Datasheet

CD10.482
CD-Series
DC/DC Converter 48V/48V, 5A, 240W
PRELIMINARY
22.6. PARALLEL USE FOR REDUNDANCY
1+1 Redundancy:
Devices 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 device fails. The simplest way is to put two devices in parallel.
This is called a 1+1 redundancy. In case one device 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 devices from each other. This
prevents that the defective unit becomes a load for the other device and the output voltage cannot be maintained any
more.
1+1 redundancy allows ambient temperatures up to +70°C.
Pay attention that EMI and inrush current will increase when using multiple devices.
Recommendations for building redundant power systems:
- Use separate input fuses for each device.
- Use separate supply systems for each device whenever it is possible.
- Monitor the outputs of the individual devices. Use the DC-ok lamp or the DC-ok contact, which are included in the
redundancy module YRM2.DIODE.
- It is desirable to set the output voltages of all devices to the same value (± 100mV) or leave it at the factory setting.
N+1 Redundancy:
Redundant systems for a higher power demand are usually built in a N+1 method. E.g. four devices, each rated for 10A
are paralleled to build a 30A redundant system.
Pay attention that EMI and inrush current will increase when using multiple devices.
Keep an installation clearance of 15mm (left / right) between two devices and avoid installing the devices on top of
each other.
Do not use devices in parallel in mounting orientations other than the standard mounting orientation or in any other
condition, where a reduction of the output current is required.
For N+1 redundancy the ambient temperature is not allowed to exceed +45°C.
Wiring examples for 1+1 and n+1 redundancy:
Fig. 22-4 1+1 Redundant configuration for 5A
load current with a dual redundancy module
Fig. 22-5 N+1 Redundant configuration for 15A load current
with multiple DC/DC converters and redundancy modules
Load
Failure
Monitor
YRM2.DIODE
Redundancy
Module
Output
Input
1
Input
2
+
-
+
-
+
-
o o o o
2
1
Input ok
DC/DC
Converter
++
--
+
-
Output
Input
I I
optional
DC/DC
Converter
++
--
+
-
Output
Input
Functional Earth
+
-
Load
I I
optional
YRM2.DIODE
Redundancy
Module
Output
Input
1
Input
2
+
-
+
-
+
-
o o o o
2
1
Input ok
YRM2.DIODE
Redundancy
Module
Output
Input
1
Input
2
+
-
+
-
+
-
o o o o
2
1
Input ok
Failure
Monitor
I I
optional
DC/DC
Converter
++
--
+
-
Output
Input
DC/DC
Converter
++
--
+
-
Output
Input
DC/DC
Converter
++
--
+
-
Output
Input
DC/DC
Converter
++
--
+
-
Output
Input
+
-
Functional Earth
July 2018 / Rev. 0.1 DS-CD10.482-EN All values are typical figures specified at 48Vdc input voltage 48V, 5A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
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