Mastervolt Mass Series User Manual

Mass 24/15-2, 24/25-2, 24/25-2 DNV, 24/25-2 (large cabinet) – User and Installation Manual
7
3 OPERATION
3.1 Introduction
The MASS battery charger is a full-automatic high efficiency
battery charger/rectifier, developed and produced by
Mastervolt. 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 is 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 is switched off by the ON/OFF switch.
WARNING!
Switching off the Mass Charger does not cut off
the connection to the batteries or the AC-source.
This means that voltages are still available inside
the apparatus.
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 at Bulk phase.
Fig. 2: Example: charge characteristic
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
See figure 3. On the front of the Mass Charger LED 9 to 13
represent the charging current. The more LEDs are
illuminated, the higher the charging current. LED 1-5
represent the charging state.
Illuminating
LEDs
Meaning
Normal operation, LED 6 illuminates green
1
Charger on, BULK stage
1+2
Uout> 27.6V
1+2+3
ABSORPTION, Uout = abs. (28.5V)
1+2+3+4
3 hrs after start max bulk timer,
or I < return amps
1+2+3+4+5
FLOAT, 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
LEDs in charge
stage, see fig. 5
charge
voltage (V)
charge
current (A)
charge time
BULK
ABSORPTION
FLOAT
Fig 3: Front panel of the battery charger

Mastervolt Mass Series Specifications

General

Output Voltage	12V / 24V / 48V
Cooling	Fan or Natural convection (depending on model)
Protection	Over temperature, Overload, Short circuit
Dimensions	Varies depending on model
Weight	Varies depending on model
Battery Types	Gel, AGM, Lithium-ion
Temperature Sensor	Yes
Parallel Operation	Yes
Input Voltage	90-265V AC
Operating Temperature Range	-20°C to +60°C