CP10.241, CP10.241-C1, CP10.241-S1,
CP10.241-S2, CP10.242
CP-Series
24V,
10A,
240W,
S
INGLE
P
HASE
I
NPUT
Aug. 2017 / Rev. 1.4a DS-CP10.241-EN
All values are typical at 24V, 10A, 230Vac, 50Hz, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
24.7.
P
ARALLEL
U
SE FOR
R
EDUNDANCY
1+1 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
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. It is essential to 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.
Optionally to the use of external redundancy modules, power supplies with built-in redundancy CP10.241-R1 (spring-
clamp terminals), the CP10.241-R2 (plug connectors for hot swap) or the CP10.241-R3 (screw terminals) can be used.
Recommendations for building redundant power systems:
- Use separate input fuses for each
power supply.
- Monitor the individual power supply units. Therefore, use the DC-OK relay contact of the power supply.
- It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
Wiring examples for 1+1 redundancy:
Fig. 24-5
Wiring for 1+1 redundancy with the redundancy module
YR20.242
Fig. 24-6
Wiring for 1+1 redundancy with the redundancy module
YR20.246
L
N
PE
Max.
10A
Load
Failure
Monitor
I
YR20.242
Redundancy
Module
Output
Input
1
Input
2
+
+
-
-
+
-
opt
iona
l
Power
Supply
24V,10A
DC-
OK
+ +
- -
L N PE
Output
Input
o
o
Power
Supply
24V,10A
DC-
OK
+ +
- -
L N PE
Output
Input
o
o
I
Max.
10A
Load
Load
Share
Warning
I
opt
iona
l
Power
Supply
24V, 10A
+ +
- -
L N PE
Output
Input
DC-
OK
o
o
I
YR20.246
Redundancy
Module
Output
1
Input
2
Input
+
+
-
-
+
-
Load Share
OK
o
o
Redudnadcy
OK
o
o
Failure
Monitor
Power
Supply
24V, 10A
+ +
- -
L N PE
Output
Input
DC-
OK
o
o
+
-
PE
N+1 Redundancy:
Redundant systems for a higher power demand are usually built in a N+1 method. E.g. four power supplies, each rated
for 10A are paralleled to build a 30A redundant system.
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
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 or in
any other condition, where a derating of the output current is required.
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