Installation - Mastervolt MASS 24/15-2 Betriebsanleitung

/
TECHNOLOGY

INSTALLATION

Phase 1: Main charge ("BULK")
The first step "BULK" starts after switching on the MASS
charger. In this phase, the charger supplies the maximum
current until the battery reaches 14.40V. The battery is
now 80% charged. When the battery reaches this limita-
tion area the charge current wil decrease. Bulk duration is
maximum 6 hours, depending on the battery's condition
and charge rate. The yellow "bulk" LED on the front panel
will light up during this phase.
Phase 2: "ABSORPTION"
The second step "ABSORPTION" begins automatically
with a voltage of 14.25V. The current consumption in the
absorption mode is depending on the capacity of the
batteries and will decrease slowly. The charger remains in
this "absorption" phase untill the charge current drops for
a periode of 15 minutes below 2.5A. If the charge current
will not drop below 2.5A, a clock will switch the "absorp-
tion" mode off after 6 hours. During the absorption phase
the yellow "ABSORPTION" LED on the front panel will
light up.
Phase 3: Trickle charge ("FLOAT")
The third stage, "FLOAT", starts when the "absorption"
phase has been completed. In the "float" mode, the char-
ger automatically switches back to a lower output voltage
of 13,25V. This voltage is sufficient to maintain the battery
at a 100% charge. During this phase, the capacity of the
charger can be entirely used for the supply of the users
connected to the battery. During this mode the yellow
"float" LED will light up. If necessary the charger automa-
tically switches back to the "absorption" mode.
Current consumption from mains or generator
The charger produces no phase shift, because the input
current follows the AC voltage waveform so a power
factor of 1.0 or "unity" is achieved. The shape of the input
current waveform is the same as the input voltage e.g.
sinusoïdal. Therefore the input current is very low compa-
red to conventional chargers.
Low ripple on output
The charger has a very low ripple on the output, which pre-
vents interference in the DC circuit. The ripple is less than
100 mV with maximum output current.
Automatic compensation of charge voltage with
battery temperature
If the temperature sensor is connected the MASS charger
will charge its output voltage -30mV/°C (12V) or -60mV/°C
(24V). The temperature sensor should give a good inter-
pretation of the battery temperature.
Automatic voltage sense compensation
The charger compensates automatically for the normal
voltage drop across the cable connection to the battery.
12
The charger has been programmed in such a way that a
seperate sense connection to the battery is not necessa-
ry.
CHARGING TWO OR MORE BATTERIES VIA
ONE OUTPUT
If two or more batteries need to be charged at the same
time and output, a battery isolator should be used. The
battery isolator divides the various battery sets from one
other, in order to avoid one set discharging the other. Be-
cause there is always a voltage drop across the isolator of
0,7V the output voltage needs to be compensated. You
can compensate this voltage drop by removing the "diode
compensation" jumper on the front panel.
CHARGING A CRANKING BATTERY
In certain situations, it may occur that in addition to the
main battery(ies) a cranking battery with the same voltage
is used. The battery charger can charge a cranking batte-
ry at the same time as the main battery, by using the 3A
output.
The second output has the same output voltage
as the main output, 3 Amps maximal !
THE BATTERY CHARGER AS FLOAT CHARGER
It is possible to use the charger as a "trickle" charger. The
charger then supplies a constant output voltage of 13.25V
(26.5V). For this mode you can remove a jumper on the
front.
SELECTION WET OR GEL BATTERIES
The optimal charge voltage for a wet lead acid battery dif-
fers from the gel battery. Therefore it is possible to switch
over to a higher float voltage (13.8V for 12V and 27.6V for
24V) necessary for gel batteries. You increase this output
voltage by removing a jumper on the front panel.
5 INSTALLATION
Install the MASS battery charger in a dry, well ventilated
area, as close as possible to the batteries. Although the
battey charger has a high efficiency, some heat will be
produced. This heat will be discharged by a fan with varia-
ble speed. At installation of the battery charger be sure
that:
• the air flow is not obstructed;
• no water and/or dust can enter the cabinet.
MOUNTING THE MASS CHARGER
The charger can be either horizontal or vertical mounted.
We recommend vertical, because the heat convection is
from bottom to top.
August 1999 / MASS battery charger / EN