in our site five machines GE frame6b. three machine Speedtronic drive by MKIV. in two machine suddenly happened <R>, <S>, <T> communication link inoperative in same time. the operation screen hold no action. The turbines not get ready by loss of control <R>, <S>, <T>. in the first check the the power supply for <C> its normal<pre>
<PS.C> P5 To DCOM 4.99 VDC
P15 15.08 VDC
N15 -15.14 VDC
P28 27.69 VDC</pre>
and check the Cable link RS232 normal. All LED red and yellow are done existing means all card active and healthy. The R, S, T, and C are light RED LED happened in main operation board. replacement the two cards HCMC but same result. during reboot <C> to check the RAM, i get HCMC2B Fail and HCMC2D fail. there is no card in slot position 2B !? but suspicion for RAM in 2D replacement the card in position 2D by new card with RAM get same result.
i will be thanks anybody have solution idea to be fix this problem.
<PS.C> P5 To DCOM 4.99 VDC
P15 15.08 VDC
N15 -15.14 VDC
P28 27.69 VDC</pre>
and check the Cable link RS232 normal. All LED red and yellow are done existing means all card active and healthy. The R, S, T, and C are light RED LED happened in main operation board. replacement the two cards HCMC but same result. during reboot <C> to check the RAM, i get HCMC2B Fail and HCMC2D fail. there is no card in slot position 2B !? but suspicion for RAM in 2D replacement the card in position 2D by new card with RAM get same result.
i will be thanks anybody have solution idea to be fix this problem.