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QUINT-PS-100-240AC/48DC/10
Parallel operation
Devices of the same type can be connected in parallel to en-
able 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 symme-
trical 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 sup-
ply 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.
Redundant operation
I N
+ ?
I N
+ ?
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 paral-
lel are dimensioned in such a way that the total current re-
quirement of all consumers can be completely covered by
one power supply unit. 100% redundancy makes external
+ ?
Σ = I N
decoupling diodes necessary (QUINT-DIODE/40, Order No.
2938963)!
Increased performance
I N
+ ?
I N
+ ?
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
+
?
+ ?
Σ = 2 x I N
cover the current requirement of the most powerful consu-
mer. Otherwise the consumers should be spread among in-
dividual devices independent of one another. A maximum of
five devices can be connected in parallel!
102549_00_en
PHOENIX CONTACT GmbH & Co. KG ? 32823 Blomberg ? Germany
Phone: +49-(0) 5235-3-00 ? Fax: +49-(0) 5235-3-4 12 00
www.phoenixcontact.com
14
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