Victron energy MultiPlus-II 12/3000/120 Manuel page 16

UPS feature
If this setting is 'on' and AC on the input fails, the MultiPlus-II switches to inverter operation practically without interruption.
The output voltage of some small generator sets is too unstable and distorted for using this setting – the MultiPlus-II would continually
switch to inverter operation. For this reason, the setting can be turned off. The MultiPlus-II will then respond less quickly to AC input
voltage deviations. The switchover time to inverter operation is consequently slightly longer, but most equipment (most computers,
clocks or household equipment) is not adversely impacted.
Recommendation: Turn the UPS feature off if the MultiPlus-II fails to synchronise, or continually switches back to inverter operation.
Dynamic current limiter
Intended for generators, the AC voltage being generated by means of a static inverter (so-called 'inverter' generators). In these
generators, engine rpm is reduced in case of low load: this reduces noise, fuel consumption and pollution. A disadvantage is that the
output voltage will drop severely or even completely fail in the event of a sudden load increase. More load can only be supplied after the
engine is up to speed.
If this setting is 'on', the MultiPlus-II will start supplying extra power at a low generator output level and gradually allow the generator to
supply more, until the set current limit is reached. This allows the generator engine to get up to speed.
This setting is also often used for 'classical' generators that respond slowly to sudden load variation.
Weak AC
Strong distortion of the input voltage can result in the charger hardly operating or not operating at all. If WeakAC is set, the charger will
also accept a strongly distorted voltage, at the cost of greater distortion of the input current.
Recommendation: Turn WeakAC on if the charger is hardly charging or not charging at all (which is quite rare!). Also turn on the
dynamic current limiter simultaneously, and reduce the maximum charging current to prevent overloading the generator if necessary.
Note: when WeakAC is on, the maximum charge current is reduced by approximately 20 %.
BoostFactor
Change this setting only after consulting with Victron Energy or with an engineer trained by Victron Energy!
Programmable relay
The relay can be programmed for all kinds of other applications, for example as a starter relay for a generator.
Auxiliary AC output (AC-out-2)
Intended for non-critical loads and directly connected to the AC input. With current measurement circuit to enable PowerAssist.
5.3 Configuring the MultiPlus-II
The following hardware is required:
A MK3-USB (VE.Bus to USB) interface.
Alternatively, the Interface MK2.2b (VE.Bus to RS232) can be used (RJ45 UTP cable needed).
5.3.1 VE.Bus Quick Configure Setup
VE.Bus Quick Configure Setup is a software program with which systems with a maximum of three Multis (parallel or three phase
operation) can be configured in a simple manner.
The software can be downloaded free of charge at www.victronenergy.com.
5.3.2 VE.Bus System Configurator
For configuring advanced applications and/or systems with four or more Multis, VE.Bus System Configurator software must be used.
The software can be downloaded free of charge at www.victronenergy.com .
14