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0MLMHTK65RUENUB
1.1.16
SWOUT and SWMB aux.
The auxiliary contacts of the external SWMB and of the SWOUT shall be connected to the board of each UPS in
parallel, as depicted in the diagram below.
Note: MASTER HP-UL series have input terminals (for acquiring the status of aux contacts) isolated from the
internal circuits of the UPS. This will result in to be sufficient a single aux contact electrical connection of the
External switch brought to each UPS of the parallel system.
The auxiliary contacts of SWOUT EXT and SWMB EXT must be connected to terminal J1on aux signals isolation
board. The purpose of this board is to isolate the internal circuits of UPS, so that, in case of parallel of UPS, one
auxiliary contact of an external switch is sufficient to be acquired by all the UPS in parallel.
For safe removal, the UPS must placed onto bypass, closing SWMB EXT, opening SWIN EXT and SWOUT EXT
and disconnecting the UPS.
Aux Contact SWOUT EXT must be N.O. (same position of the power contacts) while aux contacts SWMB EXT
must be N.C., (opposite position of power contacts).
Note:
-
the auxiliary switch of SWMB EXT must open in advance, before closing the power contact
-
the auxiliary switch of SWOUT EXT must close in advance, before opening the power contact
