LFE 2000 Series - Page 77

LFE 2000 Series

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958-31

REV.

B

7.2.6

OPEN

COLLECTOR

OUTPUT

TEST

Connect

the

open

collector

OUTPUT

I

andlor

OUTPUT

2

as

shown

in

the

circuit

below:

Press

the

DISpLAy

key

untii

0UTl

X%

or

OUT2

MAN

lndicator

is

flashing,

press

the

untrl

the

MAN

indicator

is

illuminated.

on

the

display.

If

the

Press

the

AUTO/MANUAL

kev

X%

is

indicated

START/STOP

key.

Using

the

criteria

of

7

.2,4,1

(ON/OFF)

or

7

,2.4.2

output

which

will

switch

the

external

clrcuit.

7,2.7

RETRANSMiTTING

OUTPUT

TEST

(SETPOINT

OR

pV)

l.

2,

7.2.8

l.

z.

1

(TPR)

test

the

open

collector

Connect

a

suitable

callbration

source

to the

controller

input

terminals.

connect

a

l000fl

1/2w

l%

resistor

across

output

terminals

D

and

E for

a

4120

nA

output.

Most

voltage

output

loads

are

high

impedance.

It

is

therefore

normal

to calj-brate

the

voltage

output

without

a

load.

When

it 1s

known

that

the

load

ts

not

a hrgh

impedance,

that

specrfic

load

resistance

(minimum

of

l000fl

for

0_

5V

or

a

minirnurn

of

20000

for 0-l0V)

should

be connected

across

termrnals

D and

E.

connect

a

dieltal

voltmeter

across

terminals

D(+)

and

E(-).

Vary

the

input

calibratiorr

source

and

observe

the

drgltal

voltmeter.

The

digjtal

voltmeter

should

change

reading

corresponding

to the

lnput

change;

linearly

reaching

the

mini-mum

and

maximum

output

values

at the

correspondlrrg

limits

of

the spau.

For

4-20

mA

and

0-5 v

outputs,

pot

Rl00

may be

used

to

calrbrate

the frrll

scale

output.

The 0-10

V

output

is

not

adjustable.

(Note

that

for

both

thermocouple

and

RTD

rantes,

the

output

shoulcl

be linearrzed

wrthin

the

accuracy

limjts

llsted

in the

specificatlons

(see

Sectron

t.l.2)

and

the

converter

output

resolution

of

I

part

1n

256.)

AIARM/TIMER

RELAY

OUTPUT

TESTS

Corrnect

a

continuity

tester

across

the

alarm/timer

relay

terminals

to be

tested.

Enter

the

TUNE

L0oP

and

determine

the

settj.ng

of

the

alarmltimer

relay

to be

tested.

For

an

alarm

relay,

connect

a suitable

calibration

source

to

the

input

terminals

and vary

the

input

around

the

setpornt

value

determined

in

step

2. The

alarm

relay

should

actuate

and

deactuate

accordingly.

The

difference

between

actuatiorr

and

deactuation

is the

relay

beadband.

LFE Instruments

Division

-

70-