
Insta
ll
at
i
on
2 1 1
1 4.7.1. 2 V ent
i
ng mode
l
s PL/X 1 8 5 - 2 6 5 us
i
ng back pane
l
aperture
Use the temp
l
ate prov
i
ded to ass
i
st
i
n cutt
i
ng the aperture
i
n the
back pane
l
Th
i
s
i
s the preferred method of mount
i
ng because
i
t a
ll
o w s the
max
i
mum amount of coo
l
a
i
r to f
l
o w over the heats
i
nk of the
dr
i
ve.
For
i
nsta
ll
at
i
ons requ
i
r
i
ng a 5 0 C
i
nterna
l
enc
l
osure amb
i
ent th
i
s
method
i
s necessary.
The source of c
l
ean, f
il
tered, coo
l
, dry a
i
r for vent
i
ng the un
i
t must
arr
i
ve at the bottom of the enc
l
osure. It must then be ab
l
e to f
l
o w
free
l
y to the rear of the backp
l
ate as sho w n. There must be no
obstruct
i
ons to the f
l
o w of a
i
r on
i
ts
j
ourney to the back aperture.
There
i
s a very po w erfu
l
fan
i
ntegra
l
to the PL/X w h
i
ch w
ill
suck
th
i
s a
i
r
i
nto the rear of the un
i
t. A fter pass
i
ng over the heats
i
nk
i
t
i
s exhausted at the top and bottom of the un
i
t. The exhaust a
i
r
must then be extracted from the enc
l
osure v
i
a roof mounted fans
capab
l
e of a throughput rate spec
i
f
i
ed
i
n the rat
i
ng tab
l
e. Note,
w hen ca
l
cu
l
at
i
ng the requ
i
red a
i
r throughput,
i
t
i
s necessary to
cons
i
der the d
i
ss
i
pat
i
on of a
ll
heat generat
i
ng components. The
d
i
ss
i
pat
i
on
i
n w atts for the PL/X , ma
i
n fuses and
li
ne reactors,
i
s
prov
i
ded
i
n the re
l
evant sect
i
ons.
1 4.7.1. 3 V ent
i
ng mode
l
s PL/X 1 8 5 - 2 6 5 us
i
ng standoff p
ill
ars
Th
i
s method of mount
i
ng may be the on
l
y pract
i
ca
l
techn
i
que
i
n
retrof
i
t
i
nsta
ll
at
i
ons w here cutt
i
ng an aperture
i
n the back pane
l
i
s
not poss
i
b
l
e.
The un
i
t
i
s prov
i
ded w
i
th a mount
i
ng k
i
t cons
i
st
i
ng of four 5 0mm
p
ill
ars. The max
i
mum enc
l
osure amb
i
ent temperature us
i
ng th
i
s
method
i
s 3 5 C. There must be no obstruct
i
ons to the f
l
o w of a
i
r
on
i
ts
j
ourney to the rear of the PL/X .
The reason for the reduced amb
i
ent rat
i
ng
i
s that some of the
exhaust a
i
r may be rec
i
rcu
l
ated over the heats
i
nk,
l
ead
i
ng to a
l
oss
of eff
i
c
i
ency. A ny steps that can be taken to m
i
n
i
m
i
se th
i
s are
advantageous. (The 3 5 C rat
i
ng app
li
es to
i
nsta
ll
at
i
ons w here there
i
s not comp
l
ete separat
i
on of the
i
ncom
i
ng a
i
r from the coo
li
ng
a
i
r).
If
i
t
i
s poss
i
b
l
e to prov
i
de an a
i
r duct w
i
th an aperture area of
greater than 1 8 0 sq. cm. that can transport a
i
r un
i
mpeded to the
rear of the PL/X , then th
i
s so
l
ut
i
on
i
s as effect
i
ve as the back
pane
l
aperture method descr
i
bed above.
A
i
rf
l
o w
Roof fans
Door mounted
a
i
r f
il
ter
i
ntake
A
i
rf
l
o w
A
i
rf
l
o w
B ack p
l
ate
1 0 0 mm m
i
n
ex tens
i
on
B ack p
l
ate
1 0 0 mm m
i
n
ex tens
i
on
m
i
n
i
mum gap 5 0 mm
A
i
rf
l
o w
Roof fans
Door mounted
a
i
r f
il
ter
i
ntake
A
i
rf
l
o w
A
i
rf
l
o w
Back p
l
ate
Dr
i
v e on 5 0 m m
standoff p
ill
ars
Summary of Contents for PLX
Page 2: ...2 Contents ...
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