Data Sheet

UB10.241
U–Series
24V, 10A, DC-UPS
Mar. 2019 / Rev. 1.3a DS-UB10.241-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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27.3. USING THE INHIBIT INPUT
The inhibit input disables buffering. In normal mode, a static signal is required. In buffer mode, a pulse with a
minimum length of 250ms is required to stop buffering. The inhibit is stored and can be reset by cycling the input
voltage.
For service purposes, the inhibit input can also be used to connect a service switch. Therefore, the inhibit signal can
be supplied from the output of the DC-UPS.
Fig. 27-3 Wiring example for inhibit input
DC-
UPS
UB10.241
IN
24V
OUT
24V
Signal Port
BAT
12V
Power
Supply
N L
PE
+ -+ -
Buffered
Load
+
-
+ -+ - +
-
Input
Output
+ -
Inhibit
+
-
12V
Battery
Service
Switch
27.4. TROUBLESHOOTING
The LEDs on the front of the unit and relay contacts indicate about the actual or elapsed status of the DC-UPS. Please
see also chapter 14.
The following guidelines provide instructions for fixing the most common failures and problems. Always start with
the most likely and easiest-to-check condition. Some of the suggestions may require special safety precautions. See
notes in section 25 first.
“Check wiring” LED is on Check correct wiring between the battery and the DC-UPS
Check battery fuse. Is the battery fuse inserted or blown?
Check battery voltage (must be typically between 7.4V and 15.1V)
Check input voltage (must be typically between 22.8V and 30V)
Check battery polarity
DC-UPS did not buffer Inhibit input was set
Battery did not have enough time to be charged and is still below the deep discharge
protection limit.
DC-UPS stopped buffering Buffer time limiter stopped buffering  set buffer time limiter to a higher value
Deep discharge protection stopped buffering  use a larger battery, or allow
sufficient time for charging the battery
Output was overloaded or short circuit  reduce load
Output has shut down Cycle the input power to reset the DC-UPS
Let DC-UPS cool down, over temperature protection might have triggered.
DC-UPS constantly switches between normal mode and buffer mode
The supplying source on the input is too small and can not deliver sufficient current
 Use a larger power supply or reduce the output load