AEG 61000M Operations Instructions download pdf (Page 33)

7 Adding/Removing Modules

7.1 Active 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.

7.2 Installing 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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AEG 61000M Operations Instructions Page 33