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UF20 Buffer Unit Instruction Manual
Technical Data
Rated input voltage
nom
Voltage range
nom
Input Current
typ.
max.
Back-up threshold
typ.
typ.
Output voltage
typ.
typ.
Output current
nom.
Hold-up time
min.
typ.
typ.
Charging time
typ.
Power dissipation
typ.
Operational temperature
nom
Storage temperature
nom.
Humidity
nom.
Vibration sinusoidal
nom.
Shock
nom.
Safety
Degree of protection
Degree of pollution
Isolation voltage
Approvals
Limited Warranty
Functional Description:
The buffer unit is a supplementary device for regulated DC24V or DC48V power supplies. It buffers load currents during typical mains faults and load peaks.
Working principle
In times when the power supply provides
sufficient 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.
Charge
Buffer
DC
Discharge
Functional Diagram:
+
+
-
-
Chassis
Ground
Back-up
Level
Selector
Terminals and Connections
open
1.
Insert the wire
UF20.241
UF20.481
DC 24V
DC 48V
24-28.8Vdc
48-56Vdc
80mA
40mA
600mA
500mA
22.5V
45V
V
–1V
V
–2V
IN
IN
22.5V
45V
V
–1V
V
–2V
IN
IN
20A
20A
200ms at 22.5V,20A 100ms at 45V,20A
200ms at 45V,10A
310ms at 22.5V,20A 150ms at 45V,20A
300ms at 45V,10A
43s at 22.5V, 0.1A
21s at 45V, 0.1A
18s
21s
1.9W
1.9W
-40 to +70°C
-40 to +85° C
5 to 95% RH
2g
30g 6ms, 20g 11ms
SELV, PELV
IP 20
2
500Vac
See datasheet or markings on the unit
3 year
Bridges mains faults without interruption
Statistics show that 80% of all mains fault
lasts less than 0.2s. In combination with
Dimension power supplies, these mains
faults are completely bridged by the buffer
unit. This increases the reliability of the
system as a whole.
AC
DC
Buffer Unit
Safety and
Reverse-
Over-
Polarity
Voltage
Protection
Protection
Input / Output
Voltage Monitor
close
2.
Snap the lever
Standby mode
Charging mode
Jumper in fixed mode
Jumper in variable mode
Jumper in fixed mode
Jumper in variable mode
in buffer mode
Standby mode
Storage, transport
No condensation allowed
IEC 60068-2-6
IEC 60068-2-27
EN/IEC 60950, EN 60204
EN/IEC 60529
EN 50178, not conductive
Terminals against housing
Extended hold-up time
Once mains power fails or is switched off, the
buffer 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
AC
DC
Buffer Unit
Buffer Capacitor
Charger &
Inrush Limiter
Buffer Capacitor
Discharger
Terminals
Type
Ferrules
Solid wire
Stranded wire
AWG
Stripping length
Pull-out force /
Tightening torque
Use appropriate copper cables that are designed for an operating temperatures of 60°C, minimum.
Follow national installation codes and regulations! Ensure that all strands of a stranded wire enter the
terminal connection!
Easy to handle, expandable and
maintanance-free
The buffer unit does not require any control
wiring. It can be added parallel to the load
circuit at any given point. Buffer units can be
switched in parallel to increase the output
.
ampacity or the hold-up time.
AC
DC
Buffer
Capacitor
Shut-Down
Buffer
Capacitor
Optokoppler
+
-
Ready Monitor
Optokoppler
+
-
Optokoppler
Active Monitor
Power Port
Bi-stable, spring clamp terminal
Allowed, but not required
2
0.5-6mm
2
0.5-4mm
AWG 20-10
10mm / 0.4inch
10AWG:80N, 12AWG:60N,
14AWG:50N, 16AWG:40N
Power
Buffer
Load
Supply
Unit(s)
+
-
Status
lamp
9 Inhibit
6 +
8 Ready
7 Active
Signal Port
Pluggable screw terminals
2
Allowed up to 1.5mm
2
0.2-2.5mm
2
0.2-2.5mm
AWG 22-14
6mm / 0.24inch
0.4Nm / 3.5lb.inch
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