*For now, contact the CrtExperts -- Main.anolivie - 2018-11-02

If you have been brought here then it is likely that the CRT rack lost power. The best thing to do would be contact the CrtExperts and also try and figure what caused the loss of power. Another indication that the rack lost power is if the CRT computer is turned off, which can be checked rack side or by attempting to log on to the crt network ssh np04daq@np04-crt-001. Also check the HV on the laptop. If the power went out then all channels 03.000 to 03.031 will be highlighted in red, which means the boards are not receiving HV.

Steps to bring CRT back from power outage to rack

1) Turn off the LV and make sure the HV is highlighted in red. Turn back on the CRT computer and make sure you can ssh on to the CRT network

2) Check the clock and sync from the timing system, make sure it is what we would expect

3) Check the HV table on the laptop. Make sure that all HV values are between 600-800. Sometimes we lose connection between the laptop and the CAEN unit. If this happens try unplugging the grey cat6 cable from the CAEN unit and plugging it back in. If this still doesn't work turn the CAEN system off and then back on again.

4) Check the values for the LV. Make sure NP04-PS-CRT-02 Channel 1 is set to 6.1V 2.15A, Channel 2 and Channel 3 set to 6.3V 2.5A, Channel 4 5V 0.56A. Make sure NP04-PS-CRT-01 Channel 1 and Channel 2 are set to 6.4V 2.5A. If these values need to be reset this can be done by pressing the Voltage or Current buttons on the modules, typing in the values and pressing enter.

If the LV values look good, then turn on the LV in the correct order as seen in PowerCyclingCRT

5) If the HV values look ok, turn the HV back on. This is done on the laptop. First you may have to clear the alarm in the GECO program. Click on the CLEAR ALARM button on the left hand side.


6) Start at channel 03.000 and highlight the entry under the Pw column. Press the spacebar to turn the channel on. It should take about 10 seconds for the channel to ramp up and then the row will turn green and the Pw On. If when turning on the power and the HV is ramping up but then trips again, this is probably a major hardware problem and it would be best if you contact CrtExperts.


7) Continue turning on every channel one at a time until 03.031. Wait a few seconds and make sure no channels trip while ramping back up

8) Check again the voltage and amps on the LV screen and try running the CRT again

Topic attachments
I Attachment History Action Size Date Who Comment
JPEGjpg IMG_3142.JPG r1 manage 2469.6 K 2018-11-13 - 16:09 SarahMarieHenry  
JPEGjpg IMG_3143.JPG r1 manage 2879.0 K 2018-11-13 - 16:06 SarahMarieHenry  
Edit | Attach | Watch | Print version | History: r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r2 - 2018-11-13 - SarahMarieHenry
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CENF All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2020 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback