Ac Input Current Limit; Ups Feature; Dynamic Current Limiter; Auxiliary Ac Output (Ac-Out-2) - Victron energy MultiPlus Series Service Manual

AC input current limit

These are the current limit settings for which PowerControl and PowerAssist come into operation.
PowerAssit setting range:
From 6,3A to 50A.
Factory setting: the maximum value (50A).
See Section 2, the book 'Energy Unlimited', or the many descriptions of the unique PowerAssist feature on our website
www.victronenergy.com.
AC input current limit
These are the current limit settings for which PowerControl and PowerAssist come into operation.
PowerAssit setting range:
From 5,3A to 50A for models with 50A transfer capacity
Factory setting: the maximum value (50A).
See Section 2, the book 'Energy Unlimited', or the many descriptions of this unique feature on our website www.victronenergy.com.

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.
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.

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.
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