Parallel use for redundancy
1+1 Redundancy
Devices of the same Type PS9731-2410-0000 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.
- 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 example
