The circuit breaker spring-charged indication subfunction calculates the spring charging time.
The operation of the subfunction can be described with a module diagram. All the modules in the diagram are explained in the next sections.
Spring charge time measurement
Two binary inputs, SPR_CHR_ST and SPR_CHR, indicate spring charging started and spring charged, respectively. The spring-charging time is calculated from the difference of these two signal timings.
The spring charging time T_SPR_CHR is available in the monitored data view on the LHMI or through tools via communications.
Alarm limit check
If the time taken by the spring to charge is more than the value set with the Spring charge time setting, the subfunction generates the SPR_CHR_ALM alarm.
It is possible to block the SPR_CHR_ALM alarm signal by activating the BLOCK binary input.