Compaq VAX 7000 Guide d'installation télécharger pdf (Page 10)

Figure 2: Laser Platform System Cabinet Layout

TF85 OCP C

or or or 48v

Reg

48v

Reg

48v

Reg

Power or or or

Distribution

A/C

I/P

Box

Laser System Bus Laser System Bus

Air Mover

XMI PIU Disk PIU Another PIU XMI PIU

XMI

Reg

Disk

Futurebus+

or (See note 1)

FRONT REAR

NOTE 1: XMI PIU needs full depth of cabinet for cable access

Power System

XMI

Storage

Power System

XMI

Reg

Disk

Air Mover

Disk

3.1.3 Power

Everything on the Laser Platform runs on 48v DC. The LSB modules have DC to DC con-

verters onboard which provide the required logic voltages. Each PIU has its own regulator(s)

which generate the required internal DC voltages from the 48v input. The one exception is

the battery PIU which uses 48v directly, as does the air mover.

The 48v is provided by up to three 240v AC to 48v Regulators (H7263). The cabinet requires

3 phase mains input, 1 phase supplying each regulator. A fully conﬁgured cabinet will run

with 2 regulators, thus 3 provides N + 1 redundancy. Most systems seem to come with just

1 regulator, which makes the platform a single phase load. This may mean moving the

regulators (and batteries, if ﬁtted) around to balance loads in multiple system installations.

See Advanced Troubleshooting Manual, appendix B, for how to calculate when a second

regulator is required. ("Base system" = 1 CPU, 1 Memory, 1 IOP, 1 XMI, 1 DEMNA and 1

regulator). See Section 3.3.6, Battery PIU for battery information.

Note that, as the cabinet does not have a traditional power controller, there are no switched

or unswitched 240v AC outlets. This means a separate socket has to be found for the console.

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