IV404E Rev.000 SIEL S.p.A.
Issue date: 2017-06-05 Pag. 73 di 90 + FR
Example of parallel operation
For the sake of simplicity, the instructions shown below refer to a system with three UPSs, but are
equally valid for more complex systems.
Let us assume that the signal cable is not damaged and that the UPSs are in the following state:
UPS STATUS
1) Normal operation, Master unit
2) Normal operation, Slave unit
3) Normal operation, Slave unit
A UPS PARALLEL CABLE type RJ45
1,2,3 Parallel-connected UPSs
If the signal cable between UPSs 1 and 3 is open (UPS PARALLEL CABLE type RJ45).
UPS STATUS
1) Normal operation, Master unit with
message “Parallel signal cable fault” appears
on the panel
2) Normal operation, Slave units with message
“Parallel signal cable fault” on the panel
3) Normal operation, Slave units with message
“Parallel signal cable fault” on the panel
N.B.: in this situation the load is powered correctly. All the SAFEPOWER EVO HFT supply power to the
load.
1
2
3
A
A
1
2
3
A
A
