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Analog inputs and outputs are typically 4-20 ma current sources, thus limited already to 20 ma. Even shorting to ground you would be unlikely to blow the fuse. Thermocouple temperature inputs are even lower current devices and RTD's are passive and have extremely low current passing through...

You can communicate Modbus to Mark V, but you may have to use RS232. To use Ethernet you need the GSM protocol. Also, I believe ABB Infi90 can communicate with GSM protocol, at least on a Mark VI - it was done on a project in Mexico. The ABB Infi90 for that project was supplied out of...

The correct answer is the differential pressure is 2 psi, neither gauge nor absolute. Some would call it 2 psid, where the "d" is for differential.

The generator power factor design limit is a MINIMUM limit, not a maximum. The generator you describe will be quite happy to run at 0.9 or higher power factor. It will be unhappy at 0.75 power factor.

The pressure and temperature compensation is the density compensation!

The gas turbine control is designed to be able to handle any load rejection. It should not go to overspeed on a breaker trip. It is usually tested during commissioning for ability to withstand a load rejection from base load (they would usually manually trip the breaker rather than induce an...

I am not entirely sure what you are looking for. For steam turbine control, for a straight steam plant, the fundamentals of droop control for gas turbine and steam turbine would be similar, assuming the boiler control can react quickly to the response of the steam turbine inlet control valves...

The reason is that the differential pressure is highest when the drum is empty. The transmitter is measuring the differential pressure between a column of water and the bottom tap on the drum. When the drum is full to the same level as the top of the water column, the differential pressure is...

GE Energy and GE Oil & Gas are both part of GE (General Electric Co.). GE Oil & Gas is actually part of GE Energy. Visit http://www.ge.com/ for more details (or perhaps more confusion).

Not without a whole lot more information than you have provided! Supplemental duct firing control (at least on GE turbines) is custom designed for each project according to customer specification (contract) requirements. You might try reading your configuration software documents and system...

Fuses provide short circuit protection, which is useful for digital outputs. It is generally not considered necessary for digital inputs, analog inputs nor analog outputs. The knife switches are useful for maintenance and testing.

OK, apparently you do have a fired shutdown on a Mark II control, and it was set up to trip the unit after the speed drops below 75%, and the control works properly on distillate fuel. On gas fuel, the speed fails to drop below 80%. Assuming no one has changed control settings for gas fuel...

1. My recollection is that Mark II and older controls did not have the "fired" shutdown which keeps flame on until around 40% speed. 2. I am guessing that your machine is 5001R, mechanical drive (compressor or pump) rather than a generator drive, and the minimum operating speed is around 80%...

CSA, You are mostly correct in your analysis. One slight error is that I know Mark I and Mark II did have an acceleration limiter during startup that tried to hold acceleration to 1% per second. There was an "accel" indicating light that would come on any time acceleration was limiting VCE...

Whenever the gas turbine is rotating (in the correct direction) the measured exhaust pressure should be positive. The air is flowing from the GT exhaust plenum up the stack to the atmosphere; therefore the pressure at the exhaust plenum must be positive. Otherwise the air would flow down the stack!

You may have to talk to GE to answer this. There is a lot of things that happen in a start sequence. It would not be easy to re-design the sequence to re-start from anywhere in the shutdown sequence. Once you lose flame, you are stuck with going back down to firing speed because you can't...

The reading should be positive, at least any time the unit is running. (If shut down, and there is wind blowing across the top of the stack, you might get a small negative reading.) You don't say what, if any, equipment is in the exhaust system. If you have heat recovery equipment like an...

Once the speed falls much below 14HS drop out, the gas turbine is no longer self sustaining. That means in order to restart the starting means will be required. You don't say which version of the frame 7 you have, so I don't know whether you have an LCI or a separate electric starting motor, but...

You just changed the rules. Initial question stated that the only parameter that changed was the steam flow. Now you say the gas outlet temperature dropped. So now we need all the numbers to determine what will happen to the steam temperature. Depending on how much the steam flow has changed and...

You don't say whether the steam is being heated or the steam is the heat source. If the heat exchanger is heating the steam, then the outlet steam temperature will drop. By your definition, the only parameter that has changed is the steam flow, so the heat (energy) input to the heat exchanger...