Problem Cause Solution
The charger does not
operate.
‘Bulk’ LED flashes and
‘Mains on’ LED illuminates
MultiPlus-II is in ‘Bulk protection’
mode thus, the maximum bulk
charging time of 10 hours is
exceeded.
Such a long charging time could
indicate a system error (e.g. a
battery cell short-circuit).
Check your batteries.
You can reset the error mode by
switching off and back on the
MultiPlus-II.
The standard MultiPlus-II factory setting of the ’Bulk
protection’ mode is switched on. The ‘Bulk
protection’ mode can be switched off with help of
VEConfigure only.
The battery is not
completely charged.
Charging current excessively high,
causing premature absorption
phase.
Set the charging current to a level between 0.1 and
0.2 times the battery capacity.
Poor battery connection. Check the battery connections.
The absorption voltage has been
set to an incorrect level (too low).
Set the absorption voltage to the correct level.
The float voltage has been set to an
incorrect level (too low).
Set the float voltage to the correct level.
The available charging time is too
short to fully charge the battery.
Select a longer charging time or higher charging
current.
The absorption time is too short.
For adaptive charging this can be
caused by an extremely high
charging current with respect to
battery capacity, so that bulk time is
insufficient.
Reduce the charging current or select the ‘fixed’
charging characteristics.
The battery is
overcharged.
The absorption voltage is set to an
incorrect level (too high).
Set the absorption voltage to the correct level.
The float voltage is set to an
incorrect level (too high).
Set the float voltage to the correct level.
Poor battery condition. Replace the battery.
The battery temperature is too high
(due to poor ventilation, excessively
high environmental temperature, or
excessively high charging current).
Improve ventilation, install batteries in a cooler
environment, reduce the charging current, and
connect the temperature sensor.
The charging current
drops to 0 as soon as the
absorption phase initiates.
The battery is over-heated (>50°C) • Install the battery in a cooler environment
• Reduce the charging current
• Check whether one of the battery cells has an
internal short circuit
Defective battery temperature
sensor
Disconnect the temperature sensor plug in the
MultiPlus-II. If charging functions correctly after
approximately 1 minute, the temperature sensor
should be replaced.
7.2. Special LED indications
(for the normal LED indications, see section 3.4 [6])
‘Mains on’ flashes and there
is no output voltage
The device is in ‘charger only’ operation and mains supply is present. The device rejects the
mains supply or is still synchronising.
Bulk and absorption LEDs
flash synchronously
(simultaneously).
Voltage sense error. The voltage measured at the voltage sense connection deviates too
much (more than 7V) from the voltage on the positive and negative connection of the device.
There is probably a connection error.
The device will remain in normal operation.
If the "inverter on" LED flashes in phase opposition, this is a VE.Bus
error code (see further on).
MultiPlus-II 48V 3kVA 120V
Page 21 Error Indications
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