Section A - problems in going from OFF to STANDBY

• If the system is still initialising after reload of the program the double height message at the top of the CTD HV screen will read
  

  CTD HV SYSTEM INITIALISING
  

  In this state no keyboard commands will be acknowledged. Just wait for 3 or 4 minutes until the initialisation is finished. If the initialisation is not finished after that time, perhaps part of the system has hung - see section D.
• It normally takes about one minute to go from OFF to STANDBY. While this is happening the double height line at the top of the CTD HV screen will read
  

  CTD HV SWITCHING ON TO STANDBY
  

  This is O.K.
• perhaps there are TRIPS? If the double height message at the top of the CTD HV screen reads
  

  ALL CHANNELS OFF (SOME TRIPS)
  

  then some of the sections of the CTD HV have tripped. To clear these trips type
  

  clear

  on the keyboard. After a few seconds the double height message should change to
  

  OFF (! BUT NO DATA TAKING VETO !)
  

  or
  

  CTD HV OFF (ALL CHANNELS OFF): O.K.
  

  If this fails to happen in 10 seconds, try
  

  clear

  again; if it still fails see section C.
• If there are no TRIPS and the system is in an OFF state, perhaps there are ALARMS?

  Alarms are reported on the CTD HV screen in the line immediately below the double height top line, as white letters on a black background. Any alarm except
  CALS OPEN/DATA TAKING SWITCH OFF
  will prevent the change from OFF to STANDBY. Possible alarms which will stop the change from OFF to STANDBY are:
  

  RED_BUTTON -
  the emergency off button has been pushed in. To release it go to the rucksack level A. Between rack A2,06 and A2,07 (just above head height) is a red button. Twist it slightly anticlockwise and it should release, and the RED_BUTTON alarm should disappear.
  

  TRIPS -
  some part of the ctd hv system has tripped. If the message persists after clearing trips see section C.
  

  UPS_POWER -
  alarm means that the AC mains power supply has failed. The CTD HV program will soon exit automatically.
  Solution - fix the reason for the loss of power and reboot/reload the program as in section D. The CTD HV system power is taken from the supplies to racks A1,07, A2,06 and A2,14. Make sure that the power buttons for these racks in the corner of the rucksack are ON.
  Make sure the "HAGER" switches at the top of racks A1,07, A2,06 and A2,14 are ON (=UP).
  Make sure the 3.15 amp "slowblow" fuse on the back of the UPS crates at the tops of racks A1,07, A1,11, A2,10 and A2,14 and near the top of rack A2,06 are O.K. Spare fuses are taped to the back of the crates. Also make sure that the VME crate at about shoulder level in A2,06 has power and the OS9 computer in this is running. (This has overall control of the AC mains power distribution to the CTD HV). If this computer is not running see section D.
  

• Perhaps the OS9 computer in the ctd hv crate in rack A2,06 has hung (see section D).