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| Symptom | Potential Issue | What to do |
|---|---|---|
| Roughing pump tripped off | Radiation related fault | See - Resetting a roughing pump fault |
| Roughing pump won't start | Error message is present | Check "More..." status to see what error is listed. |
| Roughing pump won't reset an error | There is a real problem, or pump has been damaged | See - Resetting a roughing pump fault |
Turbopump tripped off | Most likely related to loss of backing pressure | Fix the problem with the roughing pump/foreline configuration then restart the turbo as described in Restarting DPS pumps. |
| Radiation related fault | See - Resetting a turbopump fault | |
| Roughing pump or turbo not responsive | Pump is in local mode, not remote | Put pump into remote mode. See Setting pumps to remote mode |
| US4 stage cannot be restarted | Probably radiation damage | See - Pump redundancy |
| Foreline valve won't open | Foreline interlocks need to be cleared | Reset foreline inerlocks interlocks from "Foreline Vlv Intlks..." panel |
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The roughing pumps have handheld controllers in the S20 FKG20-23 24 rack, second from the top shelf, sitting on the "CORNING" box:in the back of the rack, on the lower shelf:
And they look like this:
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