Outback Power Systems vfx 3232m Benutzerhandbuch

                              

Copyright 2003  



  OutBack Power Systems, Inc. 

 

    

900-0027-1

                                                                19009 62

nd

 Ave NE, Arlington   WA 98223 USA                     

Page 32                                         

Rev 7.2

       08/26/05                                                                    Tel 360 435 6030    Fax 360 435 6019  

General 

How it works: With no AC input signal present, the FX inverter’s Neutral Output is tied to Chassis Ground and hence to the Boat or RV 
Ground.  This is similar to any Home installation where one conductor (Neutral for the US) must be grounded.  When an AC input is 
applied and the inverter allows it to transfer, the Neutral Output to Ground bond within the inverter is broken.  The Neutral Output line is 
then connected to the Input’s Neutral and also the Ground of the Input source.  At this point the FX inverter is using the Ground 
supplied by shore power or the generator as its Neutral to Ground bond and this Ground becomes the inverters Ground. 

The Master will be configured normally where the AC Input’s Ground is connected to the bussed GND-NEU connection of the FX 
inverter.  The slave inverters must have the buss removed and the Ground of the AC Input must be connected directly to the Chassis 
Ground of the inverter.  The reason for this configuration is that if each inverter has a bussed Neutral to Ground bond and any inverter 
transfers sooner than the rest, the remaining inverters will have a different Neutral to Ground bond (One to the mobile Ground rather 
than shore Ground).  In this case there will be multiple Neutral to Ground bonds and the GFP breaker may blow if a noticeable voltage 
is present.  By removing the Neutral to Ground buss this problem is eliminated. 

Mobile FX inverter/chargers limit the AC input current to 30 amps.  Outback Power has decided to do this because they use only on of 
the three poles of the input relay within the FX.  In a non-mobile FX, all three poles are used and can therefore carry three times the 
current (theoretically, since they are paralleled this limit decreases).  The mobile FX uses two poles of this relay for ground switching, 
so only one pole is available.  Due to this fact, we recommend a 30 amp breaker for the AC input to the FX.