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0MLMHTK65RUENUB
Example of parallel operation
For the sake of simplicity, the instructions shown below refer to a system with three UPS’s, but are equally
valid for more complex systems.
Let us assume that the signal cable is not damaged and that the UPS’s 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 UPS’s
If the signal cable between UPS’s 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
Note: In this situation, the load is powered correctly. All the UPS’s supply power to the load.
Let us assume that the signal cables between UPS’s 1,3 and 2,3 are opened.
UPS STATUS
1) Normal operation, Master unit with
message “Parallel signal cable fault” on the
panel
2) Normal operation, Slave units with
message “Parallel signal cable fault” on the
panel
3) Disconnected (TLI open, SCRs off),
Slave units with message “INTERNAL
FAULT 10” on the panel
NOTE: In this situation the load is only
powered correctly by UPS’s 1 and 2.
To restore the broken signal cable, first the UPS with the message “INTERNAL FAULT 10” on the panel has to be
shut down.
1
2
3
A
A
1
2
3
A
A
1
2
3
A
A