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The machine in question experienced a trip on low atomising air pressure ratio trip (LAAPRTRP_ALM) during ignition.
The trip is only armed when the machine has fired ( L28FDX) at this point if the ratio between the absolute atomising air pressure (AAP4) and Absolute CPD (CPDABS) is less than 1.05 for 3 seconds the trip is initiated.
After investigation and comparisons to previous mark 6 projects it seems the OEM has reduced the buffer time from 8 seconds to 3 seconds? Still under review but wondering if anyone has similar logic to this?
This logic was implemented under a til to prevent an over speed should liquid fuel be present in the atomising air manifold, hence the reason for maintaining a greater pressure than the CPD.
The trip is only armed when the machine has fired ( L28FDX) at this point if the ratio between the absolute atomising air pressure (AAP4) and Absolute CPD (CPDABS) is less than 1.05 for 3 seconds the trip is initiated.
After investigation and comparisons to previous mark 6 projects it seems the OEM has reduced the buffer time from 8 seconds to 3 seconds? Still under review but wondering if anyone has similar logic to this?
This logic was implemented under a til to prevent an over speed should liquid fuel be present in the atomising air manifold, hence the reason for maintaining a greater pressure than the CPD.