Hi,
Thank you in advance.
I am facing an issue MARK -IV Control system. During electrical breaker modification work time, we shut down the Mark-IV panel for 1 month after we restarted MARK-IV.
During GT trail startup, the gas turbine was tripped due to 20FG (Gas trip oil solenoid valve) is not energized. Then I checked the solenoid valve and the field side was found ok. Again started Checking the L20FGX1=1 in software but 20FGX1 relay found not energized. then again tripped.
20FGX1 relay to energize we need master protective relay is must active 4R, 4S, 4T, 4X-1, 4X-2, 4X-3, 4X-4, 4X-5 should energize then only 20FGX1 get power P28VR-4 for the relay coil. then the following list is checked.
1. All power supplies are healthy,
2. Relay power supply module P28VR is healthy
3. All RST and C core are running healthy.
4. Diagnostic alarm checked and found no alarm.
5. Checked all Fuses in the Power distribution module and found ok.
6. After starting, I checked in software L4X1=1 is active, But relay 4R, 4S, and 4T are not energized.
7. Checked 45FTX=0 (fire fighting relay) - output NC contact is getting 28VDC.
8. 4R, 4S, 4T - I Changed the new relays and tested, found the relay ok.
9. 4R, 4S, 4T - relay coil terminal 11 is getting 28VDC and 10 terminal connected to Relay drive module <RDM>
10. After shutdown GT, Then I forced L4X1=1 into the software, then I checked relay 4R, 4S, and 4T is not energized.
11. After shutdown GT, then I force L4X1=1 in software showing all <R>, <S>, <T> core showing value 1 but relay 4R, 4S, 4T not energies.
12. Then I suspected the relay driver module. <RDM> may have an issue, then HRDB Slot 'A' module interchanged between HRDB Slot 'B" after I tried it's not working and the same issue.
13. I forced L20FGX1=1 only, then I manually pressed relay by hand 4R, 4S, and 4T during that time 4X-1, 4X-2, 4X-3, 4X-4, 4X-5, after that 20FGX1 relay is active.
14. I completely restarted 2 times of MARK-IV, but the problem still exists.
Note: during relay testing time I completely isolated pumps and starting device etc..
At last, the main master protective relay 4R, 4S, and 4T are not active after the start command given, Kindly give me a suggestion to solve the problem.
Main master protection page attached for reference.
Thank you in advance.
I am facing an issue MARK -IV Control system. During electrical breaker modification work time, we shut down the Mark-IV panel for 1 month after we restarted MARK-IV.
During GT trail startup, the gas turbine was tripped due to 20FG (Gas trip oil solenoid valve) is not energized. Then I checked the solenoid valve and the field side was found ok. Again started Checking the L20FGX1=1 in software but 20FGX1 relay found not energized. then again tripped.
20FGX1 relay to energize we need master protective relay is must active 4R, 4S, 4T, 4X-1, 4X-2, 4X-3, 4X-4, 4X-5 should energize then only 20FGX1 get power P28VR-4 for the relay coil. then the following list is checked.
1. All power supplies are healthy,
2. Relay power supply module P28VR is healthy
3. All RST and C core are running healthy.
4. Diagnostic alarm checked and found no alarm.
5. Checked all Fuses in the Power distribution module and found ok.
6. After starting, I checked in software L4X1=1 is active, But relay 4R, 4S, and 4T are not energized.
7. Checked 45FTX=0 (fire fighting relay) - output NC contact is getting 28VDC.
8. 4R, 4S, 4T - I Changed the new relays and tested, found the relay ok.
9. 4R, 4S, 4T - relay coil terminal 11 is getting 28VDC and 10 terminal connected to Relay drive module <RDM>
10. After shutdown GT, Then I forced L4X1=1 into the software, then I checked relay 4R, 4S, and 4T is not energized.
11. After shutdown GT, then I force L4X1=1 in software showing all <R>, <S>, <T> core showing value 1 but relay 4R, 4S, 4T not energies.
12. Then I suspected the relay driver module. <RDM> may have an issue, then HRDB Slot 'A' module interchanged between HRDB Slot 'B" after I tried it's not working and the same issue.
13. I forced L20FGX1=1 only, then I manually pressed relay by hand 4R, 4S, and 4T during that time 4X-1, 4X-2, 4X-3, 4X-4, 4X-5, after that 20FGX1 relay is active.
14. I completely restarted 2 times of MARK-IV, but the problem still exists.
Note: during relay testing time I completely isolated pumps and starting device etc..
At last, the main master protective relay 4R, 4S, and 4T are not active after the start command given, Kindly give me a suggestion to solve the problem.
Main master protection page attached for reference.
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