Publication No. GBX24-0HH/2
Installation and Power Up 19
4 •
Installation and Power Up
Review
the
section
before
installing
the
board.
The
following
notices
also
apply:
CAUTION
Consult the enclosure documentation to ensure that the board’s power requirements are compatible
with those supplied by the backplane.
The
GBX24
may
require
up
to
9
A
from
a
5
V
power
supply
within
VMEbus
Specification
limits
(+5
V
+5
%
‐
2.5
%).
The
±
12
V
supply
lines
(VMEbus
±
12
V
+5
%
‐
2.5
%)
are
not
used.
CAUTION
Do not operate the GBX24 on an extender card. The GBX24 paddle card uses differential pair
impedance matched tracking that is not found on typical extender cards.
4.1 Board Installation Notes
1.
Air
‐
cooled
versions
of
the
GBX24
have
an
injector/ejector
handle
to
ensure
that
the
backplane
connectors
mate
properly
with
the
backplane.
The
captive
screws
at
the
top
and
bottom
of
the
front
panel
allow
the
board
to
be
tightly
secured
in
position,
which
provides
continuity
with
the
chassis
ground
of
the
system
and
prevents
inadvertently
disconnection.
2.
Conduction
‐
cooled
versions
of
the
GBX24
have
screw
‐
driven
wedgelocks
at
the
top
and
bottom
of
the
board
to
provide
the
necessary
mechanical/thermal
interface.
Correct
adjustment
requires
a
calibrated
torque
wrench
with
a
hexagonal
head
of
size
3
/
32
”
(2.38
mm),
set
to
between
0.6
and
0.8
Nm.
3.
In
an
air
‐
cooled
development
enclosure,
when
taking
I/O
connections
from
the
backplane
connectors,
use
of
GEIP
I/O
modules
(or
some
equivalent
system)
ensures
optimum
operation
with
regard
to
EMI.
