Version: 2020-09-04
192
Copyright of the European Union is effective (Copyright EU) (c) 2019 GENEREX Systems GmbH, Hamburg, Germany, All rights reserved
TEL +49(40)22692910 - EMAIL generex@generex.de - WEB www.generex.de (This and all other product datasheets are available for download.)
Attention:
Each battery manufacturer uses an own measuring method to get the impedance values for a data sheet. As a consequence, it is
possible that taking impedance values from the battery manufacturer's data sheet is not suitable to configurate BACS thesholds:
To ensure save operation, determine impedance values for BACS as described in this manual.
Maximum Voltage deviation between batteries
Batteries must be used regularly, the charge / discharge process is very important for optimal operation.
Despite equalizing / balancing, an unused battery loses its target voltage over time, although it receives a trickle charge from the UPS.
This is a natural process and not a malfunction:
If the fluids in the battery come to rest, gravity affects the fluids inside the battery:
Basically, liquids of different molecular weight in a standing system tend to be arranged according to their molecular weight over time.
The heavy liquid slowly sinks down while the light liquid migrates upwards. As a consequence, the overall concentration ratio of liquids
changes, which impairs the efficiency. How much this natural process will take effect, depends strongly on the chemicals used as well
as the size of a battery - as bigger the battery as stronger this phenomenon will take effect.
The target voltage can be normalized by regular battery use due to the fact the chemical processes cause a circulation and even
distribution of all chemicals. The BACS Webmanager can measure the deviation in 0.1-volt increments and give an indication if the
measured voltage and the target voltage are too drifting apart.
Voltage deviation per string
This feature is similar to comparing individual BACS voltage measurements. However, this function compares the individual strings
within a BACS installation.
Current deviation per string
Unlike the voltage, the charging current divides evenly into the different strings - but the total current will not change. Since all battery
strings work evenly in the network, defects in one string will have a negative impact on all strings. BACS can be adviced to measure this
effect and give feedback to technical staff.
Please note, this setting requires current sensors on each string
Note
What is the difference between warning and alarm?
BACS distinguish between a definitive alarm that requires intervention and a warning:
Both states are quite similar, the different jobs can be freely defined for the corresponding warning or alarm level. Depending on optional
parts and devices attached to BACS as well as the configuration, very delicate automatic processes can be initiated, ranging from
information to the initiation of active emergency measures up to switching and controlling of systems, etc.
In the event of an alarm condition, the acoustic alarm is additionally activated, the alarm LED changes its status and the alarm contact
on the BACS Webmanager is actively opened.
The values are freely definable, but care should be taken to ensure that the values for the warning are always reached well in advance
of the values for an alarm so that there is still enough time for an adequate response.
Alarm Delay
As a consequence of a used emergency power or an extended battery test, battery voltage is in low condition. If the UPS takes the
maximum time for autonomous operation, it possible that the minimum values for the BACS alarm will be triggered.
This option allows to set up an alarm time delay to prevent BACS from sending a false alarm.
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