Frame 7EA Gas Splitter Valve Verification

C

Thread Starter

CuriousOne

We recently had a turbine trip after fired shutdown due to stop ratio valve position failure. To make a long story short, we found that the flexible coupling to the RVDT had slipped. Repair made.

We decided to verify all valves in the gas control system and autocal them after we ensured the valves were mechanical sound.

We found that the gas control valve had the overstroke issue I had read about in another thread and adjusted the 100 in acalib.dat to 116.863. Success again.

We cannot however get the splitter valves to autocal. NOT REACH 50% TOWARD + SAT. WITHIN 5 SEC. The valves are mechanical sound and the LVDT values measured agree with IO Configurator. We are not particularly concerned but would like to be able to use autocal to make the values in RAM perfect every time.

We believe it may be something in acalib.dat because the valves fail open. We do not believe null bias is an issue.

Helpful comments are welcomed.
 
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