Datasheet

UB10.242
U–Series
24V, 10A, DC-UPS
12. CHECK WIRING AND BATTERY QUALITY TESTS
The DC-UPS is equipped with an automatic “Check Wiring” and “Battery Quality” test.
“Check Wiring” test:
Under normal circumstances, an incorrect or bad connection from the battery to the DC-UPS or a missing (or blown)
battery fuse would not be recognized by the UPS when operating in normal mode. Only when back up is required
would the unit not be able to buffer. Therefore, a “check wiring” test is included in the DC-UPS. This connection is
tested every 10 seconds by loading the battery and analyzing the response from the battery. If the resistance is too
high, or the battery voltage is not in range, the unit displays “Check Wiring” with the red LED. At the same time the
green “Ready” LED will turn off.
“Battery Quality” or “State of Health” (SoH) test:
The battery has a limited service life and needs to be replaced in a fixed interval which is defined by the specified
service life (acc. to the Eurobat guideline), based on the surrounding temperature and the number of
charging/discharging cycles. If the battery is used longer than the specified service life, the battery capacity will
degrade. Details can be found in chapter 28.1. The battery quality test can not determine a gradual loss in capacity.
However, it can detect a battery failure within the specified service life of the battery. Therefore a battery quality test
is included in the DC-UPS.
A battery problem is indicated with the yellow LED (replace battery pattern) and the relay contact “Replace Battery”.
Please note that it can take up to 170 hours (with the largest size of battery) until a battery problem is reported. This
should avoid nuisance error messages as any urgent battery problems will be reported by the “Check Wiring” test
and create a warning signal.
When “Replace battery” is indicated, it is recommended to replace battery as soon as possible.
13. END-OF-CHARGE VOLTAGE
The end-of-charge voltage depends on the temperature of the battery. A too high end-of-charge voltage can
damage the battery and shorten its lifetime. Therefore, the DC-UPS has an internal temperature sensor included,
which regulates the end-of-charge voltage depending of the battery temperature. To achieve the longest lifetime,
the battery should be placed at a coldest location.
The temperature difference between the DC-UPS and the battery requires a correction of the end-of-charge voltage.
This can be done with the selector on the front side of the unit. For details see chapter 15.
Oct. 2009 / Rev. 1.0 DS-UB10.242-EN
All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
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