Ge Frame 9001E
I Am working on frame 9001E. can i have more information about the torque converter and its operation.
START UP * during starting* and in shutdown turbine
Because when shutdown turbine
Alarm fault torque converter in markv trip

thanks

 

When did this problem start? After a maintenance outage? After some work was performed on the torque converter?

Please provide the exact text and drop number of the alarm message(s) experienced when the torque converter isn't working properly.

There have been several torque converter implementations used with Frame 9Es over the past twenty years or so, and we would need to be able to look at the CSP of the Mark V in order to say for certain what should happen and when.

You should have received some "service manuals" or "O&M" (Operation and Maintenance) manuals with the unit, and there should be a tab in one of the volumes that gives a generic description of how the starting means (which includes the torque converter) works during starting.

I'm only familiar with one scheme which used the torque converter during cooldown operation, after shutdown, to keep the turbine shaft spinning at between 30-50 RPM (if the lube oil temperature is maintained above approximately 26 deg C). The torque converter would be positioned to maximum torque output and solenoid 20TU-2 would be energized to port Aux. L.O. Pump discharge pressure through the torque converter as the unit coasted down below approximately 100 RPM to keep the shaft spinning at between 30-50 RPM.

If the lube oil temperature falls below 26 deg C the viscosity of the L.O. would be too high for the torque being provided by the flow of L.O. through the torque converter to maintain shaft speed, and the shaft would slowly coast down to zero speed.

To get the shaft spinning again, the operator would have to select Cooldown On, which would start the electric starting motor and accelerate the shaft above a couple of hundred RPM and the starting motor would be stopped, and then again as the shaft coasted down through approximately 100 RPM 20TU-2 would be energized and Aux. L.O.
Pump discharge pressure would again be ported through the torque converter set to the max torque position to try to maintain shaft speed at approximately 30-50 RPM.

That's the only scheme I'm aware of that used the torque converter during "shutdown"--cooldown, really. And I'm not aware of any "trip" associated with problems with an inability to maintain slowroll.

I believe that some more recent Frame 9Es now use a hydraulic ratchet scheme which is bolted to the output of the torque converter, or sometimes to the shaft that is part of the Accessory Gear. But, the ratchet doesn't use the torque converter, that I'm aware of. The hydraulic ratchet will periodically rotate the turbine shaft a portion of a turn to help prevent the compressor rotor from warping when the unit has been tripped or shut down.

You should be able to find the Starting Means P&ID to review the components of starting means and the cooldown scheme, and using the P&ID along with the Starting Means system description you should be able to understand what it happening.

Reviewing the starting means sequencing in the Mark V CSP you should also be able to determine exactly how the starting means and cooldown operation are to operate.

But, without much more information, we can't provide any more help than this.