
Functions
2.8 Monitoring Functions
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
140
2.8.2
Trip Circuit Supervision 74TC
Devices 7SJ61 are equipped with an integrated trip circuit supervision. Depending on the number of available
binary inputs (not connected to a common potential), supervision with one or two binary inputs can be selected.
If the allocation of the required binary inputs does not match the selected supervision type, then a message to
this effect is generated (
„74TC ProgFail“
).
Applications
• When using two binary inputs, malfunctions in the trip circuit can be detected under all circuit breaker con-
ditions.
• When only one binary input is used, malfunctions in the circuit breaker itself cannot be detected.
Prerequisites
A requirement for the use of trip circuit supervision is that the control voltage for the circuit breaker is at least
twice the voltage drop across the binary input (V
ct
> 2 · V
BImin
).
Since at least 19 V are needed for the binary input, the supervision can only be used with a system control
voltage of over 38 V.
2.8.2.1
Description
Supervision with Two Binary Inputs
When using two binary inputs, these are connected according to Figure 2-44, parallel to the associated trip
contact on one side, and parallel to the circuit breaker auxiliary contacts on the other.
Figure 2-44
Principle of the trip circuit supervision with two binary inputs
Содержание SIPROTEC 7SJ61
Страница 368: ...Technical Data 4 22 Dimensions SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 368 ...
Страница 436: ...Appendix A 11 Measured Values SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 436 ...
Страница 438: ...Literature SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 438 ...
Страница 450: ...Glossary SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 450 ...
Страница 454: ...Index SIPROTEC 7SJ61 Manual C53000 G1140 C210 1 Release date 02 2008 454 ...