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Power Supply PS1000-D2-24.10
Application Notes
23.6
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 Redundancy-OK contact, which is included in the YR20.246 redundancy module.
•
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.
Restrictions
•
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:
Figure 23.6
36
-
-
- -
+ +
+
+
o o o o
Input
Input
Output
1
1
2
Input ok
YRM2.DIODE
DC/DC
Converter
Redundancy
Module
Input
Output
-
-
+
+
I
+
-
F unc tional E arth
1+1 Redundant configuration for 10A load current
-
-
- -
+ +
+
+
o o o o
Input
Input
Output
2
1
2
1
2
Input ok
YRM2.DIODE
DC/DC
Converter
Redundancy
Module
Input
Output
-
-
+
+
I
Failure
Monitor
Load
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