Date Code 20010731
Control Logic
5-23
SEL-352-1, -2 Instruction Manual
FAULT Target LED
The relay illuminates and latches the FAULT target LED when the output element for breaker
failure while tripping fault current (FBF) asserts. The target LED latches until the condition
goes away and either the Target Reset button is pushed or the
TAR R
command is issued to one
of the serial ports. Figure 5.16 shows the FAULT target LED logic.
Figure 5.16: FAULT Target LED Logic
LOAD Target LED
The relay illuminates and latches the LOAD target LED when the output element for breaker
failure while tripping load or line charging current (LBF) asserts. The target LED latches until
the condition goes away and either the Target Reset button is pushed or the
TAR R
command is
issued to one of the serial ports. Figure 5.17 shows the LOAD target LED logic.
Figure 5.17: LOAD Target LED Logic
UBAL Target LED
The relay illuminates the UBAL target LED when the output element for breaker failure due to
phase current unbalance while closing (UBBF) asserts. The target LED latches until the condi-
tion goes away and either the Target Reset button is pushed or the
TAR R
command is issued to
one of the serial ports. Figure 5.18 shows the UBAL target LED logic.
Содержание SEL-352-1
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