UNO-PS/1AC/24DC/30W
105516_en_00 PHOENIX CONTACT 13
9 Operating behavior of the power
supply unit
9.1 Normal operation
In normal operation, the loads are supplied with a constant
output voltage of 24 V DC.
9.2 Overload response
In the event of overload (I > I
N
), the device reduces its output
voltage. If the output voltage is greater than U
N
x 0.9, the
green DC OK LED lights up. If the output voltage drops
below U
N
x 0.5, the device shuts down. After a short time,
the device attempts to start up again. If the overload has
been rectified, it will start up as normal. If the overload has
still not been rectified, it will shut down again and attempt to
restart again (automatic restart).
Figure 9 Output characteristic curve
9.3 Behavior at ambient temperatures > 55°C
At an ambient temperature of up to 55°C, the power supply
unit supplies the nominal output current. At ambient temper-
atures upwards of 55°C, the output power must be reduced
by 2.5% per Kelvin temperature increase (temperature-de-
pendent derating).
Figure 10 Temperature-dependent derating
[A]
[V]
UN
UN x 0,5
IN
-25
0
I
N
20 40 60
[A]
[°C]
