Continental Electronics 816R - Power Controller Checkout Procedure

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CONTINENTAL

816R

and

COLLINS

831G

POWER

CONTROLLER

CHECKOUT

A.

PRELIMINARY

1.

Remove

primary

power

from

the

transmitter

and

ground

high

voltage

supply

components.

2.

Remove

the

Thyrectors

(Voltage

Absorbers

CR1-CR5,

not

used

of

recent

transmitters)

that

may

be

in

parallel

with

the

High

Voltage

Inductor

LI.

NOTE:

The

following

tests

will

apply

single

phase

voltages

to

the

RF

Tube

Power

Supplies.

Failure

to

remove

the

Thyrectors

will

result

in

damage

to

the

Thyrectors

across

the

High

Voltage

Inductor

LI.

3.

Locate

the

Power

Controller

Assembly

A9AR1

at

the

top

of

the

transmitter

center

cabinet.

The

Power

Controller

is

accessible

from

the

rear

center

cabinet

on

all

Continental

and

some

late

model

Collins

Transmitters.

On

older

model

Collins

Transmitters,

the

Power

Controller

is

accessible

from

the

front

of

the

Center

Cabinet.

Use

the

following

procedure

to

gain

access

to

the

Power

Controller

on

older

model

Collins

Transmitters

only:

Remove

the

Control

Panel

and

set

it

on

top

of

the

transmitter.

Remove

the

screws

that

secure

the

Card

Cage

Assembly

and

move

the

Card

Cage

Assembly

forward

just

enough

so

that

the

Gating

Cards

can

be

removed.

B.

TEST

PROCEDURE

1.

Remove

two

of

the

three

Gating

Cards

from

the

A9AR1

Assembly.

2.

Restore

the

primary

power

to

the

transmitter

and

turn

FIL

ON.

3.

Place

Transmitter

in

MANUAL

POWER

CONTROL

and

after

the

time

delay

has

expired,

turn

PLATES

ON.

The

transmitter

plate

and

screen

power

supplies

will

be

operating

with

only

one

power

phase

applied

in

the

following

tests.

The

plate

voltage,

screen

voltage,

and

power

output

will

be

lower

than

usual.

It

is

not

important

what

the

exact

voltages

are

in

these

tests.

5.

Operate

POWER

CONTROL

ADJUST

and

observe

that

the

plate

voltage,

plate

current

and

power

output

change

smoothly.

Note

the

maximum

plate

voltage.

If

the

Power

Controller

Phase

under

test

is

good,

there

should

be

no

breaker

trips,

no

unusual

noises

form

the

power

transformers

and

no

building

lights

blinking.

WARNING:

Remove

primary

power

from

the

transmitter

each

time

a

gating

card

is

moved

or

changed.

If

none

of

the

cards

operate

properly

in

the

selected

Power

Controller

receptacle,

use

a

different

card

receptacle

and

run

the

test

again.

Perform

the

same

test

with

each

(one

at

a

time)

of

the

remaining

gating

cards

in

the

same

Power

Controller

card

receptacle.

You

should

get

exactly

the

same

results

with

each

card

if

the

card

is

good.

If

all

the

cards

operate

properly,

use

one

of

the

cards

to

test

each

of

the

two

remaining

receptacles.

This

will

check

the

other

two

Power

Controller

phases.

If

all

the

cards

operate

properly

in

one

or

two

receptacles

but

not

in

another,

you

can

safely

assume

that

the

cards

are

good

but

either

an

A9AR1

control

transformer

or

one

of

the

SCR

banks

are

defective.

Our

experience

indicates

that

the

SCR's

are

least

likely

thing

to

fail.

28