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T A N K & B A T T E R Y M O N I T O R T B M
V1.1 - May 2010
Page 9
ADJUSTING THE ALARM OF THE ADDITIONAL BATTERIES
The TBM supervises the battery voltage of the groups of batteries of 2 and 3 and produces an alarm, if the
battery voltage falls for a fixed time (4min) under an adjustable value. A warning appears in the display and at
the same time a buzzing signal will sound, which can be acknowledged by you.
The pre-setting for the voltage alarm amounts to 11.5V. If the battery is strongly discharged, then the tension
alarm can be stopped somewhat lower, for example to 10.8V. If different battery systems (12V/24V) are
connected, the thresholds have to be adapted according to the rated voltages.
If no groups of batteries 2 and/or 3 are attached, then the alarm threshold can be arbitrarily adjusted, because
the TBM recognise that and it cannot cause an alarm.
5. OPERATION
The voltage and current of the main battery will be under constant survey of the TBM software. The TBM recog-
nizes, if the battery is fully charged or completely discharged. The values of the battery capacity
and the charging efficiency factor (CEF) were adjusted at each cycle to get the most exact indication of the
capacity.
THE MAIN BATTERY IS CLASSIFIED AS COMPLETELY LOADED (100%), IF:
1) all taken amp hours are back charged into the battery
2) the charging voltage has reached (normally adjusted to 13.6/27.2V)
3) the charging current sinks under 2% of the preselected battery capacity (e.g. 100Ah x 2% = 2A)
If all specified parameters (1, 2 and 3) are fulfilled for 4minutes, then the value is put back for the used up
ampere-hours to 100%. Then the charging efficiency factor is calculated by the actual cycle and the average
of the past 4 cycles. This new value is the calculation basis of the next cycle.
THE MAIN BATTERY IS CLASSIFIED AS COMPLETELY DISCHARGED (0%), IF:
the voltage of the main battery measured by the shunt goes for a certain time (30sec - 3min) under a voltage,
which is given by the software. In that case the determined capacity of this discharging cycle is the base for the
new battery capacity. To compensate the variation, the average is made over the actual and the last cycle.
Then a warning appears “Battery 1 empty” and at the same time a buzzing signal is sounding, which can be
acknowledged by you.
If no current is measured for min. 24 hours, the TBM goes to the sleep mode (Display off). As soon as a
current will be measured (delay max.1 min) the TBM switches on automatically.
Alternatively the TBM can be activated by pressing a button.
All these functions are automatic and do not need any external adjustment.
SELF-DISCHARGING OF A BATTERY
Because each lead-battery discharges itself internal, that amount cannot be registered by the shunt and TBM.
Hence the battery has to be synchronised again if the battery isn`t used for a long time (>1 month).
The only thing you have to do is to charge the battery completely again. The TBM will recognise the full
charging automatically.
If a new main battery set is used, then the number of cycles and the number of deep-dischargings must be set
to zero. In the SETUP menu the menupoint "deep discharge" must be called and the plus button has to be
pressed for 10 seconds. Subsequently, the two values are set to zero.