Lambda LJS-13A Series Manual de usuario

/A\

LAMBDA

ELECTRONICS-MELVILLE,

I.,

etre

LJS-13A

SERIES

This

manual

provides

instructions

intended

for

the

operation

Lambda

power

supplies,

and

not

reproduced

without

the

written

consent

Lambda

Electronics.

All

information

contained

herein

applies

all

LJS-13A

models

unless

otherwise

specified.

LAMBDA

ELECTRONICS

MELVILLE,

L.I.

N.Y.

MAIN

PLANT

TELEPHONE:

516

MYrtle

4-4200

IM-LJS-13A

BeaePl2oee

Performance

Checks

Adjustment

Calibration

Control

VR2

SERVICE

PARTS

ORDERING

IM-LJS-13A

ape

—

iviveie

GULATED

VOLTAGE

OUTPUT

Seeieciiation

LOTOS

TONS.

OAT

ION

AIYO

0.4%

line

load

with

input

variations

from

105-132

132-105

volts

and

load

variations

from

load

full

load.

Rippleand

Noise.

. .

.....

10mV

RMS,

50mV

peak-to-peak

for

LJS-13A-5-OV,

-6-OV

models;

15mV

RMS,

100mV

peak-to-peak

for

LJS-13A-12-OV,

-15-OV,

-20-OV,

-24-OV,

and

-28-OV

with

either

positive

negative

terminal

grounded.

Temperature

Sccincient

Change

output

voltage

0.03%/°C

max.

Remote

Programming

External

Resistor.

. .

. . .

. .

Nominal

1000

ohms/volt

output.

Programming

Voltage

. . .

. .

One-to-one

voltage

change.

Remote

Sensing

.......

Provision

made

for

remote

sensing

eliminate

effect

power

output

lead

resistance

regulation.

IM-LJS-13A

STORAGE

TIME

—

min.

full

rated

current,

maximum

rated

output

voltage,

and

105

VAC

input.

OVERSHOOT

—

overshoot

under

conditions

power

turn-on,

turn-off,

power

failure.

INPUT

ACInput.

..........

105-132

VAC

47-440

Hz.

Input

power:

Watts*.

For

operation

frequencies

above

440

Hz,

consult

factory.

*With

output

loaded

full

current

rating.

Input.

oes

eas.

VDC

S107

input

power)

teen

+With

output

loaded

full

current

rating.

INPUT

FUSE

—

Fuse

protects

the

input

wiring

the

power

supply.

Overload

power

supply

does

not

cause

fuse

failure.

OVERLOAD

PROTECTION

Electrical

External

...

. .

Automatic

electronic

current

limiting

circuit,

limits

output

current

preset

safe

value.

Automatic

current

limiting

protects

the

load

and

power

supply

when

external

overloads

and

direct

shorts

occur.

Internal

........

+...

Fuse

provides

prevention

against

internal

circuit

failure.

OVERVOLTAGE

PROTECTION

—

All

LJS-13A

models

include

fixed

built-in

overvoltage

protection

circuits

which

prevent

damage

the

load

caused

excessive

power

supply

output

voltage.

See

table

below

for

overvoltage

protector

firing

ranges.

OVERVOLTAGE

PROTECTOR

TRIP-POINT

RANGE

MODEL

(VOLTS)

INPUT

AND

OUTPUT

CONNECTIONS

—

Terminal

block

front

chassis.

Reed-Prince

no.

screw-

driver

required

for

terminal

screws.

OPERATING

AMBIENT

TEMPERATURE

RANGE

AND

DUTY

CYCLE

—

Continuous

duty

from

0°C

71°C

ambient

with

corresponding

load

current

ratings

for

all

modes

operation.

IM-LJS-13A

—_

weg

4-43

rm!

‘

She

cise

Pere

ABTS

Shee

oes

Vio

HSI4S

sui

iis

wai

Bee

Grr

vie

Ors

NON

MGrOS

Nn.

usin

‘ace

AASTS

hanerres:

;

”"

apmoficed

4fff

lanicee!

dvi")

LPeclem

wigs

Tawod

ol!

iweizad

aii

mca

Shar

SUS

ane

;

when

IM-LJS-13A

OPERATING

INSTRUCTIONS

‘

TORR

BASIC

MODE

OPERATION

This

power

supply

operates

constant

voltage

source

provided

the

load

current

does

not

exceed

the

rated

value

50°C.

For

continuous

operation,

load

current

must

not

exceed

the

rating

for

each

ambient

temperature.

When

rated

load

current

exceeded,

voltage

decreases

towards

zero

and

the

current

short

circuit

held

safe

value.

CONNECTIONS

FOR

OPERATION

NOTE:

Make

all

connections

the

unit

before

applying

input

power.

Ground

Connections.

The

Lambda

power

supply

can

operated

either

with

negative

positive

output

terminal

grounded.

Both

positive

and

negative

ground

connections

are

shown

the

diagrams

for

all

suggested

output

connections

illustrated

this

manual.

Connection

Terminals.

Make

all

connections

the

supply

the

terminal

block

the

front

the

supply.

Use

Reed-Prince

no.

screwdriver

terminal

screws.

Apply

input

power

input

terminals;

always

connect

the

ungrounded

lead

the

bottom

terminal.

The

supply

positive

terminal

brought

out

terminal

+V.

The

supply

negative

terminal

brought

out

terminal

-V.

Recommended

wiring

the

power

supply

the

load

and

selection

wiring

shown

figures

through

Selection

proper

wiring

made

the

basis

load

requirements.

Make

all

performance

checks

and

measurements

current

voltage

the

front

output

terminals.

Connect

meas-

uring

devices

directly

terminals

use

the

shortest

leads

possible.

SUPPLY

LOAD

CONNECTIONS

Connections

for

Operation

Constant

Voltage

Source

The

output

impedance

and

regulation

the

power

supply

the

load

may

change

when

using

the

supply

constant

voltage

source

and

connecting

leads

practical

length

are

used.

minimize

the

effect

the

output

leads

these

characteristics,

remote

sensing

used.

Recommended

types

supply

load

connections

with

local

remote

sensing

are

described

the

following

paragraphs.

Refer

figure

determine

voltage

drop

for

particular

cable

length,

wire

size

and

current

conditions.

Lead

lengths

must

measured

from

supply

terminals

load

terminals

shown

figure

Local

Sensing

Connection,

Figure

Local

sensing

the

connection

suitable

for

applications

with

relatively

constant

load

for

applications

with

short

power

output

leads.

Remote

Sensing

Connection,

Figure

Remote

sensing

provides

complete

compensation

for

the

voltage

drops

the

connecting

cables.

Sensing

leads

should

twisted

pair

minimize

pick-up.

2.5

elect.,

capacitor

may

required

between

output

terminals

and

sense

terminals

reduce

noise

pick-up.

Programmed

Voltage

Connections,

Using

External

Resistor,

Figure

Discrete

voltage

steps

can

pro-

grammed

with

resistance

voltage

divider

valued

nominal

1000

ohms/volt

change

and

shorting-type

switch

shown

figure

When

continuous

voltage

variations

are

required,

use

variable

resistor

with

the

same

1000

ohms/volt

ratio

place

the

resistive

voltage

divider

and

shorting-type

switch.

Use

low

temperature

coefficient

resistor

assure

most

stable

operation.

IM-LJS-13A

“3

o-oo

Before

programming,

adjust

programming

resistor

for

zero

resistance

and

set

voltage

adjust

control

the

minimum

rated

output

voltage.

Output

voltage

programmed

supply

will

nominally

minimum

output

voltage

plus

volt

per

1000

ohms.

shown

figure

voltages

can

programmed

utilizing

either

local

remote

sensing

connections,

desired.

Programmed

Voltage

Connections

Using

Programming

Voltage,

Figure

The

power

supply

voltage

output

can

programmed

with

externally

connected

programming

power

supply.

The

output

voltage

change

the

programmed

supply

will

maintain

one-to-one

ratio

with

the

voltage

the

programming

supply.

the

output

voltage

control

the

programmed

supply

set

minimum

output

voltage,

output

voltage

the

programmed

supply

will

minimum

output

voltage

plus

voltage

programming

supply.

The

programming

supply

must

have

reverse

current

capability

1.lma.

minimum.

Alternatively,

when

supplies

with

less

than

1.1ma.

reverse

current

capability

are

used,

resistor

capable

drawing

1.1ma.

the

minimum

programming

voltage

must

connected

across

the

output

terminals

the

programming

supply.

This

programming

supply

must

rated

handle

all

excess

resistor

current

the

maximum

programming

voltage.

Connections

For

Series

Operation,

Figure

The

voltage

capability

LJS-13A

power

supplies

can

extended

series

operation.

Figure

shows

the

connections

for

either

local

remote

sensing

series

connection

where

the

voltage

control

each

unit

functions

independently

control

the

output.

diode,

having

current

carrying

capability

equal

greater

than

the

maximum

current

rating

the

supply,

must

used

and

connected

shown

figure

The

diode

blocking

voltage

should

least

twice

the

maximum

rated

output

voltage

the

supply.

See

table

SPECIFICATIONS

AND

FEATURES,

for

power

supply

current

and

voltage

ratings.

OPERATION

AFTER

PROTECTIVE

DEVICE

SHUTDOWN

Fuse

Shutdown.

Fuse

will

blow

when

the

maximum

rated

current

value

for

the

fuse

exceeded.

Fatigue

failure

fuses

can

occur

when

mechanical

vibrations

from

the

installation

combine

with

thermally

induced

stresses

weaken

the

fuse

metal.

Many

fuse

failures

are

caused

temporary

condition

and

replacing

the

blown

fuse

will

make

the

fuse

protected

circuit

operative.

Overvoltage

Shutdown.

When

the

power

supply

output

voltage

increases

above

the

overvoltage

limit,

the

overvoltage

protection

circuit

will

short

circuit

output

the

supply

and

shut

down

inverter

operation.

After

eliminating

the

cause(s)

for

overvoltage,

resume

operation

the

supply

momentarily

interrupting

the

input

circuit.

IM-LJS-13A

MAINTENANCE

GENERAL

This

section

describes

trouble

analysis

routine,

calibration

and

test

procedures

that

are

useful

for

—

servicing

the

Lambda

power

supply.

trouble

chart

provided

aid

for

the

troubleshooter.

Refer

the

section

SPECIFICATIONS

AND

FEATURES

for

the

minimum

performance

standards.

TROUBLE

ANALYSIS

Whenever

trouble

occurs,

systematically

check

all

fuses,

primary

power

lines,

external

circuit

elements,

and

external

wiring

for

malfunction

before

troubleshooting

the

equipment.

Failures

and

malfunctions

often

can

traced

simple

causes

such

improper

jumpers

and

supply-load

connections

fuse

failure

due

metal

fatigue.

CHECKING

TRANSISTORS

AND

CAPACITORS

Check

transistors

with

in-circuit

transistor

checker.

checker

available,

transistors

can

checked

with

ohmmeter

that

has

highly

limited

current

capability.

Observe

proper

polarity

for

PNP

NPN

avoid

error

measurement.

The

forward

transistor

resistance

low

but

never

ZERO;

back-

ward

resistance

always

higher

than

the

forward

resistance.

not

assume

trouble

eliminated

when

only

one

part

replaced.

This

especially

true

when

one

transistor

fails,

causing

other

transistors

fail.

Replacing

only

one

transistor

and

turning

power

on,

before

checking

for

additional

faulty

components

could

damage

the

replaced

component.

When

soldering

semi-conductor

devices,

hold

the

lead

being

soldered

with

pair

pliers

commer-

cial

heat

sink

device

placed

between

the

component

and

the

solder

joint.

NOTE:

The

leakage

resistance

obtained

from

simple

resistance

check

capacitor

not

always

indication

faulty

capacitor.

all

cases

the

capacitors

are

shunted

with

resistances,

some

which

have

low

values.

Only

dead

short

true

indication

shorted

capacitor.

PRINTED

CIRCUIT

BOARD

MAINTENANCE

TECHNIQUES

foil

intact,

but

not

covered

with

solder,

good

contact.

not

attempt

cover

with

solder.

Voltage

measurements

can

made

from

either

side

the

board.

Use

needle-point

probe

penetrate

the

wiring

whenever

protective

coating

used

the

wiring.

brass

probe

can

soldered

alligator

clip

adapted

measuring

instrument.

Always

use

heat

sink

when

soldering

transistors;

transistor

pad

with

mounting

feet

effective

heat

sink.

Broken

damaged

printed

wiring

usually

the

result

imperfection,

strain

careless

soldering.

repair

small

breaks,

tin

short

piece

hook-up

wire

bridge

the

break,

and

holding

the

wire

place,

flow

solder

along

the

length

wire

that

becomes

part

the

circuitry.

When

unsoldering

components

from

the

board

never

pry

force

loose

the

part;

unsolder

the

component

using

the

wicking

process

described

below:

Select

3/16

inch

tinned

copper

braid

for

use

wick;

braid

not

available,

select

AWG

No.

stranded

wire

with

1/2

inch

insulation

removed.

IM-LJS-13A

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