus:manual_parallel_and_three_phase_systems [2019-10-15 10:53] – [DC and AC wiring] guy_stewart
@@ Line 1: / Line 1: @@
 ====== Parallel 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 Phoenix 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 400 firmware version ([[updating_firmware:updating_ve.bus_products|firmware update instructions]]).
   * Note that some parts of the description below apply only to 4xx firmwares.
   * 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.
 ===== Warning =====
@@ Line 38: / Line 39: @@
 ===== DC and AC wiring =====
-Both the DC and AC wiring needs to be symmetrical per phase: use the same length, type and cross-section to every unit in the phase. To make this easy, use a bus-bar or power-post before and after the inverter/chargers.
 The VE.Bus cluster maintains a single 'global' status for SoC, DC voltage, and DC current. Every DC connection (on every Multi/Quattro and on every battery) has to be connected together to a single DC bus. Do //not// build systems with separated batteries on multiple (separated) DC bus structures connected to subsets of the Multi/Quattro units in the cluster. This will //not// work.
 Also beware of sizing the battery cable and jumpers between cells/batteries.
+For units in parallel: Both the DC and AC wiring needs to be symmetrical per phase: use the same length, type and cross-section to every unit in the phase. To make this easy, use a bus-bar or power-post before and after the inverter/chargers.
 For units in parallel: use one AC fuse for all units on that phase. Both on the input, and on the output. Multiple fuses which are mechanically connected together is ok: that is also one fuse.
@@ Line 48: / Line 50: @@
 For DC, one fuse per phase is best. If a big single fuse is not available, use one fuse per unit. Same type of fuse due to same resistance.
-Beware of phase rotation between the inverter and AC in. When wired in the wrong rotation, the system will not accept the mains input and only operates in inverter mode. In that case swap two phases to correct it.
+Beware of phase rotation between the inverter and AC in. When wired in a rotation that is different to the programming of the Multis, the system will not accept the mains input and only operates in inverter mode. [[https://www.victronenergy.com/live/ccgx:start#phase_rotation_warning|If a GX device is connected, it will signal a phase rotation alarm]]. In that case swap two phases to correct it, or re-program the units to match the wiring rotation.
 Note: Do not over-dimension the AC cabling. Using extra thick cabling has negative side effects.\\
@@ Line 54: / Line 56: @@
       * Using 2 units (A and B) parallel and using extremely good cabling one might achieve a total resistance for Unit_A of 0.0001Ω and a total resistance for Unit_B of 0.0002Ω. This results in Unit_A carrying twice as much current as Unit_B although the resistance difference is very small.
       * Using the same 2 units in parallel with bad AC cabling one might end up with a total resistance for Unit_A of 15Ω and a total resistance for Unit_B of 16Ω. This results in a much better current distribution (Unit_A will carry 1.066 times more current than Unit_A) even if the absolute difference in resistance is much bigger than in the previous example (1Ω vs 0.0001Ω).
+==== A continuous, unbroken negative link must be maintained between all units ====
+VE.Bus is not isolated on the MultiPlus range and Quattros.
+Therefore it is very important to prevent damage to the communications cards that the negative battery terminal of a Quattro remains continuous between units as long as the VE.Bus cable that connects the multiple units is connected.
+If units need to be isolated at both poles, or local wiring requirements demand double pole isolation for each unit, the communications cables must be removed first AND appropriate safety signage needs to clearly explain this.
+Double pole isolation of the system is allowed (and sometimes required), as long as it at the battery connection end of the DC bus, and the Quattros remain with continuous negative between themselves.
 Theory and background information on wiring is further explained in these presentations:
   * {{:ve.bus:4._ripple_in_a_ac_battery_system.pdf|presentation - DC Ripple}}
-  * {{:ve.bus:rva_-_theory_on_wiring_large_systems.pdf|presentation - Theory on wiring large systems}}
+  * {{:ve.bus:rva_-_theory_on_wiring_large_systems.pdf|presentation - Theory on wiring large systems}}'
+  * [[https://www.victronenergy.com/upload/documents/Wiring-Unlimited-EN.pdf|Wiring Unlimited - Chapter 4 - DC Wiring - Parallel and/or 3 phase systems]].
 ===== Communication wiring =====
   * 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.
@@ Line 64: / Line 80: @@
 ===== Configuration =====
+Note: Special considerations exist before initial power-up for large systems using Redflow batteries: [[https://redflow.zendesk.com/hc/en-us/articles/360029645212|Click here for details]].
 In the [[https://www.victronenergy.com/support-and-downloads/software#ve-configuration-tools-for-ve-bus-products|VE Configuration tools]] there are two different programs. One to configure small systems and  one for larger systems:
   * Up to three units: use VE.Bus Quick Configure
@@ Line 78: / Line 97: @@
   * Input current limits.\\ This makes it possible to set a different input current limit per phase. Note that, similar to the maximum charge current, the input current limit used by the system is multiplied by the number of units in the system.\\ (This multiplication is done automatically when using a remote panel to adjust the input current limit.)
   * UPS function on/off
-  * Power Assist settings
+  * PowerAssist settings
   * Accept wide input frequency range on/off
 The following settings need to made in each unit in the system:
@@ Line 87: / Line 106: @@
 Note that AES is only operational in stand-alone systems. Not in parallel and multi-phase systems.
 ==== Virtual switch ====
 A unique virtual switch configuration can be configured for each unit in the system. With the exception of the Ignore AC input function: configure that in the master of L1.
@@ Line 95: / Line 113: @@
   * PV Inverter Assistant needs to be loaded into each unit in the system.
   * The VE.Bus BMS and the Two-Signal BMS support Assistant also need to be loaded in each unit in the system.
-(nb: In some cases (depending on the choices made) slaves can left out, the assistant will notify you about this.)
+(nb: In some cases (depending on the choices made) slaves can be left out, the assistant will notify you about this.)
 With all the other Assistants: genset start/stop, relay locker etcetera, a unique configuration can be made in each unit.
-Tip: a quick way to load Assistants into each unit in the system is to save the settings after configuring the master in L1. Then open VEConfigure for an other unit and load that file. VEConfigure will automatically adapt the Assistants for the slaves. (note: In some cases you might get some warnings. Please step through the assistant in that case.)
+Tip: a quick way to load Assistants into each unit in the system is to save the settings after configuring the master in L1. Then open VEConfigure for another unit and load that file. VEConfigure will automatically adapt the Assistants for the slaves. (note: In some cases you might get some warnings. Please step through the assistant in that case.)
 ===== Tips and hints =====
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 ===== DISQUS =====
 ~~DISQUS~~