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  1. A

    PR Scale for Magnetic Pick-ups of Flow Divider and Shaft Speed

    PR scale for flow dividers are usually measured in pulses denoted by fql_pr in the sequencing control. it is measured in hertz per gpm (flow) and measures the liquid fuel going into the nozzles. Fql_pr is taken as feedback and used to control the liquid fuel bypass control valve to limit the...
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    I have a fault in this control circuit of the soft star, and this is the schematic of the soft star

    Check the relay for any fault alarm, perform megger test in the 3 phases of the motor with respect to each phase and also , measure the starting current and see how many times it is higher than the usual current value (although one should note starting current is usually higher than normal...
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    Gas turbine speed raise and lower setpoints delay logic

    @WTF? Thanks for the prompt reply. The GT is used to drive a 20 MW sync generator in a captive power plant. I have checked the control specification provided with mark 6e and did not find anything. The GT is run in droop mode with manual loading and sharing, we dont use auto loading or...
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    LM2500 + Steam turbine Combined cycle operating modes

    Hey! I have some experience in running GE MS5001 gas turbine (combined with HRSG in cogen cycle) along with Steam turbine all in droop mode. Please share any queries you might have regarding the same.
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    Abbreviation of name signals in Mark VIe logic

    Hello, mark6e abbreviations are generally found with full forms and related information in the OEM documentation. I would suggest you visit the same for proper clarification. As per my experience, CA is usually used to designate the servo current output. CAGV for example determines the servo...
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    Gas turbine speed raise and lower setpoints delay logic

    Hi, just wanted some clarification regarding the time delay which is provided in speedtronic logic for speed setpoint raise and lower commands. We have GE based ms5001 GT with mark6e. There is a delay of 3-5 seconds in our GTs (K70rly). I would like to know why a time delay is required for...
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    Deviation in feedback and command to servo for STG governor control

    The following steps can be taken to troubleshoot Servo valve actuation in STG (assuming you have servo electrohydraulic actuators for HP, LP valves as the case maybe for extraction type or condensing type turbines): 1. While unit is shutdown, Static test of servo valves should be done by...
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    Command State Block(rung) in Mark 6e control system pertaining to GE Gas turbine control.

    Revisiting this thread after a long time, sorry for the delay. GT mix fuel run was successful. Thanks to everyone who helped me in answering my questions. L43FG, L43FU, L43FM block is clear to me now. The high spread issue was solved was replacing the nozzles, check valves and fuel flow divider...
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    Command State Block(rung) in Mark 6e control system pertaining to GE Gas turbine control.

    Hello Again! apologies for the late response. Our machines are designed to run on NG, HSD and naphtha. The command state block is somewhat clear to me at this point. The presets and permissive are basically required to be true and then the corresponding logic-out bit is high and passed on...
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    Command State Block(rung) in Mark 6e control system pertaining to GE Gas turbine control.

    Dear wtf (interesting name), I did alrey explore the help button wherein I came across the mask constants about which I asked in the question. I want more clarification on the rung block as the help section did not prove useful at all. There's some mention about the MSB and LSB of the mask...
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    Command State Block(rung) in Mark 6e control system pertaining to GE Gas turbine control.

    Hello, Can anybody explain to me the Command state (CMDSTATE) blocks (especially the L43FG rung) used in Mark 6e control system in Gas turbine control? I am fairly new to reading the logics in mark 6e and the mask constant part is really confusing me as well as the preset and permissive...
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