20
IGB
OPERATING
BULK phase (constant current) - The batteries need more current than the battery charger
can supply. Current is limited to the maximum rated output. The battery charger can enter this
phase during start-up, when the batteries are low or when a high load is connected.
ABSORPTION phase (constant voltage) - The battery charger charges the batteries at a con-
stant ABSORPTION voltage and at the current they need.
The current needed by the batteries will tend to diminish over time. When the required current
is less than 20% of the maximum output value, the charger will change to the FLOAT phase.
FLOAT phase (maintenance) - The battery charger charges the batteries at the constant
FLOAT voltage. In this phase, as the batteries reach maximum capacity, they will tend to absorb
current close to zero Ampere. This FLOAT phase will allow the batteries to be on charge with-
out the risk of overloading. The next step to the ABSORPTION phase occurs when the demand
for current goes over 20% of the maximum output value.
HALF-POWER MODE
If the supply voltage of the equipment drops under 97 Vac the battery charger will activate the
“half power” mode. In this mode the battery charger can supply, a maximum value half of the
maximum nominal output current. In this way you can reduce the current absorption from the
AC supply. This feature is useful when the battery charger is supplied via a generator or from a
dock outlet with limited power output.
The half power mode can be activated manually by using the remote LCD terminal (optional).
CHARGING CHARACTERISTICS
Charging occurs in 3 phases:
OPERATION
When the battery charger is switched on for a short period, all the LEDS on the front panel will
light up. After that the battery charger will place itself in the optimum charging mode to best suit
the batteries or load connected. The battery charger has a loading characteristic of the IUoU type.
The MBC battery chargers can also be used as a power supply, that is, with batteries discon-
nected.
We suggest you use the battery charger in this mode only occasionally and not for ordinary
use. However, avoid connecting high inductive loads (e.g. high powered motors) with the bat-
teries disconnected as it you could cause damage to the equipment, even if rare to happen.
(V)
14.1 (28.2) [Gel 14.4 (28.8)]
(I)
Imax
20% Imax
BULK ABSORPTION FLOAT NEW CYCLE
TIME
TIME
13.5 (27.0) [Gel 13.8 (27.6)]
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