ABB RELION 620 Series Technical Manual page 990

Section 9
Control functions
984
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Figure 506: Condition for enabling the close request (CL_REQ) for CBXCBR
When the open command is given from communication, via LHMI or activating the
AU_OPEN input, it is processed only if OPEN_ENAD is TRUE. OP_REQ output is also
available.
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Figure 507: Condition for enabling the open request (OP_REQ) for CBXCBR
OPEN and CLOSE outputs
The EXE_OP output is activated when the open command is given (AU_OPEN, via
communication or from LHMI) and OPEN_ENAD signal is TRUE. In addition, the
protection trip commands can be routed through the CBXCBR function by using the
TRIP input. When the TRIP input is TRUE, the EXE_OP output is activated
immediately and bypassing all enabling or blocking conditions.
The EXE_CL output is activated when the close command is given (AU_CLOSE, via
communication or from LHMI) and CLOSE_ENAD signal is TRUE. When the TRIP
input is "TRUE", CB closing is not allowed.
1MRS757644 F
620 series
Technical Manual