Electronic Systems Support

CAN Branch PSU

Designed: Bjorn HalgrenPH-ESS Responsible: Paul Harwood

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What is it? A 6U crate, containing

Power supply modules (up to 8) CAN patch modules (up to 4) Control & monitoring (ELMB)

Capacity Maximum of 16 isolated branches Each branch powering up to 32 CAN

devices (depending on load)

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What does it do for you? Provides the required CAN supply voltages

Provides a convenient method of ‘patching’ the CAN bus into the cabling to the remote devices

Connects directly to a Kvaser interface

Provides; via a CAN interface (DCS) Monitoring (current, voltage) of each CAN bus

branch. ON/OFF control of each branch.

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Crate Details 6U x 160mm Contains ELMB for monitoring &

control

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Power Supply Module 2 CAN branches

Each branch electrically isolated

12V, 2A CAN bus supply

12V, 3A Digital + Analogue supply

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Patch Module 4 CAN branches

Fitted to rear of crate, patches power & CAN bus together

Takes 4 CAN inputs, or 1 25way connector from Kvaser interface

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Current Status Current activities

Electrical, Thermal & Operational testing about to commence

Building of 5 pre-production units to satisfy immediate requirements

5 crates, 20 PSU modules, 10 patch modules

This gives 5 half populated crates (8 branches), or an alternate combination

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What will it cost? Costs are currently only estimates Final unit costs will depend on

production quantities and the final production contractor

Estimates shown below should be close, but could vary in either direction

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Current Actions Fix quantities required

ALICE: ? ATLAS: 40-50 CMS: ? LHCb: 3-6

Search for a suitable contractor to build and supply the production units (price enquiry)

Complete the testing, including EMC, environmental etc.

Review production aspects of the design, to improve cost, safety, reliability etc.

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Future Support PH-ESS will

Procure Against advance payments

As for VME crates, TTC equipment, VMEbus SBCs

Test Provide second-line support

Repair First-line support (spares) with

experiments