Datasheet

PRELIMINARY
UB20.241
U–Series
24V, 20A, DC-UPS
14. FRONT SIDE USER ELEMENTS
A Signal Port
Plug connector with screw terminals, inserted from the surface.
Connections for the Ready, Buffering, Replace Battery relay contacts
and for the Inhibit input. See details in chapter
13.
B Power Port
Screw terminals, connection for input and output voltage
C Red Error LED
Check wiring: Failure in the installation, battery or battery fuse
Input voltage: Input voltage is lower than the selected Buffer
voltage+0.8V
Temp: When the temperature of the battery is lower than -10°C or
higher than 50°C or to high temperature of the DC-UPS. See Fig. 14.1
for flashing pattern of the red error LED
D Yellow Diagnosis LED
Overload: Indicates if the Output current is higher than specified
values.
Inhibit active: Indicates that buffering is disabled due to an active
inhibit signal.
Buffer-time expired: Output has switched off due to settings of
Buffer-time Limiter.
Replace battery: Indicates a battery which failed the battery quality
(SoH test). Battery should be replaced soon. See Fig. 14.2 for flashing
pattern of the yellow diagnosis LED
E Green Status LED’s
Ready: Batteries are charged > 85%, no wiring failure is recognized,
input voltage is sufficient and inhibit signal is not active.
Charging: Batteries are charging and the battery capacity is below
85%
Refreshing: Indicates an active refreshing function. (See Chapter
26.4)
Buffering: Unit is in buffer mode. See Fig. 14-3 for flashing
pattern of the green status LED’s
F Battery Size Selector
>10Ah: Charging current is set to3A
<10Ah: Charging current is set to1.5A
G Buffer-time Limiter:
User accessible dial which limits the maximum buffer time in a buffer
event to save battery energy. Recharging of Batteries is much faster if
only the necessary energy was taken out of the battery. Therefore the
following buffer-times can be selected: 10 seconds, 30 seconds, 1
minute, 3 minutes, 10 minutes or infinity (until battery is flat) which
allows buffering until the deep discharge protection stops buffering.
H Buffer-voltage Selector
The output voltage in buffer-mode can be adjusted to the four
different values 22.5V, 24V, 25V, 26V.
I Battery Port
Screw terminals, connection for battery pack
J
Optional Port
Plug connector with screw terminals, inserted from the bottom.
Connection of temperature sensors or communication interface of
intelligent battery modules and battery center tap
September 2012 / Rev. 1.3 DS-UB20.241-EN preliminary
All parameters are specified at an input voltage of 24V, 20A 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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