Siemens siprotec SJ62 User Manual page 198

Figure 2-66 Message logic for the trip circuit monitor
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
The trip circuit monitor does not operate during system faults. A momentary closed
tripping contact does not lead to a failure message. If, however, tripping contacts from
other devices operate in parallel in the trip circuit, then the fault annunciation must be
delayed (see also Figure 2-65). The state of the binary input is therefore, checked 500
times before an annunciation is sent. The state check takes place about every 600 ms,
so that trip monitoring alarm is only issued in the event of an actual failure in the trip
circuit (after 300 s). After the malfunction in the trip circuit is cleared, the fault annun-
ciation is reset automatically after the same period.
Figure 2-65 Logic diagram for trip circuit monitoring with one binary input
The following figure shows the logic diagram for the message that can be generated
by the trip circuit monitor, depending on the control settings and binary inputs.
2.11 Monitoring Functions
196