UB10.242

U–Series

24V, 10A, DC-UPS

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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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.

As long as the inhibit signal is active in normal mode, an internal relay contact will be opened and the battery will

not longer be charged.

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. 28-3 Wiring example for inhibit input

24V

Power

Supply

-

DC-UPS

UB10

24V

IN

24V

OUT

12V

BAT

-

-

-

Signal Port

+ -

12V

Battery

Module

-

Buffered

Load

-

Service

Switch

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 15.

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 26 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

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

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