UF20.4810 pages

UF20.481
48V, 20A, 100ms

– U-Series

BUFFER UNIT
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Buffering with electrolytic capacitors instead
of lead batteries
Buffering of 48V loads
Minimum hold-up time 0.1s at 20A and 0.2s at 10A
Longer hold-up time at lower loads
Clear status indication by status LED and signaling
terminals
Quick-connect spring-clamp terminals
3 Year warranty

1. GENERAL DESCRIPTION

2. SHORT-FORM DATA

The buffer unit is a supplementary device for regulated
DC48V power supplies. It buffers load currents during
typical mains faults and load peaks.

Rated voltage
Voltage range
Output voltage

Working principle

Charge

Buffer

In times when the power DC
supply provides sufficient
Discharge
voltages, the buffer unit
stores energy in integrated electrolytic capacitors. In case of
mains voltage fault, this energy is released again in a
regulated process.
Bridges mains faults
without interruption

AC

Statistic show that 80% of
DC
all mains fault lasts less
Buffer Unit
than 0.2s. These mains
faults are completely bridged by the buffer unit. This
increases the reliability of the system as a whole.
Extended hold-up time

Buffer mode
select with jumper

min 0.1s

45V, 20A

typ 0.15s

45V, 20A

min 13.4s

45V, 0.1A
45V, 0.1A

typ 21s

Charging current
Charging time
Input current
Power dissipation
Temperature range
Dimensions

max 500mA
typ. 21s

typ 40mA
typ 1.9W
-25°C to +70°C
64x124x102mm

standby mode
standby mode
operational
WxHxD

AC

Once mains power fails or
DC
is switched off, the buffer
Buffer Unit
unit will continue to
provide the load current for a defined period of time.
Process data can be saved and processes can be terminated
before the DC power switches off. Controlled restarts are
subsequently possible.

3. ORDER NUMBERS
Buffer Unit
Accessory

Output current
Hold-up time

DC 48V
48-56V
45V or
VIN –2V
0 to 20A

UF20.481
ZM1.WALL
ZM14.SIDE
XF-1x4s/270-60

Easy to handle, expandable and maintanance-free
The buffer unit does not require
Power
Buffer
any control wiring. It can be
AC
Supply
Unit(s)
added parallel to the load circuit
at any given point. Buffer units
DC
can be switched in parallel to
increase the output ampacity or the hold-up time.

Load

+
-

4. MARKINGS
48V, 20A, 100ms
Wall mounting
bracket
Side mounting
bracket
Mating connector,
Part of derlivery

UL 60950-1

UL 508

May 2013 / Rev. 1.2 / DS-UF20.481-EN
All parameters are specified at 48V, 10A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0

Germany

EMC, LVD

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