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3. Operation
3.1. On/Off/Charger Only Switch
When switched to 'on', the product is fully functional. The inverter will come into operation and the LED 'inverter on' will light up.
An AC voltage connected to the 'AC in' terminal will be switched through to the 'AC out' terminal, if within specifications. The
inverter will switch off, the 'mains on' LED will light up and the charger commences charging. The 'bulk', 'absorption' or 'float'
LEDs will light up, depending on the charger mode.
If the voltage at the 'AC-in' terminal is rejected, the inverter will switch on.
When the switch is switched to 'charger only', only the battery charger of the Multi will operate (if mains voltage is present). In this
mode input voltage also is switched through to the 'AC out' terminal.
NOTE: When only the charger function is required, ensure that the switch is switched to 'charger only'. This prevents the inverter
from being switched on if the mains voltage is lost, thus preventing your batteries from running flat.
3.2. Remote control
Remote control is possible with either a switch or with a Multi Control panel.
The Multi Control panel has a simple rotary knob with which the maximum current of the L1 AC input can be set. This does not
affect L2 AC input: see
PowerControl and PowerAssist in Section 2.
3.3. Equalisation and forced absorption
3.3.1. Equalisation
Traction batteries require regular additional charging. In the equalisation mode, the MultiPlus-II will charge with increased voltage
for one hour (1V above the absorption voltage for a 12V battery, 2V for a 24V battery). The charging current is then limited to 1/4
of the set value. The 'bulk' and 'absorption' LEDs flash intermittently.
Equalisation mode supplies a higher charging voltage than most DC consuming devices can cope with. These
devices must be disconnected before additional charging takes place.
3.3.2. Forced absorption
Under certain circumstances, it can be desirable to charge the battery for a fixed time at the absorption voltage level. In Forced
Absorption mode, the MultiPlus-II will charge at the normal absorption voltage level during the set maximum absorption time. The
'absorption' LED lights.
3.3.3. Activating equalisation or forced absorption
The MultiPlus-II can be put into both these states from the remote panel as well as with the front panel switch, provided that all
switches (front, remote, and panel) are set to 'on' and no switches are set to 'charger only'.
In order to put the MultiPlus-II in this state, the procedure below should be followed.
If the switch is not in the required position after following this procedure, it can be switched over quickly once. This will not change
the charging state.
Switching from 'on' to 'charger only' and back, as described below, must be done quickly. The switch must be
toggled such that the intermediate position is 'skipped', as it were. If the switch remains in the 'off' position
even for a short time, the device may be turned off. In that case, the procedure must be restarted at step 1.
A certain degree of familiarisation is required when using the front switch on the Compact in particular. When
using the remote panel, this is less critical.
Procedure:
1. Check whether all switches (i.e. front switch, remote switch or remote panel switch if present) are in the 'on' position.
2. Activating equalisation or forced absorption is only meaningful if the normal charging cycle is completed (charger is in 'Float').
3. To activate:
a. Switch rapidly from 'on' to 'charger only' and leave the switch in this position for ½ to 2 seconds
Page 6
MultiPlus-II 12V/24V/48V 3kVA 120V
Operation
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