Version: 2020-09-04
159
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.)
Do values have to be adjusted in the web manager?
No, the BACS modules themselves always take care of one battery - the deviations that the connecting element generates because
more material that has to be measured are normally less important.In theory, you could change the existing BACS installation at any
time and integrate the cell connectors accordingly.
What can be achieved with this measurement setup - an idealized example system failure analysis
Basically, this measurement method ensures that both the battery and the transition to the next battery are checked.
In this way, if a current sensor in the string reports a deviating current flow, it is easy to spot the battery with the problem is to be sought
for:
With the internal rresistance measurement of the batteries, the connector is included: If the measured values reach questionable values,
the corresponding module will work independently and make itself noticeable.
Otherwise, the problem can be identified by evaluating the data situation:
The entire battery string provides strange fluctuations in the flow of electricity. In this example you can see an unusual internal
resistance in BACS module 2. The problem can be narrowed down as followed:
BACS-Modul 1 shows no problems:
As a result, all screws on battery 1 must be properly tightened. The same applies to the input screw of battery 2, since the connector is
measured via the BACS module 1. If this connector were loose, you would have to see it in the measurement results of BACS Module 1.
The same applies to BACS-Modul 3:
The measurement extends from the positive pole to the positive pole of the subsequent battery (i.e. battery 4) - so the input screw of the
connector coming from battery 2 must also be OK.
BACS module 2 reports a strange internal resistance
Likewise, there can be no problem with the incoming screw terminal from battery 3, since BACS module 3 monitors the incoming
terminal from battery 3 and the incoming terminal from battery 4.
There are only a few questions left:
a. Is the outgoing terminal of battery 2 was not attached properly?
b. Is there a problem with the connector between battery 2 and battery 3 itself?
c. Is the battery 2 itself has a defect?
If you want to be sure, you would now look at the temperature data of the 3 batteries and look for abnormalities:
If battery 2 heats up quickly during discharge / charge cycles and is then transferred to battery 3, the fault is clearly with battery No. 2.
However, if batteries 2 and 3 heat up evenly above average to the rest, the fault with the cell connector is possible - it heats up very
quickly and transfers the heat to the batteries via the battery poles.
Note:
Since the connectors are included into BACS, it is possible to general down times of the UPS and search for a problem - you know what
you are looking for. If several batteries are affected, this method allows a strategic overview to plan the maintenance work.
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