This is the LV and HV power distribution crate. The units are mostly passive patch-panel type units. The LV units (4 per motherboard)) have 2 control lines each for turning power off. The crate gets power from the LV power sullply crate (see below). Cables up to the MVD are described in the signals document.

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ps version


This is the LV power supply crate, a 6U VME crate.. Each double-wide unit can hold 6 supplies. Each of the 4 motherboards need +5 analog, -5 analog and +5 digital, to be conditioned and passed on to the MCM's. In addition, the MB's need their own +5 power to function. This is shared with the power delivered to the 6U VME ancillary crates.

'9U' refers to the interface module 9U VME crate, '6U' refers to the two ancillary 6u VME crates.

There is one control line per MB, to switch off all power except for the +5 needed to keep the MB itself alive. This is never switched off.

PDF of type AB, type CD, type E, type U.


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This is how the power maps from the supplies to the distribution modules and then up to the MVD.

The drawing is for 1 motherboard only, so this scheme is repeated 4 times. Each double-wide power supply unit can hold 6 'bricks'. Each distribution unit needs 3 voltages (+5a,-5a,+5d). For Mother Board 1, the analog +-5 comes from the top half of the first module, and the +5 digital comes from a brick in the 3rd module.
A single control line can switch the supplies for MB1.

The bottom half of module 1 and 3 service MB2, and this is repeated for MB3 and 4 on modules 2 and 4. Each distribution unit splits this power over 2 14-pin ribbons going up to the MVD. Each motherboard needs only 7 ribbons (6 power-comm + 1 daughter board). The 8th 14-pin ribbon will power the motherboard itself (this requires som modifications on the 4th distribution board).

The remaining bricks on supply modules 3 and 4 provide +5 for the interface module crate.

There is one control line for each of the 14-pin ribbons on the distribution units. Switching off one ribbon corresponds to one power-comm board in the MVD, which holds 6 MCMs.

These are the specs for the 14-pin ribbon

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Above is a side view of the ../rack where the ancillary-, interface-, LV- and HV crates are housed. (ps version)
Below are the front and back views. (ps version, ps version)

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Last update 10 Dev 2000 - HvH