Version: 2020-09-04
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TEL +49(40)22692910 - EMAIL generex@generex.de - WEB www.generex.de (This and all other product datasheets are available for download.)
1. The total voltatge for all batteries drops.
2. Measured from the UPS to the center tab at the negative string will indicate the missing string voltage.
3. Measured from the center tab back to the UPS on the positive side shows that all batteries work as desired.
Ideally, a UPS can show itself in which battery site a problem could generally exist - there is no need of inspecting all batteries.
Where the problems with the UPS start
A UPS has a blind spot. Although it can measure the differences, dealing with the measurements is a litte bit limited:
Since batteries age individually even with the same type of use, the measurement data of the two strings will drift apart at the latest with
the natural aging process. As soon as a certain threshold value is exceeded, a UPS system reports a general battery fault, but usually
too late:
It is no longer possible to estimate how many batteries have hidden defects due to the imbalance. Most of the time the UPS fails due to
the hidden drifting process in an unfortunate moment.
The CS141 can monitor precisely these “hidden drift processes” and issue warnings and alarms in good time if there are questionable
values, thus providing the responsible maintenance staff with valuable additional time windows for maintenance work.
CS141 settings
For this settings, you need to use a UPS with a center tap.
For setting up this special function, navigat to the following menus:
This configuration menu is a little bit unusual: On the one hand it is a UPS menu, on the other hand there is a limited purpose how to
use this function. Therefore, it was filed under the custom thresholds..
Note:
This configuration only makes sense if you explicitly use a UPS a center tap is used. Since we are anticipating something at this point,
we will only deal with this one aspect of the custom thresholds at this point - further information can be found in this manual in the
chapter "Custom Thresholds".
First click on Custom Thresholds in the UPS configuration menu and enable this function:
This option enables the monitoring of the general voltage difference - The CS141 looks at both string voltages and determines the
general difference between them. If the argument "greater than" applies, an alarm condition exists. This alarm condition is a UPS event
to which jobs can be assigned to.
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