Operational Readiness Clearance Documentation

# D0 L1 Calorimeter Upgrade Test Stand

**D0 L1 Calorimeter Group**

**Addendum to August 16, 2005 pORC**

**November 16, 2005**

System Contact

Linda Bagby

DAB X3100

<bagby@fnal.gov>

## Introduction

Unattended operational readiness clearance was granted for the Level 1
Calorimeter Trigger upgrade project in August, 2005. This document is an
addendum to the original pORC documentation. The D0 RunIIb L1
Calorimeter Trigger Upgrade system has been built on the sidewalk area
of the D0 assembly building. The system consists of 3 types of crates,
namely, the ADF (Analog Digital Filter) crate, TAB/GAB (Trigger
Algorithm Board/Global Algorithm Board) crate, and a Control crate.
During the August review two of the crates, Control and TAB/GAB, were
powered by bench top supplies. The production supplies and crates have
now been installed. Two additional ADF crates have also been installed.
We seek operational readiness clearance for unattended operation of the
final production system.

## Rack Layout

The rack layout for this system is provided in drawing number
3823.133-ME-434359 (L1_Cal Trig Rack Layout Mod. Sidewalk Dwg/W New
Crates) at

<http://d0server1.fnal.gov/users/fogie/Jim/434359--1.pdf> This review
focuses on the crates and power supplies, indicated in red, in Figure 1.
S107 contains the TAB/GAB crate, S108 contains the Control crate, and
S109/S111 contains two additional ADF crates.

![](media/image1.wmf){width="5.795138888888889in" height="4.19375in"}

Figure 1: L1_Cal Sidewalk Rack Configuration for Operations

**AC Distribution -- Smoke Detection**

Figure 2 illustrates the AC distribution and smoke detection system in
the additional ADF rack as well as the TAB/GAB and Control crate racks.
Three 120V/30A services are available to power two two-rack banks,
S105-S106, S107-S108, and S109/S111. Each service is split into two 15A
services via the AC Distribution box. Two Switched Power Boxes provide
the smoke detection interlock, via a D0 standard RMI (Rack Monitor
Interface) for each of the 15A services. The Fault Out output from the
RMI disables the DC power supplies within a rack while the Blower output
disables the fans.

![](media/image2.wmf)

Figure 2: AC Distribution and Smoke Detection System

## DC Distribution

The DC distributions under review are for four crates; two ADF crates,
one Control crate, and one TAB/GAB crate. The ADF crate power
distribution is the same as that reviewed in August. The Control crate
power distribution is similar to that of the ADF. The TAB/GAB crate uses
a similar power supply but a non-standard backplane.

### ADF Crate

The ADF power scheme utilizes a commercially available Wiener power
supply-crate combination unit. The document describing this system can
be found at

<http://www.pa.msu.edu/hep/d0/ftp/run2b/l1cal/hardware/adf_2/cards_and_crates/safety_review_adf_crates.txt>

This document describes the final configuration on the first floor of
the movable counting house in the D0 Assembly Building. The sidewalk
test stand configuration has been modified from the final installation.
Rather than one ADF crate mounted in a single rack, the last two ADF
crates required by the system are mounted in a single rack named
S109/S111. Cooling is provided by Wiener module fans as well as external
fan packs.

### TAB/GAB Crate

The TAB/GAB crate is powered by a Wiener type UEP6021 supply with two
modules. Module U0 is capable of providing 2-7V at 115A but will operate
at 6V with an expected current draw of 12A. Module U2 is capable of
providing 30-60V at 27A and will operate at 48V with an expected 5.5A
current draw. Figure 3 illustrates the DC distribution between the power
supply and the TAB/GAB crate backplane.

![](media/image3.wmf)

Figure 3: DC distribution for TAB/GAB crate.

The TAB/GAB crate power supply to backplane connection parameters are
shown in Table 1. The U0 module is connected to the 15A current limiting
fuse via a 1/0 cable capable of accommodating 150 A. From the 15A fuse,
a 10 AWG wire, capable of accommodating 35A, is terminated with a ring
lug and bolted in position over a .0924 in^2^ copper surface area
resulting in a current density of 159.2 A/in^2^. A 15 amp current was
used in the calculation since the external fuse is rated at 15A. The U2
module connection is made similarly with a current density of 106.1
A/in^2^. Both of these connections comply with the 1000A/in^2^ limit per
the Fermilab Electrical Standards guideline.

Table 1: DC Power Distribution to TAB/GAB backplane.

![](media/image4.wmf)

The current ratings on the press fit pins interfacing the backplane to
the TAB and GAB electronics boards also meet the guideline requirements.
The 6V current density is .56 A/pin while the 48V current density is .09
A/pin, well below the conservative 1A/pin reference. Figures 4 and 5
illustrate fusing values on the TAB and GAB electronics boards. All TAB
cards have 2A +6V fusing and the GAB has a 1A +6V fuse.

![](media/image5.wmf){width="4.184027777777778in"
height="2.2222222222222223in"}

Figure 4: TAB/GAB board fusing.

![](media/image6.wmf){width="4.500694444444444in"
height="3.963888888888889in"}

Figure 5: Backplane power distribution.

Control Crate

The Control Crate power distribution utilizes a commercial Wiener power
supply VME crate combination unit similar to the ADF crate previously
reviewed. This crate holds 2 Vertical Interconnect Master cards, an
existing design by Fermilab, a commercially available BIT3, the SCL/VME
card, and a SCLD (Serial Command Link version D). All of these cards
have been previously reviewed. A complete description of the system can
be found at

<http://www.pa.msu.edu/hep/d0/ftp/run2b/l1cal/hardware/adf_2/cards_and_crates/safety_review_control_crates.txt>

### 

### Cooling

The TAB/GAB, Control, and ADF crates each have a fan pack mounted below
the crate to provide cooling to the electronics. A fan pack module is
part of the Wiener power-crate combination unit.