Datasheet

TRIO-PS/3AC/24DC/5
103346_en_00 PHOENIX CONTACT 12
15 Function
I [A]
OUT
U [V]
OUT
U
N
I
N
Output characteristic curve
The device functions following the U/I characteristic curve.
Under load, the working point follows this curve. The output
current is limited in the event of a short circuit or overload.
Thereby, the device does not switch off, but rather supplies a
continuous output current.
The secondary voltage is reduced until the short circuit or
overload on the secondary side has been remedied. The U/I
characteristic curve ensures that both heavily capacitive
loads and loads with DC/DC converters in the primary circuit
can be supplied. Downstream fuses are triggered. Selectivity
in the design of your system is guaranteed at all times.
U
N
= 24 V
I
N
= 5 A
P
N
= 120 W
0
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.
If the output voltage is adjusted, a uniform distribution of
power is guaranteed by setting all parallel operated power
supply units to exactly the same output voltage.
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.