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Dear All
We are having GE Frame VI gas turbine control by Mark VI control system TMR (R,S and T) having dual firing facility Gas as well as liquid. Control system was retrofitted from Mark IV to Mark VI Jan 2007. After commissioning we have problem of Servo Suicide.
VSVO card is inserted in slot 5 is for SRV (Regulator1), GCV (Regulator2) and Liquid fuel bypass servo (Regulator3). At present we are using 100% gas fuel.
VSVO card is inserted in slot 7 is for IGV (Regulator1)
TSVO termination card is common for all regulator.
Following diagnostic alarm appeared frequently after commissioning.
1. T controller Slot 5 : Fault code 47; Servo current#1 disagrees w/ ref, Suicided (regulator1) (SRV)
2. T controller Slot 5 : Fault code 47; Servo current#2 disagrees w/ ref, Suicided (regulator2) (GCV)
Above both diagnostic alarms were appeared on same day with half hour time difference. and
3. R controller Slot 7 : Fault code 47; Servo current#1 disagrees w/ ref, Suicided (IGV)
We need to reboot the processor to reset the problem. We have carried out lots of action as suggested by OEM. Like resetting null bias current, setting regulator gain, checking terminal tightness, checking cable for grounding and of course calibration on shutdown once in a year.
The setting for servo current disagree suicide is 5%. I am still confused with the alarm and how control system will calculate current difference. In Mark IV there is no such alarm was given.
And again it is required to reboot controller to reset the alarm. After reset, in two to three month continuous running same alarm came again.
We are having GE Frame VI gas turbine control by Mark VI control system TMR (R,S and T) having dual firing facility Gas as well as liquid. Control system was retrofitted from Mark IV to Mark VI Jan 2007. After commissioning we have problem of Servo Suicide.
VSVO card is inserted in slot 5 is for SRV (Regulator1), GCV (Regulator2) and Liquid fuel bypass servo (Regulator3). At present we are using 100% gas fuel.
VSVO card is inserted in slot 7 is for IGV (Regulator1)
TSVO termination card is common for all regulator.
Following diagnostic alarm appeared frequently after commissioning.
1. T controller Slot 5 : Fault code 47; Servo current#1 disagrees w/ ref, Suicided (regulator1) (SRV)
2. T controller Slot 5 : Fault code 47; Servo current#2 disagrees w/ ref, Suicided (regulator2) (GCV)
Above both diagnostic alarms were appeared on same day with half hour time difference. and
3. R controller Slot 7 : Fault code 47; Servo current#1 disagrees w/ ref, Suicided (IGV)
We need to reboot the processor to reset the problem. We have carried out lots of action as suggested by OEM. Like resetting null bias current, setting regulator gain, checking terminal tightness, checking cable for grounding and of course calibration on shutdown once in a year.
The setting for servo current disagree suicide is 5%. I am still confused with the alarm and how control system will calculate current difference. In Mark IV there is no such alarm was given.
And again it is required to reboot controller to reset the alarm. After reset, in two to three month continuous running same alarm came again.