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There is some redundancy in the system, so depending on the type of fault, the system should be able to continue to operate well enough to keep the beamline valves open if a single stage fails, but you may not be able to operate any gas sources without the full DPS operational. See the "Pump redundancy" section for more info.
Check for your problem in the table below, then see full instructions below that for how to fix the issue.
Troubleshooting guide:
| 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 | 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 from "Foreline Vlv Intlks..." panel |
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- The roughing pump is stopped (red) or disconnected (purple), or
- The foreline vacuum gauge is reading a value >1 Tor and the foreline valve is closed, or
- A warning or alarm is present in the "More..." panel of the roughing pump panel, or
- The beamline vacuum performance on a stage is not as expected, or
- Something else that I have not though of.
Step 1: Try to diagnose the problem. Determine what pump is stopped by looking at the "DPS full schematic..." panel for the symptoms listed above.
Step 2: If there is an alarm or warning listed in the "More..." panel then interpret as follows:
- Water flow low - check the water flow rate listed at the top panel. If <1 L/min then inform Doug
- Comm error, MP driver prot active, BP driver pro active - these are common radiation related faults. Attempt to reset and restart the pump.
- Any other alarm or warning - see if it clears and the pump restarts. If it doesn't then Doug can investigate more
Step 3: Reset the roughing pump error (if required)
Step 4: If pump is not responsive, or if resetting did not clear the error, then try power cycling the pump.
- See "Controller locations" to find the circuit breaker for the roughing pumps, appropriate PPE, and the correct set of breakers
- Turn off the breaker for at least 30 seconds
- Turn the breaker back on
- Check if the error is cleared and the pump will restart
Step 5: Check the status of the handheld controller
- If not, then try powering off the breaker for 30 minutes, then power back on and retry the pump
- If it still does not clear the error, then leave the power of
Resetting a turbopump fault
Setting a pump to remote mode
Controller locations
Pump redundancy
In the case of pressure rise on gauges 3259 and 3291 due to a failure of one or more pumps in the DS-DPS system, this procedure should be used to isolate the beamline and stop the pressure from rising further. See the attached document for the full procedure.
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