TMA OSS Fails to Turn On#

Overview#

This procedure describes how to recover the OSS system when it fails to turn ON.

Error diagnosis#

  • Chiller(s) light in the EUI OSS screen is red. OSS, observation and cooling lights are red too. On the alarm banner on the bottom, you can read LOCAL: COOLING SYSTEM.

    ../../../../_images/OSS_general_view.png

    OSS general view#

  • The Alarm History screen shows

    ../../../../_images/Alarm_History.png

    Alarm History#

in more detail:

../../../../_images/alarm_his_1.png

Alarm History Detail#

../../../../_images/alarm_his_2.png

Alarm History Detail#

Procedure Steps#

  1. Go to Level 1 Machinery Room and bring with you a Philips screwdriver. The Machinery Room is the left door in the picture below.

    ../../../../_images/level-1.png

    Level 1#

  2. The screens in the front panel of one or both of the chiller cabinets display an alarm. On the top, the red band says: “STATUS: NOT ACKNOWLEDGED” or “STATUS: ALARM”.

    ../../../../_images/chiller_2.jpeg

    Chiller #2#

    ../../../../_images/alarm_menu.jpeg

    Front panel of Chiller displaying alarms.#

    The large grey box on the cabinet’s side (purple arrow) shows a blinking red light and an interlock in the screen.

    ../../../../_images/grey_box_cabinets.jpeg

    Grey Box on the cabinet’s side#

    ../../../../_images/interlock_screens.jpeg

    Interlock Screen#

  3. There are two reset buttons inside the chiller cabinet that need to be pressed. From the side of the cabinet, use the screwdriver to remove two screws that are located on top. This will allow you to remove the cover panel. Each cabinet has two panels.

    Chiller #2 has the reset buttons within the furthermost panel (Image below), while in chiller #1 they are found under the panel closer to the front face of the chiller.

    ../../../../_images/furthermost_panel.jpeg

    Remove this panel#

    ../../../../_images/Hand.jpeg

    Unscrew#

  4. Press each of the red reset buttons inside the cabinet for 3 seconds: Order does not matter.

    ../../../../_images/reset_button_1.jpeg

    Reset buttons inside chiller cabinet.#

  5. Press the reset button on the large grey box on the side of the cabinet. The red alarm light should stop blinking.

    ../../../../_images/reset_button_2.jpeg

    Reset alarm in the grey box.#

  6. Acknowledge the alarms in the front panel by pressing the tick mark on the bottom of the screen. After perhaps a minute or two, the front screen should show “STATUS:OK”.

    ../../../../_images/acknowledge_alarm.jpeg

    Alarm acknowledgment in the front panel.#

  7. Repeat steps 2-6 with the other chiller, if it shows an alarm.

  8. Back to the control room, reset the alarm in the TMA EUI Safety System screen. Click on the red OSS malfunction and press the blue RESET SELECTED button. The red color should disappear.

    ../../../../_images/safety_system.png

    Reset OSS malfunction alarm in TMA EUI Safety System screen.#

Post-Condition#

  • The OSS should be now ready to turn ON successfully.

Contingency#

If the procedure was not successful, report the issue in channel #summit-simonyi and/or activate the Out of hours support.