OT LV Distribution

Power Supply


The low-voltage bias to Front-End Electronics and to the Control Box is supplied by the Wiener MARATON (MAgnetism and RAdiation TOlerant New) low voltage power supply system, schematically illustrated in the figure below .

Maraton Overview

The system consists of the following components: For the OT, 6 (six) Maraton Power Boxes are used, located in the LHCb cavern under the bunker, 3 in racks XXX (A side) and 3 in rack XXX (C side).

Marathon Backplane Marathon Frontpanel

Each Power Box supplies one half-station, i.e. two C-Frames: Cables are connected at the back of the Power Boxes through a Power Bin by means of crimping terminals.

LV Cables

The 6 Power Boxes are supplied 385V by 6 PFCs, located in a Primary Rectifier Bin in rack XXX in YYY.

PFCs

The 6 Power Boxes are controlled by 12 RCMs, located in a 6U VME crate in rack XXX in YYY (on top of the Primary Rectifier Bin). In practice, each RCM has its own IP address and controls the 6 LV outputs corresponding to one C-Frame:

RCM Hostname
RCM IP Address
C-Frame 1
C-Frame 2
otmatn01 10.130.20.101
T1-Q02-XU
T1-Q02-VX
otmatn02 10.130.20.102
T2-Q02-XU
T2-Q02-VX
otmatn03 10.130.20.103
T3-Q02-XU
T3-Q02-VX
otmatn04 10.130.20.104
T1-Q13-XU
T1-Q13-VX
otmatn05 10.130.20.105
T2-Q13-XU
T2-Q13-VX
otmatn06 10.130.20.106
T3-Q13-XU
T3-Q13-VX

 
Control Boards

An overview of the OT LV rack in YYY can be found in the picture below .

Control Rack