We are facing a serious problem in the lube oil cooling fan . The cooling fan breakers keep failing, due to shattering command on/off from Mark VI as it’s shown below:
31-JUL-2008 18:49:34.174 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.174 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.201 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.201 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.213 G6 1 0x14 EVT
31-JUL-2008 18:49:34.213 G6 0 0x15 EVT
31-JUL-2008 18:49:34.213 G6 1 0x14 EVT
31-JUL-2008 18:49:34.213 G6 0 0x15 EVT
31-JUL-2008 18:49:34.253 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.253 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.253 G6 0 0x14 EVT
31-JUL-2008 18:49:34.253 G6 1 0x15 EVT
31-JUL-2008 18:49:34.253 G6 0 0x14 EVT
31-JUL-2008 18:49:34.253 G6 1 0x15 EVT
31-JUL-2008 18:49:34.279 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.279 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.293 G6 1 0x14 EVT
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31-JUL-2008 18:49:34.332 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.332 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.334 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.334 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.357 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.357 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.373 G6 1 0x14 EVT
31-JUL-2008 18:49:34.373 G6 0 0x15 EVT
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31-JUL-2008 18:49:34.373 G6 0 0x15 EVT
31-JUL-2008 18:49:34.413 G6 0 0x14 EVT
31-JUL-2008 18:49:34.413 G6 1 0x15 EVT
31-JUL-2008 18:49:34.413 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.427 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
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31-JUL-2008 18:49:34.443 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.443 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.454 G6 1 0x14 EVT
31-JUL-2008 18:49:34.454 G6 0 0x15 EVT
31-JUL-2008 18:49:34.454 G6 1 0x14 EVT
31-JUL-2008 18:49:34.454 G6 0 0x15 EVT
31-JUL-2008 18:49:34.491 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.491 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.493 G6 0 0x14 EVT
31-JUL-2008 18:49:34.493 G6 1 0x15 EVT
31-JUL-2008 18:49:34.493 G6 0 0x14 EVT
31-JUL-2008 18:49:34.493 G6 1 0x15 EVT
31-JUL-2008 18:49:34.522 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.522 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.533 G6 1 0x14 EVT
31-JUL-2008 18:49:34.533 G6 0 0x15 EVT
31-JUL-2008 18:49:34.533 G6 1 0x14 EVT
31-JUL-2008 18:49:34.533 G6 0 0x15 EVT
31-JUL-2008 18:49:34.574 G6 0 0x14 EVT
31-JUL-2008 18:49:34.574 G6 1 0x15 EVT
31-JUL-2008 18:49:34.574 G6 0 0x14 EVT
31-JUL-2008 18:49:34.574 G6 1 0x15 EVT
31-JUL-2008 18:49:34.575 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.575 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.601 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.601 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.613 G6 1 0x14 EVT
31-JUL-2008 18:49:34.613 G6 0 0x15 EVT
31-JUL-2008 18:49:34.613 G6 1 0x14 EVT
31-JUL-2008 18:49:34.613 G6 0 0x15 EVT
31-JUL-2008 18:49:34.653 G6 0 0x14 EVT
31-JUL-2008 18:49:34.653 G6 1 0x15 EVT
31-JUL-2008 18:49:34.653 G6 0 0x14 EVT
31-JUL-2008 18:49:34.653 G6 1 0x15 EVT
31-JUL-2008 18:49:34.661 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.661 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.679 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.679 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.693 G6 1 0x14 EVT
31-JUL-2008 18:49:34.693 G6 0 0x15 EVT
31-JUL-2008 18:49:34.693 G6 1 0x14 EVT
31-JUL-2008 18:49:34.693 G6 0 0x15 EVT
31-JUL-2008 18:49:34.733 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.733 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.733 G6 0 0x14 EVT
31-JUL-2008 18:49:34.733 G6 1 0x15 EVT
31-JUL-2008 18:49:34.733 G6 0 0x14 EVT
31-JUL-2008 18:49:34.733 G6 1 0x15 EVT
31-JUL-2008 18:49:34.757 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.757 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.774 G6 1 0x14 EVT
31-JUL-2008 18:49:34.774 G6 0 0x15 EVT
31-JUL-2008 18:49:34.774 G6 1 0x14 EVT
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31-JUL-2008 18:49:34.814 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.814 G6 0 0x14 EVT
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31-JUL-2008 18:49:34.823 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
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31-JUL-2008 18:49:34.843 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.843 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.854 G6 1 0x14 EVT
31-JUL-2008 18:49:34.854 G6 0 0x15 EVT
31-JUL-2008 18:49:34.854 G6 1 0x14 EVT
31-JUL-2008 18:49:34.854 G6 0 0x15 EVT
31-JUL-2008 18:49:34.892 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.892 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.894 G6 0 0x14 EVT
31-JUL-2008 18:49:34.894 G6 1 0x15 EVT
31-JUL-2008 18:49:34.894 G6 0 0x14 EVT
31-JUL-2008 18:49:34.894 G6 1 0x15 EVT
31-JUL-2008 18:49:34.924 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.924 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:34.934 G6 1 0x14 EVT
31-JUL-2008 18:49:34.934 G6 0 0x15 EVT
31-JUL-2008 18:49:34.934 G6 1 0x14 EVT
31-JUL-2008 18:49:34.934 G6 0 0x15 EVT
31-JUL-2008 18:49:34.974 G6 0 0x14 EVT
31-JUL-2008 18:49:34.974 G6 1 0x15 EVT
31-JUL-2008 18:49:34.974 G6 0 0x14 EVT
31-JUL-2008 18:49:34.974 G6 1 0x15 EVT
31-JUL-2008 18:49:35.014 G6 1 0x14 EVT
31-JUL-2008 18:49:35.014 G6 0 0x15 EVT
31-JUL-2008 18:49:35.014 G6 1 0x14 EVT
31-JUL-2008 18:49:35.014 G6 0 0x15 EVT
31-JUL-2008 18:49:35.053 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.053 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.054 G6 0 0x14 EVT
31-JUL-2008 18:49:35.054 G6 1 0x15 EVT
31-JUL-2008 18:49:35.054 G6 0 0x14 EVT
31-JUL-2008 18:49:35.054 G6 1 0x15 EVT
31-JUL-2008 18:49:35.080 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.080 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.093 G6 1 0x14 EVT
31-JUL-2008 18:49:35.093 G6 0 0x15 EVT
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31-JUL-2008 18:49:35.093 G6 0 0x15 EVT
31-JUL-2008 18:49:35.132 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
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31-JUL-2008 18:49:35.133 G6 0 0x14 EVT
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31-JUL-2008 18:49:35.158 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.158 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.174 G6 1 0x14 EVT
31-JUL-2008 18:49:35.174 G6 0 0x15 EVT
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31-JUL-2008 18:49:35.215 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
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31-JUL-2008 18:49:35.254 G6 1 0x14 EVT
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31-JUL-2008 18:49:35.295 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
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31-JUL-2008 18:49:35.333 G6 1 0x14 EVT
31-JUL-2008 18:49:35.333 G6 0 0x15 EVT
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31-JUL-2008 18:49:35.333 G6 0 0x15 EVT
31-JUL-2008 18:49:35.374 G6 0 0x14 EVT
31-JUL-2008 18:49:35.374 G6 1 0x15 EVT
31-JUL-2008 18:49:35.374 G6 0 0x14 EVT
31-JUL-2008 18:49:35.374 G6 1 0x15 EVT
31-JUL-2008 18:49:35.376 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
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31-JUL-2008 18:49:35.398 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.398 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.414 G6 1 0x14 EVT
31-JUL-2008 18:49:35.414 G6 0 0x15 EVT
31-JUL-2008 18:49:35.414 G6 1 0x14 EVT
31-JUL-2008 18:49:35.414 G6 0 0x15 EVT
31-JUL-2008 18:49:35.453 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.453 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.454 G6 0 0x14 EVT
31-JUL-2008 18:49:35.454 G6 1 0x15 EVT
31-JUL-2008 18:49:35.454 G6 0 0x14 EVT
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31-JUL-2008 18:49:35.482 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.482 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.494 G6 1 0x14 EVT
31-JUL-2008 18:49:35.494 G6 0 0x15 EVT
31-JUL-2008 18:49:35.494 G6 1 0x14 EVT
31-JUL-2008 18:49:35.494 G6 0 0x15 EVT
31-JUL-2008 18:49:35.532 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.532 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.533 G6 0 0x14 EVT
31-JUL-2008 18:49:35.533 G6 1 0x15 EVT
31-JUL-2008 18:49:35.533 G6 0 0x14 EVT
31-JUL-2008 18:49:35.533 G6 1 0x15 EVT
31-JUL-2008 18:49:35.559 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.559 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.573 G6 1 0x14 EVT
31-JUL-2008 18:49:35.573 G6 0 0x15 EVT
31-JUL-2008 18:49:35.573 G6 1 0x14 EVT
31-JUL-2008 18:49:35.573 G6 0 0x15 EVT
31-JUL-2008 18:49:35.613 G6 0 0x14 EVT
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31-JUL-2008 18:49:35.613 G6 0 0x14 EVT
31-JUL-2008 18:49:35.613 G6 1 0x15 EVT
31-JUL-2008 18:49:35.619 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.619 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.638 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.638 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.653 G6 1 0x14 EVT
31-JUL-2008 18:49:35.653 G6 0 0x15 EVT
31-JUL-2008 18:49:35.653 G6 1 0x14 EVT
31-JUL-2008 18:49:35.653 G6 0 0x15 EVT
31-JUL-2008 18:49:35.693 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.693 G6 1 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.693 G6 0 0x14 EVT
31-JUL-2008 18:49:35.693 G6 1 0x15 EVT
31-JUL-2008 18:49:35.693 G6 0 0x14 EVT
31-JUL-2008 18:49:35.693 G6 1 0x15 EVT
31-JUL-2008 18:49:35.724 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running
31-JUL-2008 18:49:35.724 G6 0 L52QC4 SOE Lube Oil Cooler Fan #4 Running

 

Fahad,

I've never heard of a "shattering command" and your problem statment is very short on pertinent details, but I'll take a stab at this one anyway.

I'm going to assume you have redundant lube oil cooling fans, and that the Mark VI is turning them on and off so often that the breakers are failing. Our 7FA's don't have air cooled lube oil coolers because we have closed loop cooling water systems, however, we do have redundant fans such as the turbine compartment cooling fans, the bearing tunnel cooling fans, and so on.

All these fans have air pressure switches that provide positive verification that minimum outlet pressures are being maintained. It is typical of GE to install proof-switches (operating status feedback) to verify operation of most any motor driven device, whether it is a pump or fan or whatever. GE generally does not use contactor pick-up to verify run status. However, their control sequence programs (CSPs) don't necessarily handle feedback device failure very well.

In our case, if the lead fan is running, and the discharge air pressure switch opens due to loss of adequate air pressure or bouncing of the switch contacts as the switches age, the standby fan will be started. If its' discharge pressure switch begins to open, we'll have a runback. So our CSP is written to protect the turbine by reducing load if proof of running is lost, even if the fan is actually running. It sounds like your CSP may be written to slam the motors on and off on loss of feedback, which would be a mistake. Again, I'm just guessing.

Solutions to our situation are usually to put in new switches if the contacts are failing, or lower the setpoints if they're a bit too close to the operating pressure. Until we can get to that, we'll usually force the output on to keep the lead fan running and force the feedback input to prevent runback.

In your case, you may need to force the fan(s) on and maybe the feedback input(s) on, or if your not familiar with forcing I/O, to temporarily install a hard wire jumper to keep the fan(s) turned on and the feedback input on while you trouble shoot your proof switches, assuming you have something that performs this function.

Good luck.

 

This may be too simple.
Turn off cooling fan #4.

What are cooling fans #1,#2, and #3 doing?

 

I believe what the originator was trying to say is that there was a "chattering" logic signal in the Mark VI, something also referred to as a "dithering" signal, which appears to be changing state many times per second and causing the motor starters and/or their circuit breakers to prematurely fail.

First of all, if the "breakers" (contactors) are failing, the first thing to do is to put the motor starter's HAND-OFF-AUTO switch in HAND to stop the contactor from toggling so quickly. Of course one will need to monitor the L.O. Header Temperature to be sure it doesn't get too low, and if it does, then one should put the switch to OFF and/or open the starter's breaker to stop the fan. (What's too low? A L.O. Header Temperature below approximately 80 deg F may start to cause bearing vibration levels to increase.)

If the relay output from the Mark VI is changing state very quickly and causing the contactor to pick up and drop out very quickly damaging the contactor and/or the starter's breaker, one needs to stop the contactor from chattering so quickly. It might mean that it will require some manual operation and attention, but so be it. If the unit is being cycled throughout the day, one needs to manually operate the cooling fan as necessary until the cause of the relay output chattering can be resolved.

Second, one needs to be sure of the "permissives" for starting the fans, that they are not changing state very quickly and causing the output relay(s) to change state. If it's just a speed signal that starts and stops the cooling fans, then it's probably something wrong with the relay on the output card or the VCRC (it's presumed that a VCRC is driving a TRLY card with the relay mounted on it). Are they any Diagnostic Alarms related to this chattering relay output?

Have you tried forcing the relay output to a logic "1" to see if the relay will stay picked up when the logic signal driving it is not toggling? If so, what happened?

If it's a single relay on one TRLY card that is chattering, I would first try to replace the relay. You should lift the wires to that relay that are connected to the cooling fan's motor starter circuit before removing the existing relay and inserting the new relay. If the new relay also chatters, I would suspect the VME card driving it (usually a VCRC card; check Toolbox to be sure, and to be sure which one or which ones need(s) to be replaced; the card may be a "simplex" card or it might be a TMR card, but if it's a TMR card I would suspect some associated Diagnostic Alarms to be present).

So, there's a few things to check. But, the important thing is to stop the chattering relay from damaging the contactor or its breaker, and eventually, the motor! Operate the cooling fan manually until the problem can be resolved to prevent damaging the contactor or the breaker or the motor and fan. Some of these motors are directly coupled to the fan; others drive the fan through belts or evey a gear drive mechanism. Repeated cycling of the motor's contactor can cause problems for the motors bearings, windings, the belts, the gear drive mechanism, and even the fans (they are usually fairly large and have some large associated inertias).

Let us know how this progresses.

 

Hello Fahad,

check the output signal in the EGD, it should be configured as ''READ''. I think in your case, it is configured as ''WRITE''. In this case, there will be a mismatch between EGD command and controllers command.

Regards
Omar