Hey folks, quick question for those of you with experience running GE frame 7AE or similar units with DLN combustors.
Recently our unit's IBH system lost its marbles. We think that its a problem with the CV positioner. Long story short, the IBH valve's feedback was becoming flaky (dropping to negative values intermittently) along with some diagnostic alarms:
An hour later GTG BH SYS FAIL TRIP IBH came in along with GT IBH CV POS TRBL and IBH FLT-CMPR LIMIT REF FAIL OPEN
The inlet bleed heat CV initially went to 100%, then the air tripped to the CV solenoid and the valve failed closed. (not sure why it did all of this)
For some reason the bleed heat reference is still calling for 100%, although the feedback and valve position are reading zero.
Now- my question is, is there any concern with running the unit with bleed heat unavailable? I understand that the IBH allows the unit to run in premix below it's normal threshold, and I have seen it operate when we move to part load. I've been making it a point to keep the unit at full load until the IBH system can be repaired but is there anything I might be missing? Ambient temps are high now so icing won't be an issue.
Thanks for any input.
Cheers,
Jeff
Recently our unit's IBH system lost its marbles. We think that its a problem with the CV positioner. Long story short, the IBH valve's feedback was becoming flaky (dropping to negative values intermittently) along with some diagnostic alarms:
- G1.PMVE-21-R 5435.403
- G1.PMVE-21-S 5435.403
- G1.PMVE-21-T 5435.403
An hour later GTG BH SYS FAIL TRIP IBH came in along with GT IBH CV POS TRBL and IBH FLT-CMPR LIMIT REF FAIL OPEN
The inlet bleed heat CV initially went to 100%, then the air tripped to the CV solenoid and the valve failed closed. (not sure why it did all of this)
For some reason the bleed heat reference is still calling for 100%, although the feedback and valve position are reading zero.
Now- my question is, is there any concern with running the unit with bleed heat unavailable? I understand that the IBH allows the unit to run in premix below it's normal threshold, and I have seen it operate when we move to part load. I've been making it a point to keep the unit at full load until the IBH system can be repaired but is there anything I might be missing? Ambient temps are high now so icing won't be an issue.
Thanks for any input.
Cheers,
Jeff