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9.3 Operation 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.
9.3.1 Start-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.
i
The load supply now takes place via the central
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!