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SYS POWER SUPPLY UM E
3.15.3
U/I Characteristic With Power Boost
Power supply units with U/I characteristic and power boost are electronically protected
against overload and short circuit. At nominal voltage the maximum output current of these
devices is up to two times the nominal current, depending on the type and ambient
temperature.
Overloading individual power supply units is thus permitted up to 100%. In the event of
heavier loads the working point uses the U/I curve shown in Figure 3-28. In the event of a
short circuit the output current of up to two times the nominal current is still available while
the output voltage is reduced.
The power reserve ensures that highly capacitive loads and loads with DC/DC converters
in the input circuit are supplied at any time without problems.
In the event of a load short circuit, the high short circuit current ensures reliable fuse
blowing in the secondary circuit in order to keep the selectivity.
These properties make power supply units with U/I characteristic and power boost
optimally suitable for use in universal industrial applications.
U out [V]
24
I N
I Boost
I out [A]
5598D307
Figure 3-28
U/I characteristic with power boost
QUINT POWER, MINI POWER and STEP POWER power supply units from
Phoenix Contact operate according to the U/I characteristic and are provided with the
power boost power reserve.
3-42
PHOENIX CONTACT
5598_en_03
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