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5.6 LOAD TRANSFER FROM THE INVERTER TO THE RESERVE LINE AND
RETURN OF THE LOAD TO THE INVERTER
In a system with few devices connected in parallel, the load transfer between the inverter and the
reserve line must be performed through the control panel of the unit that is in the MASTER mode.
In order to transfer the load, select the "3.3 SWITCH THE LOAD" command on the control panel
and confirm with ENTER (< >).
After 20 seconds, if the inverter is running, the load will be again automatically transferred to
the inverter. That will occur at the same time in all units in parallel.
If for any reason the inverter of one or more devices will not operate properly, the output of the
corresponding UPS.
5.7 COMPLETE SHUTDOWN OF THE PARALLEL SYSTEM
If for any reason it is necessary to disconnect and completely isolate the parallel system, follow
the next steps:
Transfer the load from the inverter to the reserve line on the control panel of the UPS in the
„
MASTER mode.
Switch off the inverter of the MASTER UPS through the control panel.
„
Repeat the operation above for all the other units of the parallel system.
„
Open the UPS output DJS.
Figure 5.20: Switch-disconnectors position when the main line and backup line switch-disconnectors closed
Repeat the operation above for all the other units of the parallel system.
Open the reserve input DJER.
Figure 5.21: Position of switch-disconnectors when the mains line switch-disconnector closed
Repeat the operation above for all the other units of the system.
Mains line
Reserve
ON
ON
Mains line
Reserve
ON
OFF
UPS Enterprise Parallelism Procedure
M-Bypass
Output
OFF
OFF
M-Bypass
Output
OFF
OFF
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