Datasheet

UF20.481
UF-Series
48V, 20A, 100MS, BUFFER MODULE
3. FUNCTIONAL DESCRIPTION
Working principle
When the power supply provides sufficient voltage, the buffer module stores energy in
the integrated electrolytic capacitors. In case of a voltage dip or loss, this energy is
released to the DC bus in a regulated process.
DC
Charge
Discharge
Storage
AC
DC
Buffer Module
Bridges mains faults without interruption
Statistic show that 80% of all mains fault lasts less than 0.2s. These mains faults are
completely bridged by the buffer unit up to 10A load current. For higher load currents
use multiple buffer modules in parallel. This increases the reliability of the system as a
whole.
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 Module
Easy to handle, expandable and maintenance-free
The buffer module does not require any control wiring. It can be added parallel to the
load circuit at any given point. Buffer modules can be connected in parallel to increase
the output ampacity or the hold-up time.
DC
Buffer
Module
Power
Supply
Load
AC
+
-
Fig. 3-1 Typical wiring diagram Fig. 3-2 Transfer behavior
Power
Supply
Output
4/18
PE
L
+ -
N
Power
Supply
+ -
Load
+ -
Buffer
Module
optional
Buffer
Mode
Supply
Voltage
t
t
Transfer Threshold
Power
Supply
Mode
Power
Supply
Mode
Oct. 2016 / Rev. 2.0 DS-UF20.481-EN
All parameters are specified at 48V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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