PXI and FESA reboot instructions

FESA Reboot

If the FESA has stopped and doesn't come back by itself (diagnosis: heart beat in the DCS has stopped), try to reboot it with one of these alternative methods:

1. Via DCS, logged in with the role totem-dcs-experts, through the menu "Reset Motor" (top right on the main RP panel), then "FESA": first "off" button, then after a few seconds "on" button. Wait several minutes to let the system come back up. When the heart beat restarts, FESA is back.
2. Call the CCC. They can reboot the FESA with their "diamon" tool. Our server is the only one carrying "totem" in the name.
3. In case of a FESA hardware failure, go to USC55 and physically switch over to the redundant spare: Exchange of FESA front-end computer during TOTEM data taking
4. If all else fails, call the FESA expert: Borja Fernandez Adiego (16 0736).

Note that FESA reboots can be performed with beam in the machine. There is no dump risk.

Reset of Motor or LVDT PXI

A reset is needed in 2 cases:

1. The heart beat stops (you may have received a warning SMS or email).
2. The CCC complains that sending new limits to the XRP system fails either with error message OR SILENTLY ! In the latter case, the symptom is that the pots refuse to move to physics positions (because the limits stayed tight around garage).

Always start by rebooting only the motor PXI; only if this doesn't cure the problem, reboot also the LVDT PXI.

Rebooting the motor PXI with beam in the machine has been tested to be safe. Rebooting the LVDT PXI will dump the beam.

Under normal circumstances reboots should only be performed via DCS:

• Login with role "totem-dcs-experts"
• menu "Reset Motor" (top right on the main RP panel)
• under "Motor PXI" or "LVDT PXI": first "off" button, then after 5 seconds: "on".
• wait several minutes to let the system come back. When the heart beat counts and the table of positions and settings shows meaningful values, the system is operational. If the heart beat is counting but the table shows 0 (zero) everwhere, even after waiting some minutes, repeat the reboot.
• After a successful reboot, the PXI processes start automatically.

Note that the buttons "Motor PXI" and "LVDT PXI" are deactivated when there is beam in the machine. In principle, it is safe to reboot the motor PXI with beam in the machine. If you know the bypass trick (i.e. you are confirmed enough), you can use it. Otherwise wait for the end of the fill.

In case of problems, call

• Sylvain Ravat (16 3402): software issues,
• Xavier Pons (16 4723): hardware issues.

If all else fails and the XRP system blocks the machine, turn the bypass key: LVDT Bypass Box: use cases and instructions