Lambda Lp series User manual

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TABLE

OF

CONTENTS

Section

ii

SPECIFICATIONS

AND

FEATURES

. •' . . . .

THEORY

OF

OPERATION

OPERATING INSTRUCTIONS .

Controls,

Instruments

and

Fuses

Ground

Connections

Basic

Modes

of

Operation

Supply-Load

Connections

•

Detailed

Operating

Procedures

Operation

After

Protective

Device

Shutdown

MAINTENANCE

General

Trouble

Analysis

Checking

Transistors

and

Capacitors

. .. . . . . . . .. .

Printed

Circuit

Board

Maintenance

Techniques

Trouble

Chart

• • . . • . . . . •

Adjustment

of

Calibration

Controls

Performance

Checks

. . . . . . . . .

Removal

of

Printed

Circuit

Board

For

Servicing

SERVICE

..•••

PARTS

'

ORDERING.

•

•••

PARTS

LIST

........

.

USE

OF

RACK

ADAPTERS

(Fig.

13)

Installation

of

1/2

Rack

Units

into

LRA-1

(Fig.

13).

Shipment

of

Units

Mounted

in

LRA-1

(Fig.

13).

Mounting

Chassis

Slides

(Fig.

13).

Using

Blank

Panels

and

Blank

Chassis

(Fig.

13).

-~~~

--

=

·

··

--

~--

Page

1

5

7

8

10

15

17

18

21

22

24

LP-1

IM-LP400

Jl

. a

~~_.

.~

"

j,

..

p:;

!:·~

:_

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SPEC

I

Fl

CATIONS

AND

FEATURES

Specifications

apply

for

the

non-meteredand

the

metered

models.

DC

OUTPUT--Voltage

regulated

for

line

and

load

Voltage

Range

••

•

••••..

oo

TABLE

I

VOLTAGE RANGE

MODEL

LP-410 LP-411

LP-412

VOLTAGE

0-10

0-20 0-40

RANGE VDC

LP-413

LP-414

LP-415

0-60

0-120

0-25

0

Multi-Current

Ranges

•••.••.

Current

range

must

be

chosen

to

suit

the

appropriate

MODEL

LP-410

LP-411

LP-412

LP-413

LP-414

LP-415

·

maximum

ambient

temperature.

Current

ratings

apply

for

entire

v

oltage

range

•

TABLE

II

MAX.

CURRENT

MAX.

CURRENT

AT

AMBIENT

OF:

300C

4ooc

500C

60°C

2A

1.8A

1.6A 1.4A

1.2A 1.1A

LOA

O.SA

0.

70A Oo65A

0.60A 0.50A

0.45A 0.41A 0.37A 0.33A

0.20A

0.18A

0.16A

0.12A

SOMA

72MA 65MA 60MA

REGULATED

VOLTAGE

OUTPUT

Regulation

(line)

••....•.

o

•.

0.

01

percent

plus

1.

0

millivolt

for

input

variations

from

105-132

or

132-105

volts

AC

Regulation

(load)

.•••.••••.•

0.

01

percent

plus

1.

0

millivolt

for

load

variations

from

no

load

to

full

load

or

full

load

to

no

load

IM-LP400

1

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Remote

Programming

External

Resistor

••••••••

Nominal

200

ohms

/volt

output

Programming

Voltage

••••••

One-to-one

voltage

change

Ripple

and

Noise

•••••.••••••

500

microvolts

rms;

1.

5

millivolts

peak-to-peak

with

either

positive

or

negative

terminal

grounded

,

for

all

units

except

LP415-

FM; L

OMV

rms;

3.

OMV

peak-to-peak

for

LP415-FM

Temperature

Coefficient

•..•.

Output

change

in

voltage

less

than

(0. 015% +

0.

5 mv)

/OC

DC

OUTPUT--Current

regulated

for

line

and

load;

automatic

crossover

with

voltage

limit

Multi

-Current

Ranges

•••••.••

Current

range

must

be

chosen

to

suit

the

appropriate

maximum

ambient

temperature.

Current

ratings

apply

for

entire

voltage

range.

For

maximum

current

range

see

Table

II.

Minimum

current

1%

of

300

ambient

rating

in

Table

II

or

5

rna.

,

whichever

is

greater.

Voltage

Range

•...•••.•••••.•

For

voltage

range

see

Table

I;

voltage

ratings

apply

for

entire

current

range.

REGULATED CURRENT

OUTPUT;

AUTOMATIC CROSSOVER

Regulation

(line)

••••.•••••••

Less

than

0.

2%

or

5

milliamperes,

whichever

is

greater,

variations

from

105-132

or

132-105

volts

AC

Regulation

(load)

•.••••.•••••

Less

than

0.

2%

or

5

milliamperes,

whichever

is

greater,

for

load

voltage

changes

from

0

to

max.

or

max.

to 0

volts

DC

AC

INPUT--105-132

volts

AC

at

57-63

Hz.

For

input

power

see

Table

m.

,

For

440 HZ input,

consult

factory.

TABLE III

INPUT POWER, WATTS*

MODEL

INPUT

POWER

LP-410

85

Watts

L:P-411

75

Watts

LP-412

70

Watts

LP-413

65

Watts

LP-414

60

Watts

LP-415

50

Watts

*With

output

loaded

to

full

30°C

rating

and

input

voltage

132

volts

AC,

60 Hz

2

IM-LP400

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OVERLOAD PROTECTION

Thermal

••••••••.•••••••••••

Thermostat,

resets

automatically

when

over-temper-

ature

condition

is

eliminated

Electrical

External

•••••

o

•••

o • o

•••

Adjustable,

automatic,

electronic

current-limiting

circuit,

settable

to

105

percent

of

rated

current;

limits

output

current

to

preset

limit

for

protection

of

load

and

power

supply

when

external

overloads

and

direct

shorts

occur

Internal

o

••••••••••••••

Fuse,

''SLO-BLO",

1.

5A,

fuse

Fl

protects

the

AC

input

circuit.

Overload

of

the

supply

does

not

cause

fuse

failure

Fuse

F2

pro

v

ides

protection

against

internal

circuit

failure

in

conjunction

with

overvoltage

protector

option

INPUT

AND

OUTPUT

CONNECTIONS--Heavy

duty

terminal

block

on

rear

of

chassis

with

5-foot,

3-wire

detachable

line

cord

for

all

models;

five-way

binding

posts

provide

for

additional

positive

(+),

ground,

and

negative

(-)

DC

output

connections,

on

front

panel

of

FM

models

OVERSHOOT--No

overshoot

of

output

voltage

under

conditions

of

power

turn-on,

pqwer

turn-

off

or

power

faillire

OPERATING AMBIENT

TEMPERATURE

RANGE

AND

DUTY

CYCLE--Continuous

duty

from

ooc

to

60°C

ambient

with

corresponding

load

current

ratings

for

all

modes

of

operation

STORAGE

TEMPERATURE-

(non'

-operating)

METERS-Voltmeter

and

ammeter

on

metered

suffix

(FM)

models

CONTROLS

DC

output

controls

o

••••••••••

Coarse

and fine

voltage

controls

and

coarse

and fine

current

controls

permit

adjustmentof

DC

output;

located

on

front

panel

of

all

models

Binding

Posts

(+)

(-)

(GND)

....

Five-waJ:

binding

posts

on

all

models.

Remote

Sensing.

• . • • • .

Provision

is

made

for

remote

sensing

to

eliminate

effect

of

power

output

lead

resistance

on DC

regulation

.

Power.

•

Panel

mounted

switch

and

indicator

light

for

all

units

Test

Jacks

(+) (

-)

• •

Test

jacks

for

non-metered

models

permit

checking

· · .

DC

voltage

output

with

external

meters

IM-LP400

3

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PHYSICAL DATA

Size

o •

Weight

Panel

Finish

• •

5-3/16

11

H X

4-3/16

11

W X 10

11

D

• • • 7

lbs.

net;

8

lbs.

shipping

wt.

••

o •

Brushed

aluminum

clear

anodized

panels

with

grey

inlay

(standard);

special

finishes

available

to

customer's

specifications

at

moderate

surcharge

MOUNTING:

Laboratory

bench,

table

top

•.

Bumpers

secured

to

the

base

of

all

LP

units

permit

proper

circulation

of

air

through

the

unit.

Removal

of

bumpers

will

restrict

free-flow

of

air

through

the

unit,

avoid

removing

bumpers

Standard

19

11 R:wk

All

LP

units

can

be

used

with

rack

adapters:

LRA-1

(slide

accomodation

provided)

LRA-2

(conventional

mount) See

figure

13

MODEL OPTIONS

Suffix

"R"

Fungus

Proofing

Option . • . . . • • . o • •

Standard

LP

power

supplies

can

be

obtained

with

Suffix

11

FM

11

Meter

Option

Suffix "v" Option •

fungus

proofing

treatment

with

MIL V 173

varnish

for

all

fungi

nutrient

components

Standard

LP

power

supplies

can

be

obtained

with

voltmeter

and

ammeter.

Standard

LP

power

supplies

can

be

obtained

for

205:-265 VAC, 50 Hz

input

ACCESSORIES

4

Rack

Adapters

• • o • o • •

Rack

adapter

LRA-1,

with

or

without

chassis

slides

is

available

as

well

as

rack

adapter

LRA-2

which

is

used

for

simple

rack

installations

where

chassis

slides

are

not

required

Blank

Panels

• • . • • • • o

Half-rack

and

quarter-rack

panels

can

be

used

with

the

Lambda

rack

adapters,

see

figure

13 ·

Overvoltage

Protector

o • • •

Externally

mounted,

Overvoltage

Protectors

LHOV

-4,

LHOV

-5

and

LHOV

-6

are

available

for

use

with

LP

power

supplies

LP~410,

LP-411,

LP-412

and

LP-413

IM-LP400

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THEORY

OF

OPERATION

GENERAL

The

Lambda

power

supply

consists

of

an

AC

input

circuit

and

transformer;

a

bias

supply

consisting

of

an

auxiliary

rectifier

and

filter,

and

preregulator;

a

main

regulator

circuit

consisting

of

the

main

rectifier

and

filter,

a

series

regulator,

emitter

follower

driver(s),

a

current

comparator,

a

voltage

comparator,

a

voltage

amplifier,

current

and

voltage

sensing

networks

and

a

voltage

reference

circuit.

The

circuit

arrangement

is

shown

in

block

diagram

form,

·

Figure

10.

The

circuitry

is

discussed

with

reference

to

the

block

diagram

and

the

schematic

diagram.

FUNCTIONAL

DESCRIPTION

Single

phase

input

power

is

applied

to

transformer

Tl

through

the

input

circuit

con-

taining

a

built-in

thermostat

and

fuse

Fl,

which

protect

the

supply

against

overheating

and

internal

faults.

The

main

rectifier,

a

full-wave

rectifier,

provides

the

power

which

is

filtered

by

capacitor

C9

and

then

regulated

via

a

series

regulator

and

delivered

to

the

output.

Half-

wave

auxiliary

rectifier

CRl

provides

voltage

filtered

by

capacitor

C2

for

voltage

amplifier-

Q4

and

preregulator

Ql.

Preregulator

Ql

provides

regulated

power

for

zener

diode

CR3,

which

is

the

reference

element

for

the

current

sensing

circuit,

for

current

comparator

Q2,

Q3,

voltage

comparator

Q5,

Q6,

and

for

Q7

and

zener

diode

CR7,

which

together

function

as

the

voltage

reference

for

constant

voltage

operation.

CR8

provides

voltage

compensation

which

acts

to

reduce

the

effect

of

temperature

changes

on

the

emitter-base

bias

of

Q7.

Constant

voltage

or

constant

current

crossover

circuit

operation

is

determined

by

changes

in

the

load.

A

change

in

the

output

voltage

is

sensed

by

voltage

sensing

divider

R30A,

B,

which

has

a

constant

current

of

5

milliamperes

flowing

in

the

divider

element

,

determined

by

Q7

and

the

setting

of

calibration

control

R20.

This

output

voltage

variation

causes

a

change

to

the

input

of

Q6

of

the

voltage

comparator,

which

compares

it

with

the

reference

voltage

determined

by

CR7,

resulting

in

an

error

signal

at

the

output

of

Q5.

In

constant

voltage

operation,

the

voltage

across

R29

is

less

than

the

preset

voltage

across

R6A, B; Q2

and

CR4

are

at

cutoff; Q3

is

in

saturation

and

CR6

is

conducting.

If

the

load

current

decreases,

causing

a

rise

in

output

voltage,

Q6

conducts

less,

Q5

is

biased

toward

cutoff

and

the

current

from

R18

flows

through

OR

gate

diode

CR6

instead

of

Q5.

This

action

causes

amplifier

Q4

to

conduct

more

heavily,

reducing

drive

current

to

the

base

of

driver

Q8,

causing

the

series

regulator

impedance

to

increase

and

the

output

voltage

to

decrease

accordingl

y. · ·

Simultaneously,

Q2

of

the

current

comparator

samples

the

load

current

through

current

sensing

resistor

R29

and

compares

it

with

the

reference

voltage

across

current

sensing

divider

R4,

R5

and

R6A,

B,

determined

by

zener

diode

CR3.

In

constant

current

crossover

operation,

the

voltage

across

R29

is

approximatel

y

equal

to

the

preset

voltage

across

R6A,

B,

Q2

will

conduct

and

bias

Q3

toward

cutoff,

causing

the

current

from

RlO

to

flow

through

OR

gate

diode

CR4

instead

of

Q3.

Similarly,

this

action

will

cause

amplifier

Q4

to

conduct

more

hea

v

ily,

reducing

drive

current

to

the

base

of

QS,

causing

the

series

regulator

impedance

to

increase

and

the

output

voltage

to

decrease

accordingly,

effectively

maintaining

a

constant

current.

This

output

voltage

decrease,

sensed

by

the

voltage

sensing

network,

causes

Q6

to

be

reverse

biased,

turning

it

off

and

causes

turn-on

of

Q5

till

saturation

occurs

IM-LP400

5

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6

and

OR

gate

CR6

stops

conducting.

The

untt

now

continues

to

function

ill

the

constant

cur-

rent

mode

of

operation,

with

OR

gate

diode

CR4

controlling

the

turn-on

bias

of

Q4,

which

in

turn

controls

the

drive

current

to

the

series

regulator

and

ultimately

the

output

voltage

of

the

supply.

In

model

LP-415

tandem

transistors

Q9,

Qll

are

used

to

share

the

total

series

regulator

voltage.

Resistors

R32

and

R33

fix

the

base

of

QlO

at

approximately

one-half

of

the

total

series

regulator

voltage.

The

emitter

current

from

QlO

controls

tandem

regulator

Qll,

which

tracks

with

Q9

to

split

voltage

and

power.

For

example,

when

voltage

across

Q9

increases

due

to

a

regulating

action,

the

current

in

R32 and R33

also

increases,

causing

base

of QlO

to

be

biased

toward

cutoff

which

in

turn

biases

Qll

toward

cutoff

so

that

the

voltage

across

Qll

increases

until

the

voltage

across

Qll

and

Q9

are

approximately

equal.

IM-LP400

;

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.

~

.

...

OPERATING

INSTRUCTIONS

CONTROLS, INSTRUMENTS AND FUSES

Power

ON-OFF

Switch.

The

power

ON-OFF

switch,

located

on

the

front

panel,

controls

application

of input

power

to

the

supply. When

the

switch

is

in

the

ON

position,

the

red

power

on

indicator

glows.

OUTPUT VOLTAGE

Control.

The

OUTPUT

VOLTAGE

control

is

a

dual

control

consisting

of

a

coarse

adjustment

potentiometer,

which

varies

the

DC

voltage

over

a

range

of

0-9

-,

0-19, 0-39,

0-59,

0-117.5,

0-247.5

volts

as

applicable,

and

a

fine

adjustment

potentio-

meter,

which

varies

the

DC

voltage

over

a

one-volt

range.

*

Clockwise

rotation

results

in

increasing

voltage.

The

total

DC

voltage

output

for

voltage

regulated

operation

is

equal

to

the

sum

of

each

shaft

setting;

for

current

regulated

operation

the

maximum

voltage

limit

is

equal

to

the

sum

of

each

shaft

setting.

The

control

is

located

on

the

front

panel

of

all

·

units.

*

For

model

LP-415

the

DC

voltage

fine

adjustment

range

is

2. 5

volts.

CURRENT LIMITER

Control.

The

CURRENT LIMITER

control

is

a

dual

control

consisting

of

a

coarse

adjustment

potentiometer,

which

varies

the

DC

current

over

90% of

the

rated

current

range* and a

fine

adjustment

potentiometer,

which

varies

the

DC

current

over

10% of

the

rated

current

range.

Clockwise

rotation

results

in

increasing

current.

The

total

DC

current

output

for

current

regulated

operation,

is

equal

to

the

sum

of

each

shaft

setting;

for

voltage

regulated

operation

the

maximum

current

limit

is

equal

to

the

sum

of

each

shaft

setting.

The

control

is

located

on

the

front

panel

of

all

units.

*Operation

for

output

current

below

rated

limits

can

result

in

no output

or

no

regula-

tion.

Output

Voltage

Meter.

· A DC

voltmeter

monitors

the

voltage

at

the

output

terminals

of

metered

(FM)

units

for

the

rated

voltage

range.

Output

Qurrent

Meter.

A

DC

ammeter

monitors

the

load

output

current

of

metered

(FM)

units

for

the

rated

current

range.

Fuses~

Fuse

F1,

internally

located,

is

a 1. 5

ampere,

3AG

"SLO-BLO"

fuse

which functions

in

the

AC

input

circuit.

Fuse

F2,

internally

located,

provides

protection

against

internal

circuit

failure.

See.

schematic

diagrams

for

current

ratings

of

pertinent

F2

fuse.

Connection

Terminals.

Make

all

connections

to

the

supply

at

the

terminal

block

on

the

rear

of

the

supply.

DC output

connections

can

also

be

made

at

the

five-way

binding

posts

located

on

the

front

panel

of·

FM

models

• . Apply

input

power

through

the

line

cord

or

directly

to

terminals

1

and

2

if

the

line

cord

is

removed.

Always

connect

the

ungrounded

(hot)

power

lead

to

terminall.

The

supply

positive

terminal

is

brought

out

to

terminal

6.

The

supply

negative

terminal

is

brought

out

to

terminal

4.

Recommended

wiring

of

the

power

supply

to

the

load

and

selection

of

wiring

is

shown

in

figures

1

through

9.

Selection

of

proper

wiring

is

made

on

the

basis

·of

load

requirements.

Make

all

performance

checks

and

measurements

of

current

or

voltage

at

the

rear

output

terminals.

Connect

measuring

devices

directly

to

terminals

or

use

the

shortest

leads

possible.

IM-LP400

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GROUND CONNECTIONS

The

Lambda

power

supply

can

be

operated

either

with

negative

or

positive

output

terminal

grounded

or

with

no

terminal

grounded.

Both

positive

and

negative

ground

con-

nections

are

shown

in

the

diagrams

for

all

suggested

output

connections

illustrated

in

this

manual.

·

NOTE:

When

operating

the

supply

with

neither

term-

inal

grounded,

high

impedance

leakage

resistance

and

capacitance

paths

can

exist

between

the

power

supply

circuitry

and

chassis

ground.

BASIC MODES

OF

OPERATION

This

power

supply

is

designed

to

operate

as

a

constant

voltage

source

or

as

a

constant

currentsource.

Automatic

crossover

to

either

mode

of

operation

occurs

when

load

con-

ditions

change

as

follows:

Constant

Voltage.

The

power

supply

will

function

as

a

constant

voltage

source

while

the

load

current

does

not

equal

the

current

value,

ILnvr.

set

by

the

CURRENT

LIMITER

control

When

load

current

IL

=

~L=

ILIM,

the

supply

will

cross

over

\

automatically

and

will

operate

as

a

constant

current

source.

Further

decrease

in

value

of

lqad

resistance

RL

results

in

decrease

of

voltage

across

the

load

while

current

remains

regulated

to

ILIM·

Constant

Current

(Automatic

Crossover).

The

power

supply

will

function

as

a

constant

current

source

while

the

load

voltage

VL

does

not

equal

the

voltage

value

set

by

the

OUTPUT

VOLTAGE

control.

When

load

voltage

VL

equals

the

value

set

by

\

the

OUTPUT

VOLTAGE

control,

the

supply

will

automatically

cross

over

and

operate

as

a\

ponstant

voltage

source.

\

~\

SUPPLY

LOAD CONNECTIONS

NOTE:

Refer

to

DETAILED

OPERATING

PROCEDURES

for

step-by-step

instructions

for

operation

of

power

supply.

Connections

For

Operation

as

a

Constant

Voltage

Source

.

The

output

impedance

and

regulation

of

the

power

supply

at

the

load

may

change

·

when

using

the

supply

as

a

constant

voltage

source

and

connecting

leads

of

practical

length

are

used.

To

minimize

the

effect

of

the

output

leads

on

these

characteristics,

remote

sensing

is

used.

Recommended

types

of

supply-load

connections

with

local

or

.

remote

sensing

are

described

in

the

following

paragraphs.

Refer

to

figure

1

to

determine

voltage

drop

for

particular

cable

length,

wire

size

and

current

conditions.

Lead

lengths

must

be

measured

from

supply

terminals

to

load

terminals

as

shown

in

figure

2.

8

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Two-Wire

Connection,

Figure

3.

The

.

two-wire

connection,

with

local

sensing,

is

the

,..,..---

..

connection

suitable

for

application

with

relatively

constant

load.

Four-,.Wire

Connection,

Figure

4.

The

four-wire

connection

with

remote

sensing,

provides

complete

compensation

for

the

DC

voltage

drops

in

the

connecting

cables.

·

Compensation

for

lead

drop

is

also

valid

for

gradual

changes

of

load

current.

·

Pro

rammed

Voltage

Connections,

Using

External

Resistor,

Figure

5.

Discrete

voltage

steps

can

be

programmed

with

a

resistance

vo

tage

divider

valued

at

200

ohms/volt

output

and

a

shorting-type

switch

as

shown

in

figure

5.

When

continuous

voltage

variations

are

required,

use

variable

resistor

with

the

same

200

ohms/volt

ratio

in

place

of

the

resistive

voltage

divider

and

shorting-type

switch.

Use

a low

temperature

coefficient

resistor

to

assure

most

stable

operation.

As shown

in

figure

5,

voltages

can

be

programmed

utilizing

either

local

or

remote

sensing

connections,

as

desired.

Programmed

Voltage

Connections

Using

Programming

Voltage,

Figure

6.

The

power

supply

voltage

output

can

be

programmed

with

an

externally

connected

programming

power

supply.

The

output

voltage

of

the

programmed

supply

will

maintain

a

one-to-one

ratio

with

the

voltage

of

the

programming

supply.

The

programming

supply

must

have

a

reverse

current

capability

of

6

rna.

minimum.

Alternatively,

when

supplies

with

less

than

6

rna.

reverse

current

capability

are

used,

a

resistor

capable

of

drawing

6

rna.

at

the

minimum

programming

voltage

must

be

cctnnected

across

the

output

terminals

of

the

supply.

This

programming

supply

must

be

/"

"'"""

.

rated

to

handle

all

excess

resistor

current

at

the

maximum

programming

voltage.

Ct">nnections

For

Operation

as

a

Constant

Current

Source

Automatic

Crossover

Constant

Current

Connections,

Figure

3.

Figure

3

shows

the

con-

nections

which

are

used

when

operating

the

power

supply

as

a

constant

current

source

with

automatic

crossover,

using

local

setting

of

current

control*

*Setting

control

for

output

currents

below

rated

limits

can

result

in

no

output

or

no

regulation.

In

this

mode

of

operation,

when

the

load

voltage

increases,

due

to

changing

load

resistance,

to

the

limit

of

the

OUTPUT

VOLTAGE

control

setting,

the

power

supply

crossover

circuit

will

cause

the

unit

to

operate

as

a

constant

voltage

supply.

Connections

For

Series

Operation

The

voltage

capability

of

LP

power

supplies

can

be

extended

by

series

operation

of

two

LP

power

supplies

of

equal*

voltage

ratings.

A

maximum

of

300

volts

can

be

con-

nected

between

either

the

+DC

or

-DC

terminal

and

chassis

ground,

and

a

maximum

voltage

capability

of

500

volts

is

possible

for

model

LP415.

*For

applications

using

supplies

of

unequal

ratings,

consult

factory

for

details

of

operation.

Diodes

CR1 and

CR2,

must

each

be

capable

of

withstanding

the

maximum

.rated

current

of

the

units

in

the

series

combination,

figure

7.

IM-LP400

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This

method

permits

operation

for

either

constant

voltage

or

constant

current

with

automatic

crossover

to

either

mode

of

operation

whenever

the

respective

limiting

operating

-

~

current

or

voltage

is

reached.

Figure

7

shows

connection

for

either

local

or

remote

sensing.

Connections

For

Parallel

Operation

The

current

capability

of

LP

power

supplies

can

be

extended

by

parallel

operation

of

two

LP

power

supplies

of

equal*

voltage

capacities.

The

two

units

are

shown

connected

for

parallel

operation

in

figures

8,

9. One

power

supply

designated

the

"master"

or

(M)

unit

controls

its

own

output

as

well

as

the

output

of

the

second

power

supply,

designated

the

"slave"

or

(S)

unit.

*For

applications

using

supplies

of

unequal

voltage

ratings,

consult

factory

for

details

of

operation.

Unit

(S)

operates

to

regulate

its

current

in

a

ratio

to

that

of

the

(M)

unit

by

comparing

the

current

in

its

internal

sampling

resistor

with

that

current

sampled

by

the

master

internal

sampling

resistor.

When

power

supplies

of

unequal

current

capacities

are

parallel

connected,

the

division

of

current

supplied

will

be

approximately

equal

to

the

ratio

of

the

current

ratings

of

the

supplies.

Parallel

connected

units

can

be

operated

for

constant

voltage

with

local

sensing,

fig-

ure

8,

or

remote

sensing,

figure

9,

as

well

as

for

constant

current

with

automatic

cross-

over,

figure

8.

When

operating

for

constant

voltage,

the

(M)

unit

can

automatically

cross

over

into

constant

current

operation.

DETAILED OPERATING PROCEDURES

SAFETY

NOTICE

DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT. OBSERVE

THE USUAL

SAFETY

PRECAUTIONS WHEN OPERATING

ORSER-

VICING THE EQUIPMENT TO AVOID SHOCK OR INJURY.

Constant

~

Voltage

Operation,

Adjustable

Current

Limit

1.

Remove

AC

power

to

the

supply

and

place

power

ON...;OFF

switch

in

OFF

position

before

connecting

load

to

the

supply.

2.

Determine

load

requirements,

select

wire

size

from

figures

1

and

2

and

choose

desired

type

of

supply-load

connection

from

figures

3

and

4.

3.

Connect

supply

to

load

as

shown on

the

selected

connection

diagram.

NOTE: When

shipped

from

the

factory,

the

supply

is

ready

for

use

as

a

local-sensing

constant

voltage

source

with

automatic

crossover

or

as

a

constant

current

source.

Jumpers

are

connected

at

the

factory

as

shown

in

figure

3.

Take

care

to

remove

the

appropriate

jumpers

for

load

re-

quirements

that

need

different

supply-load

connections.

Refer

to

the

appropriate

connection

diagram.

4.

Turn

OUTPUT

VOLTAGE

control

knobs

to

the

desired

voltage

setting.

;

10

IM-LP400

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..

5.

When

current

to

the

load

must

be

limited

to

an

intermediate

value

within

the

current

rating

of

the

supply,

turn

the

CURRENT

LIMITER

controls

to

the

desired

current

limit

setting.

If

no

intermediate

current

limit

is

required,

turn

the

control

CW

to

the

position

for

full

current

rating

for

the

maximum

ambient

temperature

of

operation.

Refer

to

section

on

Specifications

and

Features.

6.

Apply AC

power

to

the

supply.

7.

Place

power

ON-OFF

switch

in

ON

position

and

check

that

red

power

ON

indicator

is

lit.

8.

Check

that

output

current*

and

output

voltage

meters

indicate

desired

values;

as

required,

adjust

OUTPUT

VOLTAGE

control

knobs

and

CURRENT

LIMITER

controls

to

obtain

correct

meter

indications.

For

non-metered

models

use

externally

coru1ected

meters

and

check

that

correct

meter

indications

exist

at

output

terminals

6

and

4,

or

at

front

panel

test

jacks

(+)

and(-)

for

voltage

checks

only;

for

remote

sensing

connections,

check

at

the

load

terminations

of

sensing

leads

on

terminals

3

and

7.

*Ammeter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5

rna.

point

as

zero

point.

9.

Power

supply

is

now

in

proper

operation.

Programmed

Constant

Voltage

Operation,

Adjustable

Current

Limit

L

Remove

AC

power

input

to

the

supply

and

place

power

ON-OFF

switch

in

OFF

position

before

connecting

load

to

the

supply.

2.

Determine

load

requirements,

select

wire

size

and

length

from

figures

1

and

2

and

choose

desired

type

of

supply-load

connection

from

figures

5

or

6.

Refer

to

para-

graph

on

Programmed

Voltage

Connections.

3.

Connect

supply

to

load

as

shown

on

the

selected

connection

diagram

. As

shown

in

figure

5,

take

care

to

use

a

shorting-type

switch

for

the

external

programming

control

when

several

voltages

are

desired

and

the

programming

voltage

method

is

not

used.

4.

Turn

OUTPUT

VOLTAGE

control

knobs

to

the

extreme

CCW

position.

Adjust

external

programming

voltage

control

to

desired

voltage

setting

.

5.

When

current

to

the

load

must

be

limited

to

an

intermediate

value

within

the

current

rating

of

the

supply,

turn

the

CURRENT LIM

ITER

controls

to

the

desired

current

limit

setting.

If

no

intermediate

current

limit

is

desired,

turn

the

controls

CW

to

the

position

for

full

rated

current

for

the

ambient

temperature

of

operation.

Refer

to

section

on

Specifications

and

Features.

6.

Apply AC

power

to

the

supply.

7.

Place

power

ON-OFF

switch

in

ON

position

and

check

that

red

power

ON

indicator

is

lit.

8.

Check

that

output

current*

and

output

voltage

meters

indicate

desired

values;

as

required,

adjust

CURRENT

LIMITER

controls

and

external

programming

voltage

control

to

obtain

correct

meter

indications.

For

non-metered

models

use

externally

connected

meters

and

check

that

correct

meter

indications

exist

at

output

terminals

4

JM..:.LP400 11

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and

6,

or

at

front

panel

test

jacks

(+)and(-)

for

voltage

checks

only;

for

remote

sensing

connections

check

at

the

load

terminations

of

sensing

leads

on

terminals

3

and

7.

*Ammeter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5

rna.

point

as

zero

point.

Constant

Current

Operation

With

Crossover,

Adjustable

Voltage

Limit

1.

Remove

AC

power

input

to

the

supply

and

place

power

ON-OFF

switch

in

OFF

position

before

connecting

load

to

the

supply.

2.

Determme

load

requirements,

select

wire

size

and

length

from

figures

1

and

2

and

connect

load

to

the

supply

as

shown

in

figure

3.

·

3.

Turn

the

CURRENT

LIMITER

controls

to

the

desired

current

setting.

4.

When

load

voltage

must

be

limited

to

an

intermediate

value

within

the

voltage

rating

of

the

supply,

turn

OUTPUT

VOLTAGE

control

knobs

to

the

desired

voltage

limit

setting.

If

no

intermediate

voltage

limit,

within

rating

of

supply

is

desired,

turn

controls

to

the

full

CW

position

to

obtain

voltage

limit

at

maximum

voltage

rating

of

the

supply.

5. Apply

AC

power

to

the

supply.

6.

Place

power

ON-OFF

switch

in ON

position

and

check

that

red

power

ON

indicator

is

lit.

7.

Check

that

output

current*

and

output

voltage

meters

indicate

desired

values;

adjust

OUTPUT

VOLTAGE

control

knobs

and

CURRENT

LIMITER

controls

as

required

to

obta)n

correct

indications.

For

non.,-metered

models

use

externally

connected

meters

and

check

that

correct

meter

indications

exist

at

output

terminals

4

and

6,

or

at

front

panel

test

jacks

(

+)

and

(-)

for

voltage

checks

only.

*Ammeter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5 rna.

point

as

zero

point.

8.

Power

supply

is

now in

proper

operation.

S~ries

Connection

Constant

Voltage

Operation,

With

Current

Limit

1.

Remove

AC

power

input

to

both

units

and

place

power

ON-OFF

switches

in

OFF

position

before

connecting

load

to

the

supplies.

2.

Determine

load

requirements,

select

wire

size

from

figures

1

and

2

and

connect

·

in

accordance

with

figure

7.

Refer

to

paragraph

on

Connections

for

Series

Operation.

3.

Select

diodes

CR1

and

CR2

in

accordance

with

instructions

contained

in

Con-

nections

for

Series

Operation.

4.

Turn

OUTPUT

VOLTAGE

control

knobs

of

both

units

to

obtain

the

desired

output

voltage.

These

settings

must

be

the

output

voltage

for

the

combination.

5.

When

current

to

the

load

must

be

limited

to

an

intermediate

value

within

current

rating

of

the

un1ts,

turn

the

CURRENT

LIMITER

controls

of

each

unit

to

a

setting

equal

to

12

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desired

total

current

limit

for

the

combination.

If

rio

intermediate

current

limit

is

re-

-quired,

turn

the

controls

of

each

unit

CW

to

the

position

for

full

current

rating

for

the

maximum

ambient

temperature

of

operation.

Refer

to

section

on

Specification

and

Features.

6.

Apply AC

power

to

the

supplies.

7.

Place

power

ON-OFF

switches

of

both

units

in

ON

position

and

check

that

red

power

ON

indicators

are

lit.

8.

Check

that

output

current*

and

output

voltage

meters

indicate

desired

values;

total

voltage

is

equal

to

sum

of

output

voltage

of

both

units~

As

required,

adjust

OUTPUT

VOLTAGE

control

knobs

and

CURRENT

LIMITER

controls

of

the

units

to

obtain

correct

indications.

For

non-metered

models

use

externally

connected

meters

and

check

that

correct

meter

indications

exist

at

output

terminals

of

both

units;

positive(+)

terminal

6 of

unit

(1)

and

minus

(-)

terminal

4

of

unit

(2)

are

the

output

terminals

of

the

series

combin-

ation.

*Ammeter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5

rna.

point

as

zero

point.

Use

front

panel

jacks

(+)

of

unit

(1)

and

(

-)

of

unit

(2)

to

make

output

voltage

check

for

the

series

combination.

For

remote

sensing

connection,

make

checks

at

the

load

terminations

of

sensing

leads

from

terminal

7

of

unit

(1)

and

from

terminal

3

of

unit

(2).

9.

Power

supplies

are

now

in

proper

operation

•

.

....--

.

;,Series

Connection

Constant

Current

Operation,

With

Voltage

Limit

..

1.

Remove

AC

power

input

to

both

units

and

place

power

ON-OFF

switches

in

OFF

position

before

connecting

load

to

the

supplies

0

2.

Determine

load

requirements,

select

wire

size

from

figures

1

and

2

and

make

supply-load

connections

shown

in

figure

7A.

Refer

to

paragraph

on

Connections

for

Series

Operation.

3.

Select

diodes

CR1

and

CR2

as

instructed

in

Connections

for

Series

Operation

paragraph.

4.

Turn

CURRENT

LIMITER

controls

of

each

unit

to

the

desired

setting.

5.

When

load

voltage

must

be

limited

to

an

intermediate

value

within

the

voltage

rating

of

the

series

combination,

turn

the

OUTPUT

VOLTAGE

control

knobs

to

a

position

for

total

intermediate

voltage

required

for

the

combination.

Total

voltage

is

the

sum

6f

the

voltage

settings

of

each

unit.

If

no

intermediate

voltage

limit

is

required,

turn

the

controls

to

the

full

CW

position

to

obtain

voltage

limit

at

the

maximum

combined

ratings

of

the

supplies.

6.

Apply AC

power

to

the

supplies.

7.

Place

power

ON-OFF

switches

of

both

units

to

ON

position

and

check

that

red

,..--

..._,

power

ON

indicators

are

lit.

IM-LP400

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8.

Check

that

output

current*

and output

voltage

meters

indicate

desired

values;

total

voltage

is

the

sum

of (1) and (2)

unit

voltages.

As

required,

adjust

OUTPUT

VOLTAGE ·

,....-..._

..

control

knobs and

CURRENT

LTI\1ITER

controls

of

units

to

obtain

correct

indications.

For

non-metered

models,

use

externally

connected

meters

and

check

that

correctmeter

in-

dications

exist

at

output

terminals

of

the

(1) and (2)

units;

positive

(+)

terminal

6

of

(1)

uriit

and

minus

(-)

terminal4

of

the

(

2)

unit

are

the

output

terminals

of

the

series

combination.

*Ammeter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5

ma.

point

as

zero

point.

Use

front

panel

jacks(+)

of

(1)

unit

and(-)

of(2)

unit

to

make

output

voltage

check

on

non-metered

units.

9o

Power

supplies

are

now

in

proper

operation.

Parallel

Connection

Constant

Voltage

Operation,

With

Current

Limit

1.

Remove

AC

power

input

to

each

supply and

place

power

ON-OFF

switch

on

both

(M) and

(S)

units

in

OFF

position

before

connecting

load

to

the

supplies.

2.

Determine

load

requirements,

select

wl.re

size

from

figures

1

and

2

in

the

manual.

Refer

to

paragraph

on Connections

for

Parallel

Operation.

3.

Connect

supplies

to

load

as

shown

in

connection

diagram,

figure

8

for

local

sensing,

or

figure

9

for

remote

sensing.

Choose

correct

value

for

REXT

from

VALUE

CHART~

~

NOTE: When

shipped

from

the

factory

,

each

supply

is

ready

for

use

as

a

local-sensing

constant

voltage

source

with

automatic

crossover

or

as

a

constant

current

source.

Jumpers

are

connected

at

the

factory

as

shown

in

figure

3.

Take

care

to

remove

the

appropriate

jumpers

for

load

re-

quirements

that

need

different

supply-load

connections.

Refer

to

the

connection

diagram.

4.

Turn

OUTPUT VOLTAGE

control

knobs on

the

(M)

unit

to

the

desired

voltage

setting,

~nd

turn

the

output

voltage

controls

on

the

(S)

unit

to

fully

CCW

position~

5.

When

current

to

the

load

must

be

limited

to

an

intermediate

point,

turn

the

CURRENT LIMITER

controls

on both

the

(M) and

(S)

units

to

the

desired

current

limit

setting.

Set

current

limit

control

on

the

(M) and

(S)

units

to

the

position

indicating

the

current

value

to

be

delivered

by

the

respective

unit.

If

no

intermediate

.

current

limit

is

desired,

turn

the

controls

CW

on

both

(M) and

(S)

units

to

the

position

for

full

rated

current

for

the

maximum

ambient

temperature

of

operation.

Refer

to

section

on

Specifications

and

Features.

6.

Apply

AC

power

to

each

supply.

7.

Place

power

ON-OFF

switches

. on (M) and

(S)

units

in

ON

position

and

check

that

red

power

ON

indicators

are

lit.

8.

Check

that

output

current*

and

output

voltage

meters

on

both

(M)

and

(S)

units

indicate

desired

values;

as

required,

adjust

OUTPUT VOLTAGE

controls

and CURRENT

LIMITER

controls

on

(M)

unit

to

obtain

correct

meter

indications.

For

non-metered

models

use

externally

connected

meters

and

check

that

correct

meter

indications

exist

at

14

IM-LP400

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·•

output

terminals

4

and

6

of

the

(M}

tmit,

or

at

front

panel

jacks

(+)

arid (

-)

of

the

(M)

tmit

for

voltage

check

only;

for

remote

sensing

connection,

check

at

the

load

termination

of

sensing

leads

on

terminals

3

and

7

of

the

(M)

unit.

*

An1meter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5

rna.

point

as

zero

point.

9.

Power

supplies

are

now

in

proper

operation.

Parallel

Connection

Constant

Current

Operation,

With

Voltage

Limit

1.

Remove

Ac

power

input

to

each

suppl

y

and

place

power

ON-OFF

switch

on

both

(M)

and

(S)

tmits

in

OFF

position

before

connecting

load

to

the

supplies.

2.

Determine

load

requirements,

select

wire

size

from

figures

1

and

2

and

con-

nect

load

to

the

supplies

as

shown

in

figure

8.

Refer

to

paragraph

on

Connections

for

Parallel

Operation.

3.

Turn

the

CURRENT

LIMITER

control

knobs

on (M)

unit

to

the

desired

current

setting.

Turn

OUTPUT

VOLTAGE

control

knobs on

the

(S)

unit

to

full

CCW

position.

NOTE: When

setting

the

CURRENT

LIMITER

knobs

on

the

(M)

and

(S)

units

take

care

to

set

the

control

so

that

each

unit

indicates

the

proportion

of

total

current

that

the

tmit

must

suppl

y.

4.

When

load

voltage

must

be

limited,

turn

OUTPUT

VOLTAGE

control

knobs on

the

(M)

unit

to

the

desired

voltage

limit

setting.

If

no

voltage

limit

within

rating

of

the

supply

is

desired,

turn

controls

on

the

(M)

unit

to

the

full

CW

position.

5.

Apply AC

power

to

each

supply.

6.

Place

power

ON-OFF

switches

on (M)

and

(S)

units

in

ON

position

and

check

that

red

power

ON

indicators

are

lit.

7.

Check

that

output

current*

and

output

voltage

meters

on

both

units

indicate

desired

values;

adjust

OUTPUT

VOLTAGE

controls

and

CURRENT

LIMITER

controls,

as

required,

to

obtain

correct

indications.

For

non-metered

models

use

externally

connected

.

meters

and

check

that

correct

meter

indications

exist

at

output

terminals

4

and

6

of

the

(M)

unit,

or

at

front

panel

jacks

(+)and(-)

of

the

(M)

unit

for

voltage

check

only.

*Ammeter

indicates

a

nominal

5

milliamperes

offset

from

zero,

which

is

the

sensing

divider

current

and

not

load

current.

For

load

current

use

the

5

rna.

point

as

zero

point.

8.

Power

supplies

are

now in

proper

operation.

OPERATION

AFTER

PROTECTIVE

DEVICE SHUTDOWN

Thermostat

Shutdown

The

thermostat

opens

the

input

circuit

only

when

the

temperature

of

the

transformer

exceeds

a

maximum

safe

value.

The

thermostat

will

automatically

.reset

when

the

temper-:-

IM-LP400

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ature

of

the

transformer

decreases

to

safe

operating

value.

Mter

eliminating

the

cause(s)

for

overheating

and allowing

time

for

the

power

supply

to cool

to

a

proper

temperature,

resume

operation

of

the

supply.

Refer

to

appropriate

operation

paragraph

in

DETAILED

OPERATING PROCEDURES.

Fuse

Shutdown

Internal

component

failure

is

prevented

by

fuses

which

protect

the

components

from

damage

caused

by

excessive

currents.

Fuses

will

blow when the

maximum

rated

current

value

for

the

fuse

is

exceeded.

Fatigue

failure

of

fuses

can

occur

when

mechanical

vibra-

tions

from

the

installation

combine

with

thermally

induced

stresses

to

weaken

the

fuse

_

metal.

Many

fuse

failures

are

caused

by

a

temporary

condition and

replacing

the

blown

fuse

will

make

the

fuse

protected

circuit

operative.

When

the

LP

unit

is

used

with

the

over-

voltage

protector

option,

fuse

F2

will

provide

protection

against

internal

component

failure.

16

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