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AMATRONIC
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42
CENTRIC 3x480, User Guide, rel. 1.7
7.2.4.2.4
S
ET BATTERY CURRENT LIMIT VALUE
Use this function to set a limit for the battery output current. There are two options:
•
set maximum battery current to 0.1 x battery capacity.
•
set maximum battery current to 0.2 x battery capacity.
7.2.4.2.5
M
INIMUM DC VOLTAGE AT CURRENT LIMIT
Use this function to set a minimum value for the battery-charging voltage when current limiting is in effect.
The factory setting of 340 Vdc is recommended for most situations.
7.2.4.3
END-OF-BACKUP VOLTAGE LIMIT
During a mains power blackout, the batteries provide power to the UPS’s inverter. In the process, the
battery voltage continually decreases. The “End-of-backup voltage limit” lets you define how low you want
to let the battery voltage go before the UPS shuts down.
This function enables you to define the battery voltage at which the UPS will cease to provide backup
power and will shut itself down. This helps avoid overly-deep battery discharge, which shortens battery life.
The voltage limit is expressed in terms of volts per battery block. The normal voltage of a battery block is
between 12 and 13.5 volts. The end-of-backup battery voltage limit can be from 9 to 11 volts per battery
block. The Centric computes the average voltage per battery block, based on 40 cells.
7.2.4.4
BATTERY FLOATING VOLTAGE
This is the charging voltage. It is expressed as volts per battery cell. The factory default value is 13.5 V.
This is the recommended value for practically all situations.
7.2.4.5
BATTERIES PER CABINET
For this parameter, specify the number of batteries in the “negative” battery cabinet and the number of
batteries in the “positive” battery cabinet.
Explanation:
The UPS’s batteries are divided into two groups, which are housed in two battery cabinets.
One of the cabinets provides the negative (“–“) side of the total battery voltage; the other cabinet provides
the positive (“+”) side of the total battery voltage.
7.2.4.6
SETUP > BATTERY > BATTERY CAPACITY IN AH
Use this function to tell the
Centric
the total capacity (in ampere/hours) of the connected battery strings.
This total battery capacity figure is used by the
Centric
in three ways:
•
To provide an estimate of the remaining battery time, when the system is in battery mode.
•
To calculate the battery current limit.
•
To calculate the duration of the battery test.
If you do not know your battery capacity, look at one of the battery cells. The Ah rating of a battery cell is
usually indicated on the outside of the cell. This same number is your battery capacity.
7.2.4.7
SETUP > BATTERY > BATTERY TEMPERATURE CONTROL
These functions are related to battery temperature compensation, a process that monitors the battery
temperature and adjusts the charging voltage to avoid overcharging the battery. This prolongs battery life.
7.2.4.7.1
S
ETUP
>
B
ATT
.
>
B
ATT
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T
EMP
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C
NTL
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>
TEMP
SENSORS
YES/NO
Indicate whether battery temperature sensors are present or not. Battery temperature sensors are required
if one wishes to make use of battery temperature compensation.
