OPERATION
EN / Mass Charger 12/60-2; 12/80-2; 24/50-2; 24/75; 24/100; 3-24/100; 48/25; 48/50 / July 2010 7
3 OPERATION
3.1 INTRODUCTION
The MASS battery charger is a full-automatic high
efficiency battery charger/rectifier, developed and
produced by Mastervolt Amsterdam. The MASS series
features a family of advanced quality battery chargers. The
Mass Charger not only charges batteries rapidly and
safely, it supplies the connected consumers at the same
time. In addition, the Mass Charger is secured against
short circuit, overload and high temperatures in an
industrial environment.
3.1.1 Switching on
The battery charger will be switched on by the ON/OFF
switch. One of the front LEDs will light up now and the
charging starts immediately.
3.1.2 Switching off:
The battery charger will be switched off by the ON/OFF
switch.
The connection between the mains and the
battery charger will not be severed with the
switch.
3.2 THEORY OF OPERATION
The battery charger is equipped with an intelligent 3-stage
charge characteristic which takes care of an optimal
charge of your batteries (see fig. 2). When switched on,
the Mass Charger always starts in Bulk phase.
Fig. 2: Example: charge characteristic MASS 12/60-2.
(For other models V/A according to specifications).
To prevent your batteries from overcharging a new cycle
only starts when the battery voltage has been under the
level of 12.8/25.6 or 51.2V for longer than 30 seconds or
after a hard reset by switching the on/off switch back and
forward.
3.3 FRONT PANEL
On the front of the Mass Charger a so called "capacity
meter" (figure 3, LED 9 to 13) gives you information about
the battery state like a fuel meter of a car. The more LEDs
are illuminated the more power is in the battery.
Illuminating LED’s Meaning
Normal operation, LED 6 illuminates green
1 Charger On
1+2 Uout> 13.8/27.6/55.2V
1+2+3 Uout = abs. (14.25/28.5/57.0V)
1+2+3+4 3 hrs after start max bulk timer,
or I < return amps
1+2+3+4+5 6 hrs after start max bulk timer,
or I < return amps for 15 min or longer
9 Charge current 0-5% of full current
9+10 Charge current 5-25% of full current
9+10+11 Charge current 25-50% of full current
9+10+11+12 Charge current 50-75% of full current
9+10+11+12+13 Charge current 75-100% of full current
6 Green: normal operation, Red: fault
condition, Off: standby or off
7 Green: MasterBus communication,
Off: no MasterBus communication
Fault condition, LED 6 illuminates red
6 red +1 Battery sense error
6 red +2 Charger temperature too high
6 red +3 Short circuit indication, charger will
reduce the charge current to 25%
6 red +4 DC error, DC voltage too low or too high
6 red +5 Temperature sense error
Fig 3: Front panel of the battery charger
LEDs in charge
stage, see fig. 3
charge
voltage (V)
charge
current (A)
charge time
BULK ABSORPTION FLOAT
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