7 Adding/Removing Modules

7.1Active Redundancy

n+x technology is one of the most reliable configurations. "n" represents the minimum number of PROTECT 1.040 UPS modules that requires the total power; "x" represents the number of redundant PROTECT 1.040 UPS modules, i.e. the number of fault-tolerant modules that the system can handle at the same time. Assume the apparent output power to be achieved is 15 kVA, for example. One module of the PROTECT 1.M delivers 4 kVA. This means it is necessary to select n=4 at least (4 x 4 kVA = 16 kVA). If x = 2 then two additional UPS modules would provide active redundancy.

In the sample configuration above, each of the 6 UPS modules delivers a 2.5 kVA proportion of the overall power. If one module were to fail, the five other modules would each deliver 3 kVA. If two UPS modules fail, the remaining four modules would each deliver 3.75 kVA. The system indicated here therefore permits a maximum of two modules to fail, although the probability of two modules failing simultaneously is considerably lower than that of one module failing. Furthermore, additional modules guarantee that the overall system has a higher overload capacity, for instance.

You can increase capacity by adding to the number of modules in the PROTECT 1.M. Do this by connecting from one to six modules in parallel. The six UPS modules function autonomously and are independent of one another. Faulty modules can easily be renewed during ongoing operation at any time.

7.2Installing and Removing UPS Modules

The PROTECT 1.M uses what is referred to as hot-swappable technology, which means you can install or uninstall, add or remove modules irrespective of whether the unit is switched on or off. If the UPS is operating with loads, before removing any modules you should check that the remaining modules are capable of providing sufficient power otherwise there may be an overload.

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