9.3Operation of the UPS in a parallel system

The start-up process is uncomplicated, does not require any prior knowledge and is basically oriented to the procedure described in chapter 6. If you have obtained the parallel operation board from AEG Power Supply Systems, you can find further special instructions there. The displays in the parallel system function the same way as described for the individual UPS units in chapter 8.

9.3.1Start-Up

13.Make sure that all connections have been made according to the installation instructions.

14.Make sure that all loads are switched off.

15.Make sure that all “maintenance switch” manual bypass switches (no. 3, p. 27/28) on the back of each UPS are in the “Bypass” position and all mains input miniature circuit breakers (no. 2, p. 27/28) on the back of each UPS are in the “OFF” position.

16.Check the position of the central external manual bypass. This must be in the “Bypass” position, i.e. supply of the load busbar by the supplying mains.

17.Now close all isolators in the output of each UPS, i.e. connect the output of each UPS with the parallel operation busbar.

18.Now insert the back-up fuses in your low-voltage main distribution (where the central external manual bypass as well as the individual UPS systems are connected to the mains on the input side) or switch on the corresponding line protection switches there.

The load supply now takes place via the central i external manual bypass, and the parallel operation busbar is supplied with power via the integrated manual bypasses of each UPS. However, the parallel operation busbar and load busbar are not yet connected to each other at

this time!

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