CP10.121 Datasheet, PDF (23/26 Pages) PULS GmbH – SINGLE PHASE INPUT

CP-Series
CP10.121
12V, 16A, SINGLE PHASE INPUT
24.5. PARALLEL USE TO INCREASE OUTPUT POWER
CP10.121 power supplies can be paralleled to increase the output power. The
output voltage of all power supplies shall be adjusted to the same value
(±100mV) with the same load conditions on all units, or the units can be left
with the factory settings. There is no feature included which balances the load
current between the power supplies. Usually the power supply with the higher
adjusted output voltage draws current until it goes into current limitation. This
means no harm to this power supply as long as the ambient temperature stays
below 40°C.
Unit A
AC
+
-
DC
Unit B
AC
+
+
Load
-
If more than three units are connected in parallel, a fuse or circuit breaker
with a rating of 25A or 32A is required on each output. Alternatively, a diode
or redundancy module can also be utilized.
-
DC
Energize all units at the same time to avoid the overload Hiccup^PLUS mode. It also might be necessary to cycle the input
power (turn-off for at least five seconds), if the output was in Hiccup^PLUS mode due to overload or short circuits and the
required output current is higher than the current of one unit.
Restrictions:
Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other.
Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation
(terminals on bottom of the unit) or in any other condition where a derating of the output current is required (e.g.
altitude, …).
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
24.6. PARALLEL USE FOR REDUNDANCY
Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a
certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
decoupled power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other
one is automatically able to support the load current without any interruption. Redundant systems for a higher power
demand are usually built in a N+1 method. E.g. five power supplies, each rated for 16A are paralleled to build a 64A
redundant system. For N+1 redundancy the same restrictions apply as for increasing the output power, see also
chapter 24.5.
Please note: Always use a redundancy module to decouple
power supplies from each other. This prevents that the
defective unit becomes a load for the other power supplies and
the output voltage cannot be maintained any more. Further
information and wiring configurations can be found in chapter
23.2.
Recommendations for building redundant power systems:
a) Use separate input fuses for each power supply.
b) Monitor the individual power supply units. Therefore, use
the DC-OK relay contact of the CP10 power supply.
c) It is desirable to set the output voltages of all units to the
same value (± 100mV) or leave it at the factory setting.
++- - -
12-15V
DC-OK
DC-
OK
CP10.121
Power Supply
L N PE
I
L
N
PE
+-+-
Input Input
12
YR40.242
Redundancy
Module
Output
+-
++- - -
12-15V
DC-OK
DC-
OK
CP10.121
Power Supply
L N PE
Failure
Monitor
I
12V,16A
Load
Feb. 2016 / Rev. 1.1 DS-CP10.121-EN
All parameters are specified at 12V, 16A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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