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multiplus_faq [2018-12-22 21:49]
guy_stewart Removed LOM questions
multiplus_faq [2019-10-08 03:25] (current)
guy_stewart
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 **AC low disconnect:​** low limit: below this value, the MultiPlus will disconnect (default = 180Vac). **AC low disconnect:​** low limit: below this value, the MultiPlus will disconnect (default = 180Vac).
  
-On generators where the output voltage drops under load, setting this value to a higher value can help solve shutdowns on overload.+On generators where the output voltage drops under load, setting this value to a higher value can help resolve inverter ​overload ​shutdowns.
  
-**AC Low connect:** minimum value: at this value or any higher value, ​the MultiPlus ​will reconnect after having disconnected (default = 187Vac).+The reason ​this happens is that the Multi will synchronise and follow the generator voltage as it sags.
  
 +If the generator is disconnected under load (either due to low-voltage disconnection,​ stalling, lack of fuel, etc) then when the Multi switches back to inverter mode; it must immediately supply all the power required by the loads at that same low voltage (and subsequent higher current).
 +
 +As overload is driven by current, not power, this can result in an overload.
 +
 +By increasing this minimum voltage level, you tell the inverter/​charger switch to inverter mode sooner, at higher voltage and thus lower AC current, and potentially prevent the overload from occurring.
 +
 +**AC Low connect:** minimum value: at this value or any higher value, the MultiPlus will reconnect after having disconnected (default = 187Vac).
 ===== 1.4 Maximum voltage levels ===== ===== 1.4 Maximum voltage levels =====
  
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 ===== 1.5 Loss of mains detection (LOM) ===== ===== 1.5 Loss of mains detection (LOM) =====
 +
 +Loss of mains detection will push and pull at voltage and frequency to see if there is still a generating source. This process can cause issues with some generators, or high impedance connections to generators. ​
 +
 +For large and stable Generators Type B LOM will work, and is safer.
 +However, if you are experiencing issues with voltage, frequency or power fluctuations,​ you may wish to try Disabling LOM.
 +
 +**Disabling LOM**
 +
 +Disabling the LOM on an input connected to the grid is only allowed when other external safety equipment is installed.
 +Disabling the LOM on an input connected to generator can be done, but then other methods / warning signs / physical lockout safety measures must be provided. Ensuring that any installer that will work on the generator, wiring or system, will make sure to also switch off or otherwise disconnect the Inverter/​charger system.
  
 For Full information on Loss of Mains detection, please see [[ve.bus:​grid-codes-and-loss-of-mains-detection|this more detailed explanation.]] For Full information on Loss of Mains detection, please see [[ve.bus:​grid-codes-and-loss-of-mains-detection|this more detailed explanation.]]
  
  
-===== Example configuration in VEConfigure ​=====+**Example configuration in VEConfigure**
  
   * A generator that requires LOM to be disabled.   * A generator that requires LOM to be disabled.
   * Generator on AC in 1, and grid on AC in 2, as recommended.   * Generator on AC in 1, and grid on AC in 2, as recommended.
  
-{{ :ve.bus:grid-code.png?direct |}} +{{::lom_generator.jpg?direct&400|}}
  
  
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 {{:​veconfigure:​charger_tab.jpg?​nolink&​400|}} {{:​veconfigure:​charger_tab.jpg?​nolink&​400|}}
  
-**Derating of the power factor**+===== 3.1 Derating of the power factor ​=====
  
 Some generators have a waveform which makes it difficult to charge with the normal charge mechanism. Through activating the "​**Weak AC input**"​ function, another mechanism is used which will enable the MultiPlus to charge under practically any condition. Some generators have a waveform which makes it difficult to charge with the normal charge mechanism. Through activating the "​**Weak AC input**"​ function, another mechanism is used which will enable the MultiPlus to charge under practically any condition.
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 A detailed description of all settings is available in the VE-Configure help menu, and more instructions are available in our manuals. A detailed description of all settings is available in the VE-Configure help menu, and more instructions are available in our manuals.
 +
 +====== 4. In the “Inverter” tab of VE-Configure:​ ======
 +
 +===== 4.1 PowerAssist =====
 +
 +The [[https://​www.victronenergy.com/​upload/​documents/​White-paper-Achieving-the-impossible-EN.pdf|PowerAssist feature]] can be extremely useful, however it restricts the minimum AC input current limit and this may exceed your generators ability to supply. The [[https://​www.victronenergy.com/​blog/​2018/​04/​20/​multiplus-quattro-inverter-chargers-improved-current-limits/​|exact restriction varies between models - see here for the list.]]
 +
 +If you have a small generator and have trouble getting connected or staying connected, Disable PowerAssist to allow the device to reduce the AC input current limit. ​
 +
 +
 +
 +====== Still not connecting? ======
 +
 +If the unit is still not connecting, switch the Multi over to Charger only mode. 
 +
 +Try with a different generator.
 +
 +There can be issues with generators with Residual Current Devices (RCD'​s),​ control electronics or circuit breakers. There is some discussion about troubleshooting these issues on this [[https://​community.victronenergy.com/​questions/​1702/​multiplus-with-generator-and-residual-current-devi.html|Victron Community Question - Multiplus With Generator And Residual Current Device]], however as troubleshooting and correcting these faults have serious safety implications,​ they are best discussed with a local installer who has appropriate electrical qualifications,​ or your Victron Dealer.
 +
 +
 +If there is still no connection, contact your dealer or distributor. Tell them the steps that you have taken already to attempt to get it to work and they can help from there.
  
  
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 [[https://​community.victronenergy.com/​topics/​generator.html|Victron Community Questions and Answers about generators.]] [[https://​community.victronenergy.com/​topics/​generator.html|Victron Community Questions and Answers about generators.]]
 +
 +[[https://​www.victronenergy.com/​upload/​documents/​Honda%20white%20paper%20GB.pdf|Victron Inverter/​Chargers and Honda Generators]]
 +
 +[[https://​www.victronenergy.com/​blog/​2018/​04/​20/​multiplus-quattro-inverter-chargers-improved-current-limits/​|MultiPlus & Quattro Inverter/​Chargers:​ Minimum AC Input Current Limits]]
 +
  
  
  
-===== Disqus ​=====+===== DISQUS ​=====
 ~~DISQUS~~ ~~DISQUS~~
multiplus_faq.1545511756.txt.gz · Last modified: 2018-12-22 21:49 by guy_stewart