MINI-PS- 12- 24DC/48DC/0.7
104349_en_00 PHOENIX CONTACT 10
DC OK
DC OK
+- -
Active signal output
The DC output signal in normal operation of the power supply
unit (U
OUT
> 0.9 x U
N
) is between the "DC OK" and "-"
connection terminal blocks and can carry a maximum of
20mA. By switching from "active high" to "low", the DC OK
signal output signalizes when the output voltage is fallen short
of by more than 10%.
The DC OK signal is decoupled from the power output. It is
thus not possible for devices connected in parallel to act as an
external power supply.
13 Function
-25
0
I
N
20 40 60
Ambient temperature [°C]
Output current [A]
Thermal behavior
The device can supply a nominal output current of 0.7 A with
ambient temperatures of up to 60°C. For ambient
temperatures above 60°C, the output current must be
reduced by 2.5% per Kelvin increase in temperature. From
70°C onwards or in the case of thermal overload, the device
reduces the output capacity for its own protection, and returns
to normal operation when it has cooled down.
Parallel operation
Devices of the same type can be connected in parallel to
increase both redundancy and power. By default upon
delivery, no further adjustments are required.
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 current distribution we recommend
that all cable connections from the power supply unit to the
busbar are the same length and have the same cross section.
Depending on the system, for parallel connection of more
than two power supplies a protective circuit should be
installed at each individual device output (e.g., decoupling
diode, DC fuse or circuit breaker). This prevents high return
currents in the event of a secondary device fault.
