CPS20.241-60
C-Series
24V,
400W,
DC/DC
C
ONVERTER
Sep. 2019 / Rev. 1.1 DS-CPS20.241-60-EN
All parameters are specified at 24.5V, 16.3A, 110Vdc, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
20/22
23.6.
P
ARALLEL
U
SE TO
I
NCREASE
O
UTPUT
P
OWER
CPS20.241-60 DC/DC converters can be paralleled to increase the output power as long as the ambient temperature
stays below 60°C.
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.
Fig. 23-4
Parallel use to increase the output power
Instructions for parallel use:
Unit A
Unit B
-
+
-
+
Load
+
-
Input
Output
Input
Output
- Keep an installation clearance of 15mm (left / right)
between two DC/DC converters and avoid installing the
DC/DC converters on top of each other.
- Do not parallel DC/DC converters in 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,
temperature, input voltages).
- Pay attention that EMI and inrush current will increase
when using multiple DC/DC converters.
23.7.
P
ARALLEL
U
SE FOR
R
EDUNDANCY
CPS20.241-60 DC/DC converters 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 DC/DC converter unit fails. The simplest way is
to put two DC/DC converters in parallel. This is called a 1+1 redundancy. In case one DC/DC converter 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 DC/DC converter, 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
section 23.6.
Since the CPS20.241-60 already has decoupling MOSFETS included, which cover failures such as an internal short circuit
in the secondary side of the DC/DC converter, no additional redundancy modules are required.
Fig. 23-5
Redundant power design
24V
20A
Load
+
-
PE
Failure
Monitor
PE
CPS20.241-60
24.5V 400W
Power
Supply
+ +
- -
DC-
OK
Input
Output
+
-
I
I
PE
CPS20.241-60
24.5V 400W
Power
Supply
+ +
- -
DC-
OK
Input
Output
+
-
Recommendations for building redundant power
systems:
- Use separate input fuses for each
DC/DC
converter.
- Monitor the individual DC/DC converter units.
Use the DC-OK relay contact of the CPS20.241-60.
