GC/MS turbo pump not speeding up
Posted: Mon May 14, 2018 8:35 pm
Agilent 5973 MS coupled to 6890 GC; was up and running and about 2 years ago, when project was over, post-doc using it vented the system and shut everything down.
Went to set it back up today and we're having issues with the turbo pump not ramping up. Rough pump seems to be working properly, no signs of a leak (plugged MS interface) - when powering up the MS it says "System vented" and if we select Pump Down, it starts up and we hear the turbo kick in, goes to about 30% speed then starts dropping down towards 0, all within 2-3 minutes. Checked vent valve, analyzer door seal, pressing while pumping down but somehow this seems to me to be indicative of something different than a large leak (the quick turbo pump speed drop-down), no?
Attempting to pump down through ChemStation, get the message "Pump Down error: MS status fault 400" and "Difficulty with the fan. The high vacuum pump is not ready. The system is in VENT state (high vacuum pump off)". Took the cover off and the fan seems in front of the turbo seems to be running fine and if we blow air over the top rotor of the turbo pump, it seems to spin properly...
Any suggestions would be appreciated.
Went to set it back up today and we're having issues with the turbo pump not ramping up. Rough pump seems to be working properly, no signs of a leak (plugged MS interface) - when powering up the MS it says "System vented" and if we select Pump Down, it starts up and we hear the turbo kick in, goes to about 30% speed then starts dropping down towards 0, all within 2-3 minutes. Checked vent valve, analyzer door seal, pressing while pumping down but somehow this seems to me to be indicative of something different than a large leak (the quick turbo pump speed drop-down), no?
Attempting to pump down through ChemStation, get the message "Pump Down error: MS status fault 400" and "Difficulty with the fan. The high vacuum pump is not ready. The system is in VENT state (high vacuum pump off)". Took the cover off and the fan seems in front of the turbo seems to be running fine and if we blow air over the top rotor of the turbo pump, it seems to spin properly...
Any suggestions would be appreciated.