APC AP7602 User Manual download pdf (Page 9)

US

8,541,906

B2

5

or

through

associated

branch

outputs

or

outlets,

e.g.,

46.

Each

such

outlet,

e.g.,

46,

includes

an

output

line

50

grounded

to

the

housing

12

(not

shown

in

FIG.

4).

A

standard

electrical

supply

input

plug

(not

shown)

can

then

be

inserted

in

any

of

the

output

receptacles,

e.g.,

46,

and

thereby

receive

associ

ated

phase

power,

e.g.,

A,

from

power

supply

36

supporting

the

output

receptacle

46.

Each

power

supply,

e.g.,

A

(36),

includes

circuitry

that

converts

received

phase

power

to

5

volt

direct

current

(“VDC”)

and

distributes

the

5

VDC

to

an

associated

digital

display

module

26.

The

power

supply

36

circuitry

also

(i)

senses

the

magnitude

of

the

total

phase

A

current

?owing

through

the

power

supply

36

to

the

fourteen

power

output

receptacles,

e.g.,

46,

supported

by

the

power

supply

36,

(ii)

converts

the

total

phase

A

current

magnitude

to

an

0-5

VDC

analog

signal

representing

the

RMS

of

such

total

phase

A

current

magnitude,

and

(iii)

transmits

the

analog

signal

to

the

digital

display

module

26.

The

digital

display

module

26

thereby

displays

the

RMS

phaseA

to

phase

B

current

value

so

that

this

value

is

visible

to

a

user

viewing

the

display

module

26

on

the

housing

12.

The

digital

display

module

26

also

includes

an

audio

alarm

and

generates

an

audible

alarm

when

the current

value

exceeds

a

preset

level.

In the

preferred

embodiment,

the

audio

alarm

is

set

to

trigger,

via

jumpers

set at

the

factory,

at

20

or

30

amps

and

for

overload,

with

a

differing

audio

alarm

at

31

amps.

With

reference

now

to

FIG.

2,

the

preferred

three-phase

wye

power

distribution

and

monitoring

apparatus,

generally

60,

is

con?gured

much

like

the

delta

power

distribution

and

monitoring

apparatus

of

FIG.

1.

The

wye

apparatus

60,

how

ever,

also

includes

a

neutral

line

current

display

and

alarm

62

mounted

in

the

elongated

faceplate

64

on

the

housing

or

enclosure

66

and,

as

shown

in

FIG.

3,

includes

a

neutral

power

supply

68,

a

three-phase

wye

power

input

cord,

69,

and

differing

wiring

among

these

components

and

the three

power

supplies:

A

(70),

B

(72),

and

C

(74).

In

this

wye

embodiment

60,

the

power

input

cord

69

has

phase A,

B,

and

C

lines,

a

neutral

line

71,

and

ground

line

73.

The

ground

line

73

is

grounded

to

the

housing

through

the

terminal

block

75,

and

the

neutral

line

71

is

connected

through

the

terminal

block

75

to

the

neutral

power

supply

68.

Power

supply

A

(70)

is

connected

through

terminal

block

75

to

line

A

and,

through

the

neutral

power

supply

68,

to

the

neutral

line

71.

Power

supply

B

(72)

is

connected

through

terminal

block

75

to

Line

B

and,

through

the

neutral

power

supply

68,

to

the

neutral

line

71.

In

turn,

power

supply

C

(74)

is

connected

through

terminal

block

75

to

Line

C

and,

through

the

neutral

power

supply

68,

to

the

neutral

line

71.

Power

supply

A

(70)

therefore

receives

phase

A

to

neutral

voltage;

power

supply

B

(72)

receives

phase

B

to

neutral

voltage;

and

power

supply

C

(74)

receives

phase

C

to

neutral

voltage.

The

neutral

power

supply

68

also

is

connected

through

the

terminal

block

75

to

the

phase

A

line.

The

neutral

power

supply

68

includes

circuitry

that

converts

received

phase

A

power

to

5

volt

direct

current

(“VDC”)

and

distributes

the

5

VDC

to

an

associated

neutral

line

digital

display

module

62.

The

power

supply

68

circuitry

also

(i)

senses

the

magnitude

of

the

total

neutral

line

current

if

any

net

neutral

line

current

exists

(in

a

perfectly

balanced

system,

there

is

no

net current

in

the

neutral

line),

(ii)

converts

the

neutral

line

current

mag

nitude

to

a

0-5

VDC

analog

signal

representing

the

RMS

of

such

neutral

current

magnitude,

and

(iii)

transmits

the

analog

signal

to

the

neutral

line

digital

display

module

62.

The

digital

display

module

62

thereby

displays the

neutral

line

current

value

so

that

this

value

is

visible

to

a

user

viewing

the

neutral

line

display

module

62

on

the

housing

faceplate

64.

The

neutral

line

digital

display

module

62

also

includes

an

20

25

30

35

40

45

50

55

60

65

6

audio

alarm

and

generates

an

audible

alarm

when

the current

value

exceeds

a

preset

level,

as

describe

above.

Alternatively

or

in

addition,

the

digital

display

module

62

can

include

a

differing

sensory

alarm

when

the current

exceeds

or

falls

below

a

predetermined

level

or

range

of

values.

In

the

preferred

embodiments,

each

power

supply,

e.

g.,

70,

includes

current

distribution

lines,

a

module

for

converting

alternating

current

to

direct current,

a current

sensing

trans

ducer,

and

a

processor

for

converting

analog

output

from

the

current

sensing

transducer

to

a

digital

output.

Each

digital

display

module,

e.g.,

62,

includes

a

two

digit

LED

indicator,

an

alarm

buzzer,

and

a

processor

that

generates

an

alarm

when

the current

exceeds

the

factor

pre-set

level

as

explained

above.

These

power

supply

70

and

digital

display

module

62

components

are

assembled

in

a

fashion

well

known

to

those

skilled in

the

art.

Both

the

delta

and

the

wye

power

distribution

and

moni

toring

apparatus

of

FIGS.

1-4

may

be

adapted

to

provide

or

be

implemented

in

conjunction

with

remote

power

management

and

reporting

systems.

Apparatus

and

systems

for

doing

so

are

disclosed

in

references

such

as:

(i)

US.

Pat.

No.

5,506,

573,

entitled

Remote

Sensor

and

Method

for

Detecting

the

On/Off

Status

of

An

Automatically

Controlled

Appliance,

issued

to

Ewing

et

al.

on

Apr.

9,

1996;

(ii)

US.

Pat.

No.

5,949,974,

entitled

System

for

Reading

the

Status

and

for

Controlling

the

Power

Supplies

of

Appliances

Connected

to

Computer

Networks,

issued

to

Ewing

et

al.

on

Sep.

7,

1999;

and

(iii)

the

applicant’s

U.S.

co-pending

application

entitled

“Network

Remote

Power

Management

Outlet

Strip,”

Ser.

No.

10/313,314,

?led

Dec.

6,

2002,

the

disclosures

ofall

ofwhich

references

are

hereby

incorporated herein

by

reference

in

their

entireties.

It

can

thus

be

seen

that

the

applicant

has

provided

a

polyphase

(and

in

the

preferred

embodiments,

three-phase)

power

distribution

and

monitoring

apparatus

that

preferably

provide

a

clear

but

self-contained,

unobtrusive,

and

space

saving

power

monitor

for

each of

multiple

power

phases

and,

if

desired,

the

neutral

line

in

the

case

of

a

wye

connected

three-phase

power

supply

system.

In

this

regard,

in

this

speci

?cation

the

term

“monitor”

means

a current

display

or

other

sensory

indicator,

such

as

an

audible

or

other

sensory

alarm,

mountable

on

or

to

the

housing

of

the

power

distribution

and

monitoring

apparatus.

The

preferred

embodiments

also

are

relatively

portable,

lightweight,

slim,

economical,

and

easy

to

manufacture,

install,

use,

and

maneuver.

One

skilled

in

the

art

may

readily

adapt

other

polyphase

power

supply

systems

to

provide

novel

features

of

the

types

disclosed

herein,

such

as,

for

example,

on-site

current

dis

plays

and

alarms

for

each

phase

or

other

line

in

the

power

supply

system.

The

present

invention

is

therefore

not

neces

sarily

limited

to,

for

example,

three-phase

systems

by

the

detailed

description

of

preferred

embodiments

set

forth

above.

What

is

claimed

is:

1

.

A

polyphase

alternating

current

power

distribution

appa

ratus

connectable

to

one

or

more

electrical

loads

in

an

elec

trical

equipment

rack

comprising,

in

combination:

a

vertical

rack-mountable

housing;

a

polyphase

power

input

disposed

in

the

vertical

rack

mountable

housing;

a

plurality

of

power

outputs

disposed

on

a

face

of

the

vertical

rack-mountable

housing,

with

at

least

one

power

output

being

in

power

supply

communication

with

a

?rst

power

phase

provided

by

the

polyphase

power

input

and

at

least

a

second

power

output

being

in

power

supply

communication

with

a

second

power

phase

provided

by

the

polyphase

power

input;

and

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