LFE 2000 Series - Page 37

958-31
REV.
B
I
.
s
uqqI,{r
clu0l-IBqf
rHERMOcOupLE
rNpur
r0
DC
CURRENT
INPUT
Renrove
the
Input/0utput
(.Ilo)
board
frorn
the
electronlc
assembly
per
lnstructr-o. irr
Sect.ron
I
.
10
ancl
nake
the
f ol lowing
changes.
Refer
to
the
DC
CURRENT
INPUT
RANGE
RESISTOR
chart
(Table
3_ 2)
for
the v;rlues
selected
for
standard
ranges.
The
value
for
resistor
R2
is
calculatecl
to supply
arr
rrtput
slgnal
of
50
mV
using
the
followi'g
formula:
R2(shtrnt)
=
50mV
Irrput
Milliarnperes
;!;'r
['AUTION
;'r;,.
THE
MAXIMI]M
INPUT
CURRENT
SHALL
BE
LIMITED
To 5OO
'ADC
i.
2.
:1.
4.
REMOVE
resistors
R3,
R5
SHORT
.ll5
solder
bridge
(on
cornponent
side).
ALTF.RNATIVE:
on
older
pcB's,
ADD
a wire
jumper
from
the
feed
through
at
termrnal
G to
the
feed
through
at
terminal
F
(GND).
ADD
resistor
R2
(see
Table
l-2).
REMOVE
the
Colcl
.Jrtnct-i
on
L.lornpensatrng
Resjstor
assembly
fronr
the rear
termlnals
of the
controller
case
(termi.nals
F &
G)
for older
controllers
or
renove
the
compensating
resistor
(CJCl)
and
its
support
from the
I/O board
of
newer
controllers.
DC
CURRENT
FTII,t,
RANGE
I NPUT
(LFE
P/N)
5mA
20
mA
100
mA
lo0-]l7"
(
2
.5{l-17"
o,5Q-rz
1849-1
I
)
(1847
-259)
(
1847-5e
)
Tabl
e
3-2
NOTE:
Use
the
DC CURRENT
INPU]'
MNGE
RESISTORS
20
nA
ralige
resistor
for 4120
mA input
LFE
Instrunents
Drvision
-30
-