Kontron VMOD-2D Manual de usuario descargar pdf (Pagina 64)

VMOD-2/VMOD-2D

12/15/97

Installation

Page 4 - 4Man. ID 03139, Rev. Index 0200

Figure 4-1:Location of jumpers on a VBP or VBP2 VMEbus backplane

4.4 Connecting the External Devices

If you are using any external leads which carry any voltage, do not plug the external leads into

the front panel connector until after the VMOD-2/Piggyback(s) assembly has been installed in

to the rack. The reasons are as follows;

1/. For any external voltages (either under or over 50 Vdc) a risk of electrical shorts exist if

the assembled VMOD-2 is laid onto any conductive surfaces, including anti-static work-

bench mats, etc.

2/. If your external power units are not protected by fuses (in all lines) there is a risk of lines

being accidently shorted when the modules are pushed in/or pulled out of the rack. In

particular their is a chance that lines from different external equipments can be shorted

together or to the VMEbus system's frame ground if the solder side of the VMOD-2's

BU2a and/or BU2b pins and/or the solder side of the piggyback ST2 or ST3 pins touch

the front panel of the module already fitted in the adjacent slot.

3/. If the external voltages exceed 50 Vdc, personnel are exposed to risk of electrical shock

from solder side of the piggyback and the VMOD-2, i.e. from solder pads under the

VMOD-2 50-pin connector.

We also recommend that where possible no external power be present on the external con-

nector when making/breaking the connection, as this can degrade the connectors life.

BG3*

IACK*

Termination network

resistor pull-up packs

Jumpers set for empty

slots or wherever

PepCards without any

Daisy chain handling

ability are fitted.

SLOT #1

VM20 Processor Board

as system controller

remove BG3* and

IACK* Jumpers

SLOT #1

SLOT #n

Where VMOD-2 is to

be fitted, always

remove the IACK*

Jumper

VMOD-2

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 81 82

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Kontron VMOD-2D Manual de usuario Pagina 64

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