Date Code 20010731
Control Logic
5-21
SEL-352-1, -2 Instruction Manual
TRIP Target LED
The relay illuminates and latches the TRIP target LED whenever one of the trip elements
(TRIP3, TRIPA, TRIPB, TRIPC) asserts and a close condition does not exist. The TRIP target
LED latches until a close condition occurs, the Target Reset button is pushed, or the
TAR R
command is issued to one of the serial ports. Figure 5.12 shows the TRIP target LED logic.
Figure 5.12: TRIP Target LED Logic
If both a trip and close condition exist at the same time, the CLOSE target LED illuminates and
the TRIP target LED extinguishes because of the processing order. For simplicity, this is not
represented in the logic diagram.
CLOSE Target LED
The relay illuminates and latches the CLOSE target LED whenever one of the close elements
(CLOSE, MCLOSE) assert. The CLOSE target LED latches until the close conditions deassert,
a trip condition asserts, the Target Reset button is pushed, or the
TAR R
command is issued to
one of the serial ports. Figure 5.13 shows the CLOSE target LED logic.
Figure 5.13: CLOSE Target LED Logic
If both a trip and close condition exist at the same time, the CLOSE target LED illuminates and
the TRIP target LED extinguishes because of the processing order. For simplicity, this is not
represented in the logic diagram.
Содержание SEL-352-1
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