958-31
REV.
B
l
'8
UQDIII!4IL-0-!!-
FROM
THERMOCOUPLE
INPUT T0 BRIDcE
TMNSDUCER
INPUT
(continued)
10.
REMOVE
the
Cold
Junctlon
Compensating
Reslstor
assembly from the rear
terrninals
of
the
controller
case
(terrninals
F & G) for older
controllers or
remove
the compensatln8
resistor
(CJCI)
and its
support_ from
the I/0 board
of
newer controllers.
I l.
Connect
t-he
flex
cable frorn
the CPU board to the accessory
board and
connect
the
flex
cable fron the
accessory board to the I/0 board.
12.
SHIP
a copy
of
supplementary instnrctjon 956-667
along
with
the st,andard
rnanual.
(A
copy
of this instruction
nay be found in Section
13.2.)
].9
MODIFICATION
FROM
THERMOCOUPLE
INPTIT TO ADD INPUT I.SOLATION
In most applications,
lnput isolation
js
not needed. Where
ground
loops in
multiple
controller
systems
appear
to
be
a
problern,
first
try to isolate
the output as
that
is
usually easier
to do.
(Note
that units with
SSR, DC trlgger or open
collector
outputs have
internal
optical
isolation as standard.
Instructions for
4l2O nA
isolated
output
are
given
in Section 4.3.6.) For
those applicatj.ons
where input
lsolat1on
i.s required
(where
renote setpotnt input
and/or
non-lsolated
analoB
outputs
are also
provlded),
a modifrcation for input lsolation
ls
available
as
a
built-to-order
special. 0RDER
THESE
UNITS
FROM
THE FACTORY.
].10
MODIFICATIONS
FOR I35O
SLIDEWIRE
(MODEI,S
2OI4 &
2015 ONLY)
A
mod-tfication
js
required
when the feedback slidewire resistance
is other
than the
standard
10000. This
modification is for use with
a
ll50
slidewire only.
Renrove the
I/0 board
from the electronic
assembly
per
instructions
in
Sect ion 1.10
and make
the followlng changes:
l. Replace resistor Rl
on
the
small
adder board
wrth 825f1-1%
(1849-8250)
2. Recheck
the controll.er operation
at the low supply voltage
conditrot.t
wtth a
ll50
dunrmv resistor across terrnin;r1s A and
C.
3. r l MoprFrc4TI_0x!_!!3_!!00
_s!M{!Bq_(MOIELS
2ql4
& 20ls oNr,Y)
This rnodrfrcation
converts a Model 2O14
or 2015 fltted for a
standard
10000 slldewire
for
use
with
a non-standard i00fl slldewire.
Renove the
I/O board frorn t-he electronic
assembly
per
instructlons
rn Sectron
1.10
and make t he
f
o
1l or,ving changes :
l. Replace resistor
Rl7 on
the I/o
board with 24.9k-17"
(7849-2492)
2. Recheck the
control
ler operatron
at low supply
voltage
condrtions
wrth a
1000 dummy resistor across terrninals
A and C.
LFE Instruments
Division
-3
4-
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