UN_U_BUS2
UN_U_BUS1
BLOCK
BUS1_FAULT
BUS1_HEALTHY
BUS2_FAULT
BUS2_HEALTHY
OR
NOT
OR
NOT
Figure 349: Sub module diagram for Bus fault check
Control logic
Depending on the Main bus priority setting, the control logic reads the states of
the circuit breakers and performs automatic transfers depending on bus voltage
presence and blocking conditions. In control logic sub module diagrams, all the
open/close situations in automatic mode are illustrated.
CB1 control logic
Figure 350: Sub module diagram for CB1 control logic
Operation of the output signals is described in the table.
Table 693: Operating conditions for output signals of CB1
Output signal
Operation description
Operation type
OPEN_CB1
If bus 1 is faulty and
the CB1 position is closed,
Protection
Table continues on the next page
Control functions
1MRS758755 C
692
REC615 & RER615
Technical Manual
