Axis 670 Manual de instrucciones descargar pdf (Pagina 42)

6.1.7.2

Class

The object of this procedure is

bring the servo gain up slowly while maintaining contiol ofthe

scanners

all

times.

Move all the trimpots

small increments until experience with this system

is obtained. If at any time during this procedure

the

scanners start

move erratically and make

a loud buzzing noise, shut off the input power immediately

and

check

the

procedure

to see if

all

steps were followed properly.

6.1.7.2.1.

Coarse Tuning

Perform steps

section

4.2.

above.

hiitialize

all

tuning pots. Tum R25, R28,

R31

and

R59 counter-clockwise, CCW,

least

tums or until they begin to click. Do

not

touch

R107.

has been factory

set

and should

not

need adjusting

this time.

Tum R78

fully

CCW 15

tums. Ensure

Wl and W6 are

connecting pins

and 2.

Tum

R25,

R28 and

R59

2-3

fiill tiims

CW.

This should allow tiie scanner

center vkitii

slight amount

loop

gain once

the

power

applied.

also allows

the

input signal

pass

through

the

system,

so be

careful when tuming

power

step

below. Ensure

the

input

signal

set to a

voltage of O.Ovolts.

Attach

scope probe

to the

input signal

at W4 to

monitor

the

input signal.

Use the

rising

edge of this signal

as the

trigger source

for

the scope. Attach another scope probe

to TPl to

monitor the Position Output signal, VP.

Use TP2 or

W7.2

as the

ground reference

for

both

signals. Set the vertical gain to 0.2V/div

for

both channels on the scope.

Apply power to the system. The system should perform

its

normal tum-on sequence and both

scanners should center themselves. Check

the

voltage

at TPl to

ensure that

the

scanner

some^^iiat near the center ofthe field. (Within

volt.) If the scanner has

not yet

centered,

turn R25 and R28 CW

littie more while carefiilly watching

the

oscilloscope

for any

erratic

behavior. Ensure that

the

servo loop

slightiy

"stiff' by

attempting

move

the

mirror.

Touch

the

mirror only

by the

edges

avoid fingerprints.

The use of

finger cots

highly

recommended. When

the

servo

is stiff, the

nurror will resist slight efforts

move

it, and

center again when released. Once this is obtained, continue on to the next step.

**Caution!! If at this time

load buzzing

whining noise

heard from

the

scanners, shut

off

the power immediately.

Tum R28 CCW one

full

tum and try

applying power again.

If the

system

still

not

behaving well, start over

step

using less tums

for

step 3.

the

system

cannot be made to work, call Cambridge Technology

for

assistance.

6. Input

square wave input signal

at a

frequency

of 30Hz.

Set the

amplitude

produce about

2°

p-p of

scanner shaft motion.

The

exact amount

is not

important

long

as the

motion

small.

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Axis 670 Manual de instrucciones Pagina 42

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