Parallel use for redundancy
1+1 Redundancy
Devices of the same type PS9711-2410-0000 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 individual devices. Therefore, use the DC OK relay contact.
- It is desirable to set the output voltages of all devices to the same value (± 100 mV) or leave it at the factory setting.
N+1 Redundancy
 | Notes on parallel use for N + +1 redundancy
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Redundant systems for a higher power demand are usually built in a N+1 method. E.g. four devices, each rated for 10 A, are paralleled to build a 30 A redundant system.
- Maintain an installation distance of 15 mm (left/right) between two devices.
- Do not install the devices on top of each other.
- Do not use parallel-connected devices in installation positions that deviate from the standard installation position or in any other state that requires the output current to be reduced.
Wiring example:
