ALICE SPD Cooling PVSS Procedures

"A working program is one that has only unobserved bugs." [Murphy's law]

Starting the cooling.

  • Edit Wiki logbook.
  • Open PVSS (from start menu) on the cooling PC (pcpix100), project SPDCooling_20060220, start project (opens Device Editor + Navigator).
  • Click on CaV and on SPDPlant.
  • Write the loop status (ON, OFF, locked) on the logbook. To access to the loop status, double click on "children zone" on the Device_Module (see picture below, zone 1).

PVSS Device_Module
PVSS Device_Module.

  • Check that all not relevant loops (for example 1, 3, 5, 6, 7, 8) are LOCKED.
  • Then open the Bitmap (see previous picture, zone 2).
  • Write the current tank weight. The system should have been in stand-by mode or stopped after a stand-by, so the weight should not be too different from the last recorded in the logbook. If it is a big variation (higher than 1 kg), suspect a leak.
  • Check that there is roughly 1 bar difference between P.out nad P.inj (picture below). For example, P.out 1.800 ba and P.inj. 2.700 ba.

Cooling parameters
Cooling parameters.

  • From the Device_Module, open the relevant loops (for example 2 for the sector, 9 and 10 for the heaters).
  • Go to Run Mode from the Device_Module.
  • If any problem: go to Stand-by mode and then check pressures and weight.
  • After 10 minutes of RUN switch on or the heaters (next paragraph) or 7 half staves of the sector (second next paragraph).

Procedure to switch on the heaters.

  • Be sure that the loop of the heaters have been opened by at least 10 minutes (to have the liquid in the heaters).
  • Switch on the power supply on the bench (36V). Current should be ~10A.

Procedure to switch on sector.

  • Be sure that the loop of the sector has been opened by at least 10 minutes (to have the liquid in the sector).
  • Switch on LV, HV of at least 7 sector.

Emergencies for cooling system.

  • The only not interlocked problem is the presence of liquid in the compressor which happen when the current weight is 8 kg below the value after the recovering. CHECK PERIODICALLY THE WEIGHT . If too low: stop the test, go to the Stand-by mode and close the open loops.

In Case Of ALARM

  1. The interlocked power supplies should be switched OFF. If not, switch OFF all the sectors and heat generators.
  2. Click on DETAILS on the PVSS device control (next picture point 1) to identify and solve the problem. If needed, use the telephones number.
Solved the problem, the system must be reset. ATTENTION: it is possible to reset the system only three times in few minutes, after that the reset button will be blocked for an hour. If after two resets the system goes still in ALARM, please use the telephones number.
To reset the system,
  1. Click to the ACTIONS (next picture point 2) on the PVSS device control to open the Plan Control Word Editor.
  2. Activate the maintenance clicking on the corresponding check box (next picture point 3).
  3. Apply the modification clicking on APPLY (next picture point 4). On the device control, the corresponding status led (next picture point 5) becomes green.
  4. On the PLC panel, put the system in a proper state. For example, to avoid overpressure in the condenser it is wise to lock all the loops before resetting the system.
  5. Push < Reset > on the PLC front panel. Wait few minutes (~5) to be sure that there are no other problems.
  6. In the PVSS interface, it is better to put all the loops in the same configuration of the PLC panel. This to avoid surprises when the control is retaken by the PVSS interface.
  7. Retake the control of the Cooling deselecting the maintenance check box. Select also the proper status of the system, putting it equal to the PLC one (tipically RECOVERING). Click on Apply and then on CANCEL to close the Plan Control Word Editor.
  8. The Cooling is now ready again.
Maintenance activation.

After the test.

  • Go to RECOVERING mode, if you have to recover a lot of liquid in short time. ATTENTION during the RECOVERING the weight alarm is inhibited for weight incresing. So, generally, is better to go to the STANDBY. It is also better to close the open loops. If the system has to be stopped for several days (>7), after one week of STANDBY put the system in the STOP mode.

Update the logbook with at least the weight (to check possible leaks) when you start, when you finish and record any problem.
Call the 165453 ( Gianluca Guaglio) in case of troubles or 163313 (Miquel Angelo Pimenta dos Santos) just for emergencies.



-- Main.gguaglio - 30 Mar 2006
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Topic revision: r11 - 2006-07-04 - unknown
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