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healthy state, the echo signal is restricted to last for 200 ms by delayed pickup timer T2.
Figure 2.12-7 and Figure 2.12-8 shows ECHO logic. Users can enable ECHO operation
using scheme switch [Dis-ECHO] by setting it to Off.
Figure 2.12-7 ZCS and ZCG for ECHO/WKIT operation
Permission signals received:
810000EBBE DIS-ECHO BLOCK
Figure 2.12-8 ECHO logic
(ii) WIKT function
Figure 2.12-9 shows WIKT logic. WIKT can issue a trip signal on condition that a trip
permission signal has been received when POP operates. On the other hand, when UOP
operates, WIKT can issue a trip signal when a trip block signal has been stopped.
To operate WIKT, the following conditions are required:
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