Victron energy VE Bus Multi Manual página 6

2. Installation
Without external transfer switch
Installation of the VBMC in a VE.Bus system without external transfer relay is really only a matter
of connecting the interface cable. No special setup of the VBMC is needed. Scaling to the system
is done automatically.
(In the unlikely situation that the VBMC is set to a higher limit than is allowed for the system, the
system maximum is automatically taken. For example: In a system with a 30A VBMC in
combination with a 16 A Multi the shore current maximum is limited to 16A. Even in the case that
the VBMC is set to 25A.)
With external transfer switch
This paragraph deals with systems with 2 AC inputs built with a non-intelligent external transfer
switch. This paragraph can be skipped if you have a system with more than one AC input build
with VE.Bus. (For instance by using Quattro's or by using Multis with the extended VE.Bus
functionality.)
If an external transfer switch is placed before the Multis then this switch determines which AC
source is used. The Multis do not have any information about the state of the switch. The VBMC
provides a way to specify different current limits for both AC sources.
To achieve this, the VBMC must have information about the state of the external transfer switch.
For this purpose a screw connector is placed at the backside of the VBMC.
Normally the VBMC will send the current set point as determined by the knob to the Multis. If
however the terminals of this screw connector are short circuited the VBMC sends a preconfigured
current limit to the Multis. Because this functionality is mainly used to connect a generator this
preconfigured current limit is called 'generator current limit' throughout this manual. Paragraph 4
describes how this limit can be changed.
The two terminals of the screw connector are to be connected to the external transfer switch. An
auxiliary relay of the external transfer switch is most common place to do so. Refer to the transfer
switch manual for more information.
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