Power Cycling the CRT

Sometimes it is necessary to power cycle the CRT, but please only do so if confident in this course of action. We do not want to power cycle any more then necessary.

Setup

  1. You have to LogInToCRTServer to follow these steps
  2. Check that the CRT actually needs to be power cycled:
    pollAllCRTLV.sh

    You should see something like:

    #Top power supply:
    #channel 1 channel 2
    +6.396375E+00 +6.395169E+00
    +2.478977E+00 +2.480961E+00
    #Bottom power supply:
    #channel 1 channel 2 channel 3 channel 4
    +6.098554E+00 +6.294981E+00 +6.293970E+00 +4.997409E+00
    +2.105648E+00 +2.484600E+00 +2.478818E+00 +5.471377E-01


  3. Look for currents (lines 4 and 8, numbers are close to 2.4) that are about 0.03A low like the example at the bottom of this page. If currents all look OK, then the CRT probably doesn't need to be power cycled.

Powering Cycling Remotely

  1. powerCycleCRT.sh
  2. If you look at the CRT currents now, they probably look a little low like:

    #Top power supply:
    #channel 1 channel 2
    +6.396924E+00 +6.395017E+00
    +2.440086E+00 +2.455503E+00
    #Bottom power supply:
    #channel 1 channel 2 channel 3 channel 4
    +6.098396E+00 +6.294999E+00 +6.294201E+00 +4.997637E+00
    +2.095636E+00 +2.452152E+00 +2.437212E+00 +5.403075E-01

  3. You have to run the CRT to turn on some components:

    #This will send triggers to the CTB briefly, so communicate with anyone using Run Control before going on.
    #Make sure no one is running the CRT through run control, then:
    startallboards.pl gainupdate_v9 #If this step hangs, interrupt the command and tell the CrtExperts what happened.
    stopallboards.pl gainupdate_v9
    pollAllCRTLV.sh

  4. Now, you should see something like:

    #Top power supply:
    #channel 1 channel 2
    +6.397623E+00 +6.395380E+00
    +2.483096E+00 +2.483986E+00
    #Bottom power supply:
    #channel 1 channel 2 channel 3 channel 4
    +6.099715E+00 +6.295719E+00 +6.293567E+00 +4.997525E+00
    +2.100666E+00 +2.486437E+00 +2.476722E+00 +5.449448E-01

    If you don't see any low currents, then you've fixed the problem!

  5. If you are still getting low currents in step 4, then going back to step 1 only once might help. If you get here a second time, stop and get help from the CrtExperts. I've seen the CRT need a "double power cycle" a few times before, but power cycling more than 2 times might be hiding a bigger problem that could damage the CRT hardware.

With Expert Advice Only: Steps to Power Cycling the CRT at the rack (EHN1)

First make sure you can see the screens from both CRT-001 and CRT-002.

1) Use the arrows to move to Channel 1 on NP04-PS-CRT-02. You can tell which channel you are on by the number being darkened within the square on the screen.

2) Find the On/Off button and turn off Channel 1

3) Turn off Channel 2 then turn off Channel 3

5) Move up to the top module NP04-PS-CRT-01

6) Turn off Channel 1, then turn off Channel 2

7) Move back to the bottom module, NP04-PS-CRT-02 and turn off channel 4

8) Wait two minutes

9) Now on NP04-PS-CRT-02, turn on Channel 1 followed by Channel 2 then Channel 3

10) Move to NP04-PS-CRT-02 and turn on Channel 1 and Channel 2

11) Go back to the bottom module, NP04-PS-CRT-02 and turn on Channel 4

12) Check and make sure the voltages and currents look good

Sometimes the current draw is a little lower than usual (-0.03A) when turning off/on the LV. We suggest that you try starting another run and then check back on the current once again.

For now, contact the CrtExperts

Example of a Problem

<br />[np04daq@np04-crt-001 ~]$ pollAllCRTLV.sh <br />#Top power supply:
#channel 1 channel 2
+6.396826E+00 +6.395128E+00
+2.454188E+00 +2.480973E+00
#Bottom power supply:
#channel 1 channel 2 channel 3 channel 4
+6.098924E+00 +6.294955E+00 +6.293804E+00 +4.997423E+00
+2.097286E+00 +2.486562E+00 +2.478801E+00 +5.433664E-01

Top power supply channel 1 has a current lower than the other boards' power supplies by about 0.03A. The whole system needs to be power cycled because the "readout boards" (that convert CAT6 to USB) and the clock fanout can go into a "bad state" if they see one of the boards powered off.

-- Main.anolivie - 2018-11-02

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Topic revision: r5 - 2019-03-15 - AndrewPaulOlivier
 
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