Datasheet

QUINT-PS/3AC/24DC/20
103132_en_00 14
PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany
Phone: [phone] • Fax: [phone]
www.phoenixcontact.com
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.
+
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)!
+
I
N
−
+
I
N
−
+
+
−
−
Σ =2xI
N
Increased performance
For n parallel connected devices, the output current can be
increased to n x I
N
. Parallel connection to increase efficiency
is used for the expansion of existing systems. It is advisable
to use parallel connection if the power supply unit does not
cover the current requirement of the most powerful
consumer. Otherwise the consumers should be spread
among individual devices independent of one another. A
maximum of five devices can be connected in parallel!