Datasheet

STEP-PS/1AC/24DC/0.75/FL
103898_en_00 PHOENIX CONTACT 12
-25
0
I
N
20 40 60
Ambient temperature [°C]
Output current [A]
Thermal behavior
With an ambient temperature of up to +55°C, the device
supplies the continuous output current of I
N
. In the case of
ambient temperatures above +55°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
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.
Parallel operation
Devices of the same type can be connected in parallel to
enable both redundancy and an increase in efficiency. No
other alignment is necessary when in the state of delivery.
To ensure symmetrical distribution of power, we recommend
designing all cable connections from the power supply unit to
a busbar of the same length and with the same conductor
cross section. The system makes it advisable to install a
protective circuit at the output of each device when more than
two power supply units are connected in parallel (e.g.
decoupling diode or DC fuse). This prevents high reverse
feed currents in the event of a secondary device fault.
+
I
N
−
+
I
N
−
+
+
−
−
Σ =I
N
Redundant operation
Redundant circuits are suitable for the supply of systems
which make especially high requirements on the operational
safety. If a fault occurs in the primary circuit of the first power
supply unit, the second device automatically takes over the
entire power supply, without interruption, and vice versa. For
this reason, the power supply units to be connected in parallel
are dimensioned in such a way that the total current
requirement of all consumers can be completely covered by
one power supply unit. 100% redundancy makes external
decoupling diodes necessary (QUINT-DIODE/40, Order No.
2938963)!