A
In my plant GE 9fa unit during running got tripped due to Mark VI channel R and R failure (2 out of 3) also in HMI Mark VI rack status page r&t i/o state rack status was showing "0" red color instead of 106 (green color).
Observation after unit tripped.
1. All drives / motors got started except 88hq 1&2 with lift oil, (lube oil aux p/ps 1,2 emergency lube oil p/p, emergency seal oil p/p were running). Hence same time unit RPM was 3000 with decreasing state without lift oil.
2.In HMI Mark VI rack status page r&t i/o state rack status was showing "0" red color instead of 106 (green color). Hence Pos volt 60.4 vdc neg volt -57.7, diff volt- 2.7vdc ( normal). In alarm page diagnostic alarm slot 7 VTUR was persiting in same channel
3. After rebooting of the Mark VI channel r & t (controller) from PDM all drives got normal with hydraulic p/ps, lift oil, turning gear motor, unit reached to 6 rpm.
Could you please describe what could be the reasons for the failure of Mark VI channel r & t (controller)?
Note: Same unit 2 times tripped by same reason in a week.
Observation after unit tripped.
1. All drives / motors got started except 88hq 1&2 with lift oil, (lube oil aux p/ps 1,2 emergency lube oil p/p, emergency seal oil p/p were running). Hence same time unit RPM was 3000 with decreasing state without lift oil.
2.In HMI Mark VI rack status page r&t i/o state rack status was showing "0" red color instead of 106 (green color). Hence Pos volt 60.4 vdc neg volt -57.7, diff volt- 2.7vdc ( normal). In alarm page diagnostic alarm slot 7 VTUR was persiting in same channel
3. After rebooting of the Mark VI channel r & t (controller) from PDM all drives got normal with hydraulic p/ps, lift oil, turning gear motor, unit reached to 6 rpm.
Could you please describe what could be the reasons for the failure of Mark VI channel r & t (controller)?
Note: Same unit 2 times tripped by same reason in a week.