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QUINT-PS/ 3AC/24DC/20
15
Function
Output characteristic curve
The power supply unit works with the static power reserve
U N
I < I N
I > I N
POWER BOOST as shown in the U/I characteristic curve in
the figure. At ambient temperatures T amb < +40 °C, I BOOST is
available continuously. At higher temperatures, it's available
U < 0,9 x U N
for a few minutes. In the event of a secondary-side short
circuit or overload, the output current is limited to I BOOST .
Thereby, the module does not switch off, but rather supplies
a continuous output current. The secondary voltage is
I BOOST
I N
I N
I BOOST
I OUT [A]
reduced here until the short circuit is eliminated. The U/I
characteristic curve with the power reserve POWER BOOST
ensures that both high inrush currents of capacitive loads as
well as consumers with DC/DC converters in the primary
circuit can be supplied.
In order to trip standard power circuit breakers magnetically
and very quickly, power supply units must supply a multiple of
their nominal current for a short period.
As can be seen from the characteristic curve, when I < I N , I >
I N and U < 0.9 x U N . The relevant signaling can be found in the
table "Signaling".
U N = 24 V
I N = 20 A
I BOOST = 26 A
SFB technology = 120 A
P N = 480 W
P BOOST = 625 W
Thermal behavior
With an ambient temperature of up to +40°C, the device
supplies the continuous output current of I BOOST . The device
can supply a nominal output current of I N with ambient
temperatures of up to +60°C. In the case of ambient
temperatures above +60°C, the output current must be
reduced by 2.5% per Kelvin increase in temperature. The
device does not switch off at ambient temperatures of +70°C
0
-25
303132_en_01
2 0
40 6 0
Ambient temperature [°C]
or thermal overload. The output capacity is reduced as far as
necessary to provide device protection. After it has cooled
down, the output capacity is increased again.
14
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