We have two Markvie retrofit (TMR). one of the unit, we changed out gcv, srv and lfb servo valves during maintenance and carried out lift calibration. after this we started getting, L3GRVFLT Gas ratio valve position servo trouble and L3GRVSC_ALM Stop Ratio Valve servo current fault alarms appear. PCAA_1G2A card parameters show unequal. Build and download done.(We are using PCAA core analog card for servos)
These alarms disappear.
L3GCVFLT GCV servo trouble and L3GCVSC_ALM GCV servo current fault alarms appear. Again PCAA_1G2A parameters build and download. But fault did not reset.
Controller RST power turn off and on. Now GCV and SRV faults appear together.
No permissive to select Gas fuel.
GCV calibration tried after forcing L3ADJ1. Selected Regulator1  calibrate valve Calibrate.
<b><i>moderator's note:</i> </b> is some sort of special character that does not show up correctly.
Window appears: Auto calibrate: Could not achieve calibration mode. Check if the calibration mode permissive is set.
Same case for SRV
LVDT position and Excitation values are normal in ToolBox
1Servo Output tab shows current of 0.15 % for 65GC (GCV) and 0.11% for 90SR (SRV). Whereas 65FP fuel bypass valve current shows 36%. (65GC and 90SR servo currents were around 30% before this trouble alarm)
GCV, SRV valve movement checked by removing servo coil wires from PCAA cards and injecting mA externally.
By injecting 1mA current, GCV valve opened fully from each coil.
Same way SRV also opened with 1 mA current in each coil.
LVDT feedback in TCAT card in full close position is around 0.70 volt for GCV and SRV. Also LVDT excitation value in ToolBox shows 7.2 V.
At this time, 65FP signal also lost and L3LFBSC_ALM Liquid fuel bypass valve servo current trouble alarm appear. Also Auxiliary Check (Servo valves) L3ACS.
Several times "Master Reset" done during the above period.
Startup is blocked by L3ACS Auxiliary Check (servos) alarm.
Controller RST power turn off and On and master reset. But situation remains same.
No abnormality in PCAA cards or UCSA controllers. No other diagnostic alarms also.
We downloaded back up software to controller, but result is same.
Is there anyone to help.....Your urgent response would be greatly appreciated....
These alarms disappear.
L3GCVFLT GCV servo trouble and L3GCVSC_ALM GCV servo current fault alarms appear. Again PCAA_1G2A parameters build and download. But fault did not reset.
Controller RST power turn off and on. Now GCV and SRV faults appear together.
No permissive to select Gas fuel.
GCV calibration tried after forcing L3ADJ1. Selected Regulator1  calibrate valve Calibrate.
<b><i>moderator's note:</i> </b> is some sort of special character that does not show up correctly.
Window appears: Auto calibrate: Could not achieve calibration mode. Check if the calibration mode permissive is set.
Same case for SRV
LVDT position and Excitation values are normal in ToolBox
1Servo Output tab shows current of 0.15 % for 65GC (GCV) and 0.11% for 90SR (SRV). Whereas 65FP fuel bypass valve current shows 36%. (65GC and 90SR servo currents were around 30% before this trouble alarm)
GCV, SRV valve movement checked by removing servo coil wires from PCAA cards and injecting mA externally.
By injecting 1mA current, GCV valve opened fully from each coil.
Same way SRV also opened with 1 mA current in each coil.
LVDT feedback in TCAT card in full close position is around 0.70 volt for GCV and SRV. Also LVDT excitation value in ToolBox shows 7.2 V.
At this time, 65FP signal also lost and L3LFBSC_ALM Liquid fuel bypass valve servo current trouble alarm appear. Also Auxiliary Check (Servo valves) L3ACS.
Several times "Master Reset" done during the above period.
Startup is blocked by L3ACS Auxiliary Check (servos) alarm.
Controller RST power turn off and On and master reset. But situation remains same.
No abnormality in PCAA cards or UCSA controllers. No other diagnostic alarms also.
We downloaded back up software to controller, but result is same.
Is there anyone to help.....Your urgent response would be greatly appreciated....