Victron energy MultiPlus 12/5000/200 Manuel page 15

UPS feature
If this setting is 'on' and AC on the input fails, the MultiPlus switches to inverter operation practically without interruption. The MultiPlus
can therefore be used as an Uninterruptible Power Supply (UPS) for sensitive equipment such as computers or communication
systems.
The output voltage of some small generator sets is too unstable and distorted for using this setting – the MultiPlus would continually
switch to inverter operation. For this reason, the setting can be turned off. The MultiPlus 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 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, rpm is down-controlled if the load is low: 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 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.
WeakAC
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%.
Not adjustable with DIP switches.
BoostFactor
Change this setting only after consulting with Victron Energy or with an engineer trained by Victron Energy!
Not adjustable with DIP switches.
Auxiliary AC output (AC-out-2)
Besides the uninterruptable output, a second output (AC-out-2) is available that disconnects its load in the event of battery operation.
Example: an electric boiler or air conditioner that is allowed to operate only if the genset is running or shore power is available.
In case of battery operation, AC-out-2 is switched off immediately. After the AC supply has become available, AC-out-2 is reconnected
with a delay of 2 minutes, this to allow a genset to stabilise prior to connecting a heavy load.
Three programmable relays
The MultiPlus is equipped with 3 programmable relays. The relays can be programmed for all kinds of other applications, for example as
a starter relay for a generating set. The default setting of the relay in postion I (see appendix A, upper right corner) is 'alarm'.
Not adjustable with DIP switches.
Two programmable analog/digital input/output ports
The MultiPlus is equipped with 2 analog/digital input/output ports.
These ports can be used for several purposes. One application is communication with the BMS of a lithium-ion battery.
Not adjustable with DIP switches.
Frequency shift
When solar inverters are connected to the output of a Multi or Quattro, the excess solar energy is used to recharge the batteries. Once
the absorption voltage is reached, the Multi or Quattro will shut down the solar inverter by shifting the output frequency 1Hz (from 50Hz
to 51Hz for example). Once battery voltage has dropped slightly, the frequency returns to normal and the solar inverters will restart.
Not adjustable with DIP switches.
VEConfigure software
With VEConfigure software the relay can also be programmed for other purposes, for example to provide a generator starting signal.
With VEConfigure, several other special application modes of operation can be programmed.
Example: A house or an office connected to the public mains, fitted with solar panels with energy storage in batteries.
The batteries are used to prevent return delivery to the mains. During the day, redundant solar energy is stored in
batteries. This energy is used in the evenings and at night. An energy shortfall is compensated by the mains. The
MultiPlus converts the battery DC voltage to AC. The power is always less than or equal to the power consumption, so
that return delivery to the mains does not occur. In the event of mains failure, the MultiPlus isolates the premises from
the mains, which become autonomous (self-sufficient). In this way, a solar energy installation or a combined micro-scale
heating and power plant can be economically used in areas with an unreliable mains supply and/or financially
unfavourable energy-return conditions.
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