CPS C3T, User Manual

Page: 44 / 53

Pag. 52/53 MT-HC3TK15E1599NP-US 00
Example of parallel operation
For the sake of simplicity, the instructions shown below refer to a system with three CPSs, but are equally valid for
more complex systems.
Let us assume that the signal cable is not damaged and that the CPSs are in the following state:
CPS STATUS
1) Normal operation, Master unit
2) Normal operation, Slave unit
3) Normal operation, Slave unit
A CPS PARALLEL CABLE type RJ45
1,2,3 Parallel-connected CPSs
If the signal cable between CPSs 1 and 3 is open (CPS PARALLEL CABLE type RJ45).
CPS 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 CPS supply power to the load.
Let us assume that the signal cables between CPSs 1, 3 and 2,3 are opened.
CPS 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
N.B.: In this situation the load is only powered
correctly by CPSs 1 and 2.
To restore the broken signal cable, first the CPS
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