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Procedure Number

Operation Methods for SSS

Date: 30-08-2004

Slow Power Abort Check in SSS

Prepared By

Checked and Approved By

Sridhar Sethumadhavan

IGCAR, Kalpakkam

K.P. Kesavan Nair

BARC, Mumbai

Dept. of Atomic Energy, India

Vinod Chohan

AT/MTM

CERN, Switzerland.

Procedure Number

Title

OM-SSS-PT4

Slow Power Abort test for SSS magnets

1. AIM

The aim of the test is check the effectiveness of the Slow Power Abort function of the power converter which supplies the SSS with high current (up to 12,850 A) during training. During slow power abort, the power converter brings down the current in the SSS at a slower rate of 125 A/s.

    TEST IN BRIEF

Ramp-up 1kA in the SSS and then trigger a Slow Power Abort.

The test is similar to the test conducted on Dipole magnets; the difference is highlighted in italics.

3. PREPARATIONS

    Check the polarity of the SSS (i.e. whether it is a Right or a Left SSS) and put the Polarity Rotary Switch accordingly, carefully following the procedure for assigning rotary switch position.
    Put the Bench Rotary Switch to the required bench position. (for example D1) carefully following the procedure for assigning rotary switch position.
    Assign/check the rotary switch position to the active bench using local Sun Server. Ensure that the required power supply is allocated (by the server) to the test bench chosen.
    Inform the cryo-operator about the powering of the SSS at 1kA and get his/her OK signal for powering the SSS from cryogenic point of view.
    Note down the TT821 temperature in the logbook. It has to be stable around 1.9 K.
    Ensure that all the four main quench heater power supplies are fully charged (the ready/green LED should be glowing). Check that QH2 “YT211” & QH3”YT121” are connected to dummy resistors.
    Make sure all cards in main dipole main dipole safety matrix are enabled.
    Ensure that the “Magnet Protection” selector switch in the switch box of quench heater power supplies is in “HF” position. This will ensure that the main quench heater power supplies will be discharged in to the HF heaters when required.
    Ensure that the “Min. Energy” selector switch in the switch box of quench heater power supplies is in “0” position. This will ensure that the minimum energy power supply will not be connected to any heaters.
    Ensure that the Digital Voltmeter calibrated to read IDCCT current as mV DC (15 kA = 1.5 V) is on. Ensure that it is chosen to record the maximum current, by pressing the MIN/MAX button once (the MAX indication should glow).
    Keep the shafts (quench antennas) of both apertures in longitudinal Q-loc position and horizontal. This will ensure highest sensitivity of the quench antennas for signals, though no quench is expected for this current. In case no shafts are installed in the SSS, ignore this step.
    Set the switch box in the mobile rack of the TRU (Twin Rotating Unit) to “Remote” position for both the apertures A1 and A2. This will ensure that the switching of the detector coils to Q-Loc position will be controlled by TEMA.

4. LAUNCHING THE TEST

The test is launched from the server in the SM 18 Control Room executing the Test Master (TEMA) for the cluster concerned. The procedure assumes that TEMA is already running in the corresponding cluster.

    Ensure that the proper bench is chosen in TEMA and that the SSS name is correct.
    Select SSS_Power_test_x1.seq from List of Sequence and then select RampTo_1kA and provoke Slow PA_NoShafts_x1.tst from List of tests of the Sequence from TEMA. Note: Choose x1 option if you are in bench1 of the cluster. Choose x2 option if you are in bench2 of the cluster .
    Click Check Application. This will open the following main LabVIEW windows namely LF_Web.vi (where the SSS temperature can be read), HFMF ControlStatus Panel.vi (HF Data Acquisition) and InstrumentStatus And Control.vi (LF Data Acquisition) in the left display terminal and one LabVIEW application namely the PS_MainPanel.vi (power) on the right display terminal.
    When the Check Applications button is free, click Run Application.
    Pay attention to the activities on the screen. It first checks all the necessary interlocks, arms the HF and LF data acquisitions and finally switches on the power converter through the power program.

NOTE: In case of PLC faults, refer page 6 “What to do in case of PLC faults?”

    Confirm that the current in the SSS starts rising at the predetermined rate, as shown in the PS_MainPanel.vi window.
    Confirm that the HF and LF Data acquisitions are fully armed. (Refer diagram1.) This can be confirmed by reading the latest status on the message windows of HFMF ControlStatus Panel.vi (HF) and InstrumentStatus And Control.vi (LF) respectively.
    Wait for current to reach 1 kA.
    Check the voltmeter reading, which should show nearly 0.1000 V(corresponding to 1kA). Change the voltmeter setting so that it does not hold maximum value (MAX/MIN indication should be off).
    TRIGGER : Press the red push-button in the Slow Power Abort card in the main safety matrix crate. This will signal the power converter to bring down the SSS current at 125 A/s.
    Confirm that the current in the SSS has decreased to zero.
    In case of a quench during this test, note down the name of the file created in the message windows of HFMF ControlStatus Panel.vi (HF) and InstrumentStatus And Control.vi (LF) and analyze the results of the file . Inform the test co-ordinator.
    Enter the test in the Test Sequence.

5. CONCLUSIONS

The test is successful if the current in the SSS is brought to 0 A slowly (at 125 A/s) when triggered, without any quench. This test does not normally generate any file, unless it quenches during ramping up or while trying to slow-power abort.


Checklist for “Slow Power Abort Check at 1 kA”

PREPARATIONS

1

Polarity Rotary Switch for is in the correct polarity position. (Right or Left)

O Yes O No

2

Power Converter Rotary Switch is in the proper bench position.

O Yes O No

3

Switch box for both apertures of the mobile rack are set to “Remote” position.

O Yes O No

4

Shafts of both apertures of the mobile rack are in Q-loc (longitudinal and horizontal) position. (Ignore this step, in case there are no shafts).

O Yes O No

5

“Magnet Protection” selector switch on the switch box of the main quench heater power supplies is in “HF” position.

O Yes O No

6

Min. Energy selector switch on the switch box of main quench heater power supplies is in “0” position.

O Yes O No

7

Check that QH2 “YT211” & QH3”YT121” are connected to dummy resistors.

O Yes O No

8

All the four main quench heater power supplies are charged.

O Yes O No

9

All the cards in safety matrix are enabled.

O Yes O No

10

Voltmeter for reading the IDCCT current is in mV range and set to hold the maximum value.

O Yes O No

11

Required power supply is allocated (by the server) to the test bench.

O Yes O No

WHILE LAUNCHING THE TEST

1

Active bench and SSS name are properly chosen in TEMA.

O Yes O No

2

Both HF and LF acquisitions are armed.

O Yes O No

3

Test type is “tb – Ramp to 1 kA, and provoke a Slow Power Abort by acting on safety matrix card”

O Yes O No

AFTER TRIGGER

1

No file was created for this test.

O Yes O No

2

Entered in the Test Sequence.

O Yes O No


What To Do In Case Of PLC Faults ?

    In case any of the conditions necessary for launching a selected test are not satisfied, then a window with the message “Faults present in PLC” will appear.
    Press “Ok”. Another window with message “Do you still want to load HF and LF data acquisitions?”.
    Press “no” and then acknowledge the message “Faults present in PLC”.
    Now, click “Check Faults” in the “TM_Main_Panel.vi” to get a list of conditions not satisfied in the PLC for the test chosen presently, each of which is shown in red.
    Now press “Check Faults” in the “PS_MainPanel” and then press “Read and Reset” to clear any memorized fault s which might have come during earlier tests

How To Check Whether The HF And LF Data Acquisition Systems Are Armed Properly ?

Diagram 1

Revised in November 2004 1

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