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The active redundant parallel operation automatically goes into performance-
enhancing operation, if the output power requirements exceed the UPS single-
block performance. Conversely, the active degree of redundancy will be activated
automatically when the power consumption is lower than the UPS single-block
capacity of two parallel-connected devices. As a rule they can be interconnected
on the low-voltage main distribution boards (LV), which include the external
manual bypass and the subsequent sub-distribution of connected load circuits.
Optionally, such a supply and paralleling field is available in the rack-mount (3U)
version including external manual bypass, from AEG Power Solutions through your
dealer (article-no. 6000012436).
10.2 INSTALLATION / CONNECTION OF PARALLEL FIELD
OPERATION
The power supply of each UPS is analogous to the description in chapter 6.
With regard to the bypass feed, the power supply secured per UPS has to
be made simultaneous, i.e. both UPSs are connected to the bypass input
terminals - (No mix!) and fed by the respective same phase.
The UPS outlets are each connected through a disconnector to the parallel
operation. Here again, the instructions are in chapter 6.
Generally applicable for UPS entry and exit wires: with wire lengths up to
10 meters per UPS the wire length differences may be max. 20%, and for
lengths >10 m max. per UPS it may be 5%.
The UPS outlet distribution must also be in accordance with the procedures
contained in chapter 6. Pay particular attention to the correct identification
of the individual switching elements, to prevent incorrect use later on. The
communication between the paralleled units occurs via an optional 15-pin
parallel operational line.