Skip to content

MEG Power Shutdown / Restart

Problem

CHBH was informed by Estates of a whole building shutdown on Saturday 15th January 2022, for High Voltage maintenance. The shutdown was to last at least 6 hours.
A Measurement Window was set to start ~30min/60min before shutdown, to make sure liquefaction wasn't taking place.

Solution

After liasing with MEGIN, the shutdown/startup procedure was agreed as follows...


To shutdown beforehand, say ~30min before the agreed time...

  • Power down the Stim PC/s, Participant Logging Computer, EyeLink Host Computer (as necessary).
    Turn off the monitors.
    Power down the two UPS on the Control Room floor (make sure they don't restart!)    .
    • Press and hold the Power button for approximately 0.5 to 1 second. The unit should beep, indicating it is turning off. Front panel LED should go out.
    • Switch off the Mains at the wall socket.
  • May be prudent to power off above equipment the day before, to reduce workload on the day.
  • Set the Internal Helium Recycler (IHR) to Maintenance Mode using the Service GUI.
  • Close valve BV4 on the pressure regulator panel in the Internal Helium Recycler cabinet.
  • Open valve BV13 (Refill Bypass Valve - on the wall behind the MSR) to let any excess Helium exit outside via Helium exhaust pipe.
  • Make sure that the Main Power Switch on the cryocooler compressor is set to OFF (the cryocooler shouldn't be running, but stop liquefaction first if it is).
  • Turn off the Electronics cabinet components... in order (left to right).
    • 1st - Preamps.
    • 2nd - SQC Cards.
    • 3rd - Mains.
  • Turn off the IHR cabinet (press the UPS Power button for a few seconds).
    • Turn off the IHR Mains power (large red switch on the wall to the right of the cabinet).
  • Turn off any Stimulus cabinet devices, power off the bar plug.
  • Turn off the gantry lifting motor/traffic lights (Mains plug on the back wall, behind the MSR).
  • Shutdown the DACQ console & monitor.
  • Switch off the Watchguard Firewall and Network Switch, in the Side Room Comms cabinet.
  • Switch off the MSR lighting UPS...
    • Press the Power button on the front panel for 2 seconds, release at first beep.
    • Switch off the Mains at the wall socket.
  • Switch off the MSR Jun-Air air compressor (in the IHR Tank room, found behind the tanks).
  • Power down the two Eaton UPS located at the back of the IHR Tank room...
    • Press the Power button on the front panel for 3 seconds.
    • The UPS should start to beep and show a status of "UPS off pending...". The UPS then transfers to Standby mode, and the Mains indicator turns off.
    • Switch off the Mains for each UPS (Sockets on back wall, to the right of both UPS).

To startup, after confirmation that Mains power is fully restored...

  • Switch on the Mains sockets for the two Eaton UPS.
    • Both UPS front panel displays illuminate and show a status of "UPS initializing...".
    • ...both should then transfer to Standby mode ("UPS on standby").
  • Press the Power buttons on both front panels for at least 1 second.
    • The UPS front panel displays change status to "UPS starting...".
    • Confirm the Power On indicator are lit and showing solid green, indicating that both UPS are operating normally and any loads are powered (or will be once they are turned on).
    • The UPS should now be in Normal mode.
    • Press the ESC button until the start screen appears.
  • Switch on the MSR Jun-Air air compressor (in the IHR tank room, found behind the tanks).
  • Switch on the MSR lighting UPS...
    • Switch on the Mains socket.
    • Press the Power button on the front panel.
    • The green "On Line" indicator flashes.
    • The yellow "On Battery" indicator lights while the Self-test is being performed.
    • When Self-Test has successfully completed, only the green "On Line" indicator will be lit.
    • Check the MSR lights come on when the light switch is depressed.
  • Switch on the Watchguard Firewall and Network Switch, in the Side Room Comms cabinet.
  • Turn on the gantry lifting motor/traffic lights (Mains plug on the back wall, behind the MSR).
  • Turn on the Electronics cabinet components... in order (right to left).
    • 1st - Mains.
  • Power up the DACQ console and monitor, wait until login splash screen appears on the monitor.
    • 2nd - SQC Cards.
    • 3rd - preamps.
  • Run a RAP (Restart Acquisition Programs) on the DACQ.
  • Turn on the IHR Mains power (large red switch on the wall to the right of the cabinet).
  • Turn on the IHR cabinet (press the UPS Power button for a few seconds).
  • Turn on the Main Power Switch on the cryocooler compressor.
  • Turn on the bar plug in the Stimulus cabinet, power on any devices.
  • Open valve BV4 on the pressure regulator panel in the Internal Helium Recycler cabinet.
    • Wait for 1 minute.
  • Close valve BV13 (Refill Bypass Valve - on the wall behind the MSR).
  • Set the IHR to Normal Mode/Cooldown Mode (as necessary) using the Service GUI.
    • Check the correct LED combination is showing on the IHR cabinet door.
  • Turn on the two UPS on the Control Room floor; power on Stim PC, Participant Logging Computer, EyeLink Host Computer (as necessary).
  • Phew, Well done! Have a well-deserved cup of coffee!