VXS Backplane 23001 – 701
User Manual
Assembly Instructions & general Information
1.
Warning:
Only important if V1 and V2 are used
If the +V1 and +V2 voltage rails are tied to ground and the +12V power is used, the nominal voltage
between the +12V and the -V1 and -V2 power rails is 60 volts. With voltage tolerances, the 60 volt
maximum is exceeded. Additional protection might be needed to comply with local and national regulatory
agencies.
2.
Mechanical Mounting:
Attach the backplane through the mounting holes in at least every second
connector position at top and bottom using M2,5 screws and isolating washers.
3.
Chassis GND:
If noise reduction shall be achieved by connecting digital GND to Chassis GND, use
conductive washers instead of isolating ones. Spring washers are recommended instead of flat washers.
Creepage and clearance between screw and GND are in accordance with EN60950 is maintained by
layout when using isolating washers.
4.
Live Insertion:
Schroff VME64x backplanes fulfil the requirements of the VME Live Insertion standard
VITA 1.4. The LI/I* (Live Insertion IN) is an active low input signal to a VME64x LI board that acts to
enable/disable the on-board power control logic. A set of two pins per slot for LI/I* and GND spaced by
100mil is optional available to use micro-connectors to connect the signal to a radial power control module.
5.
Daisy Chain:
Schroff VME64x Backplanes are equipped with Electronic Automatic Daisy Chain.
OR gate
truth table
A B Y
1 1 1
1 0 1
0 1 1
0 0 0
Slot 1
Slot 2
Slot 3
Slot 4
Electric Automatic Daisy Chain
BUS GRANT and IACK
A20
A21
R: 82k
active LOW signal
propagating starts
from System
controller
Grant signal propagates as a "baton" from board to board. Board which has
requested the bus, stops propagating of the grant signal.
If a board is removed, the broken chain must be closed.
IN
OUT
loop from IN to OUT must be closed if board is not inserted
R: 82k
6.
Dimensions
Height 262.05 mm, Width 171,72mm
7.
Assembling of Power Cables:
If an open frame power supply is used instead of pluggable PSU´s, please
pay attention by connection the power cables to the power bugs. M4 cable lugs should be used to connect
the cables from the PSU to the powerbugs on the backplane. Maximum 2 cables are allowed per
powerbug. Please assemble the cable lugs with the flat side to the power bug to ensure the correct
isolation distance between unisolated part of the power cable and unisolated parts of the backplane.
Powerbug
Cable
Correct orientation
Powerbug
Cable
Wrong orientation
Schroff GmbH, Febr. 2006; Document#: 73972-125, Rev.: 51
www.schroff.de
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