11.When the displays are lit as described, switch on your loads one after the other. When doing this, take care not to exceed the maximum permitted load capacity of the UPS systems. Also take into account the reserve capacities if active redundancy should be required.

9.3.2Changes to the parallel system

If you would like to add a UPS to the parallel system or remove a UPS from the parallel system, this step is always done by returning the UPS systems to BYPASS operating mode.

i

Load supply through mains operation!

(No UPS protection during this measure).

 

First, switch off the inverters of the UPS systems one after the other (actuate the “OFF” pushbuttons). All UPS systems function in SBS/bypass operation. Check the operating state on the operating panels. Next, active the integrated manual bypasses (no. 3, p. 26/27) on the back of each UPS. To do this, first remove the 4 screws of the covers on the back.

Put the mains input miniature circuit breakers of each UPS (no. 2, p. 26/27) to “OFF” position. Use your central external manual bypass to bypass the loads, i.e. activate the bypass operation and remove the load supply from the UPS busbar.

The voltage of each UPS is disconnected in its low-voltage main distribution. You can now expand or reduce your parallel system. Pay attention to the jumpers “JP1” / “JP2” and the parallel operation cables. The subsequent start-up is carried out as described in chapter 9.3.1.

i

If you only want to switch off a UPS in the

parallel system, press the “OFF” pushbutton

 

 

twice in succession to do this. In this way,

 

individual UPS systems can be disconnected

 

from the parallel operation busbar.

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