Present: M. Blaszkiewicz, L. Felsberger, B. Panev
BP provided feedback from the previous meeting - after discussions with colleagues, it was decieded to separate two redundant path signals going previously through one component (IC22) at the end of the chain in FPA/SPA card. The new approach is to have main singals in one (IC22) while their redundant versions (R) in the other (IC46). It is possible as there will be some other changes implemented.
BP highlighted that IC8 is a high impedance element and therefore should never experience input short (to high). It was also reiterated that there was more than ten years of operation in R2E test which already provided some insights.
The plan is to have yearly checks of interlocks, but for vacuum switches it may be every two years. 600A switches though - only LS.
It was also mentioned that all critical interlocks will be locked redundantly.
Most switches fail safe without interlocks, vacuum switches - have to be driven, therefore: they rely more on interlocks.