Axis AX-906 Guía de usuario descargar pdf (Pagina 20)

76

AX

DRIVE

USER

GUIDE

STEP 4

STEP 4

ModeJ 72

(ThumbwheeJ)

Operation

Tuning Procedure

Cycle Power

or

enter

the

Z

command.

The

AX

will go

through

the

nonnal

XP9 mode operation.

In

XP9 mode,

the

AX

scans

the

sequence select

inputs

and

selects

and

executes

the

first

avallable valid

sequence

according

to

the

binaIy

value of

the

three

inputs

(see Table 4-2). After

the

sequence

is

executed,

the

inputs

are

again

scanned

to execute

another

sequence. The

AX

will

continue

to

execute

sequence

in

this

fashion

until

you

issue

an

S

or

a K

command,

or

if

an

end-of-travellimit

is

encountered.

To

run

sequence #1, ground sequence

inputs

1,2,

and

3

at

the

same

time

(refer

to

table

4-2 for

sequence

input

configurations

to

run

other

sequences).

The Model 72

and

Model

72-1/0

units

interface with

the

AX

Drive

via

an

RS-232C interface.

The

Model 72 provides

adjustable

thumbwheel

Switches

to

enter

and

change

AX

motion

control

parameters.

These

switches

allow

you

to

set

and

modify velocity, acceleration,

distance,

direction, dwell

time, loop

count,

and

other

parameters.

If

you

wish to

purchase

a Model

72

or

Model

72-1/0,

contact

your

Automated

Technology

Center

or

Compumotor

Distributor.

The

Model

72 User

Guide

contains

all

pertinent

information for

use

with

the

AX.

NOTE:

For

most

applications.

tuning

an

AX

Drive

to

a

motor

is

not

necessary.

Should

certain

aspects

of

the

systems

performance come

under

scrutiny

in

the

area

of velocity ripple,

resonant

frequencies

or

step-to-step

accuracy,

the

follOwing procedure

could

offer improved performance.

Velocity ripple

is

a

term

used

to

express

a variance of

angular

speed.

It

is

usually

expressed

as

a percentage of

the

commanded

velOCity.

This

is

due

to

the

mechanical

inaccuracies

of

the

motor

resulting

in

unequal

step

sizes.

It

can

also

be

enhanced

by

running

the

motor

at

its'

natural

freq1,lency

causing

resonance.

Adding solid

inertia

to

the

system

can

shift

or

modify

the

phenomenon

but

does

little

to

eliminate it.

If

your

system

can

handle

more

inertia, conSider

using

viscous

dampers.

A 10: 1 load

to

rotor

inertia

ratio

is

the

maximum

value

recommended.

To a

certain

extent,

adding

friction

to

the

system

can

actually

dampen

the

effects of

both

resonance

and

velocity ripple.

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