Description
2.9 Self-monitoring and diagnostics
3WA1 air circuit breaker
178 Equipment Manual, 02/2023, 92310000002-06
Software-assisted testing
With software-assisted testing, you can test the parts of the functional chain of the 3WA
air circuit breaker that cannot be checked with self-monitoring alone.
Test principle
The principle of software-assisted testing is that the SENTRON powerconfig
configuration software transmits a test signal (current and/or voltage) to the ETU600
electronic trip unit via the USB-C interface. The test signal is generated individually
according to the current circuit breaker protection settings and the selected test function
(LT, ST INST, N, GF, etc.).
The ETU600 treats the test signal like an actual current measured via the current
sensors and behaves as specified by the set protection parameters. The protective
function of the ETU600 is not in test mode, nor is the protection behavior affected. This
allows you to check the real protection and system behavior and also detect incorrect
protection settings.
Test signal
The test signal corresponds one-to-one to the actually measured signal after
digitalization by the analog-to-digital converter. The test signal can be formed for up to
nine measuring inputs. The test signal is generated individually by the SENTRON
powerconfig configuration software on the basis of the current protection settings of the
3WA air circuit breaker and the desired protective function trip. Many network conditions
can therefore be simulated.
Tripping
If the test signal exceeds the set limit values of the protection settings and an optionally
set delay time has elapsed, the tripping solenoid F5 is actuated. This unlatches the
breaker latching mechanism and opens the main contacts.
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