Hi..

There is a L30CC alarm (Fire Protection system trouble) at our site. What is this alarm? Shut off valve is open, CO2 pressure is normal. There is F09 alarm on the fire unit. What is this?

L45FTX1, L94F1 and L94F2 what is these signals?

Thank you for your reply?

 

Dear MARK V,

it would be very helpful to others trying to help you if you provide specific information as the type of turbine, year installed, control system in use, etc. In this case it would be helpful if you specify the make and model of fire system in use because otherwise it is up to others to assume what you have, and the answers provided are usually more general and less specific.

I assume this is some type of GE Frame 7 machine, either 7FA or EA. You have a control system of either MKV or MKVI. It is equipped with a Chemetron Micro 1 EV panel. With these assumptions in mind here is what I offer.

L30CC is a generic general alarm contact input from the fire protection system to the gas turbine control system. You need to look at the fire protection panel to trace the problem further.

F09 alarm indicates an open in the Zone #2 input loop. This is the fire system detection loop composed of several heat detector switches. There are usually two loops of heat detectors. This fault indicates that zone #2 has an open in the loop. This is typically due to a loose or faulty connection at one of the heat detectors or terminal boxes. You will need to reference your site wiring termination drawings to diagnose the problem.

L45FTX1 is usually a contact input from the 45FTX relay which is driven from the fire protection system. This relay typically shuts down all the fans and heaters for the various compartments and signals the gas turbine control system that a release of CO2, halon or other media is about to discharge and the turbine will be tripped.

L94F1 and F2 usually indicate a release has started of CO2 or Halon or other material in a specific compartment, usually either the Accessory/Turbine compartment, or the load/#2 bearing compartment.

These answers are very general due to the lack of information provided. Many of these signals and descriptions are very turbine and site specific, and depend on programming of the fire system controller and gas turbine control system in use. I hope this helps answer some of your questions.

 

Hi,

The alarm is probably the result of the F09 condition on the fire protection system display. There should be a listing/decryption of the codes somewhere on the inside of the door of the fire protection panel, or in the manufacturer's instruction book.

L45FTX1 is <b>usually</b> an output of the Speedtronic that indicates a fire has been reported to the Speedtronic and the turbine is to be tripped. Sometimes, it's the signal name of the input to the Speedtronic that a fire has been detected and the turbine should be tripped. It depends on who configured the Speedtronic and on what day it was configured.

L94F1 and L94F2 are usually the signal names assigned to discrete inputs to say that a fire was detected in Zone 1 or Zone 2 of the turbine-generator fire protections system.