Magnavox W-10CR Installationsanleitung PDF herunterladen (Seite 317)

Glossary 301

DEVICE ADDRESS - A unique number used to assign

which Motion Controller in a multi-drive stepper system

is to respond to commands sent by a host computer or

terminal. Device addresses from 1 - 9 are set by means

of the ID # select switch. "0" is reserved to address all

Motion Controllers in a system. Factory default is 1.

DWELL - See "WAIT".

ELECTRICAL HOME - The motor commanded posi-

tion is zero (the Absolute Position register

is zero).

FEEDRATE - The speed or velocity (in units per sec-

ond) at which a move will occur.

FRICTION - Force that is opposite to the direction of

motion as one body moves over another.

FULL-STEP - Position resolution in which 200 pulses

corresponds to one motor revolution in a 200 step per

revolution (1.8 degree) motor.

HALF-STEP - Position resolution in which 400 pulses

corresponds to one motor revolution for a 200 step per

revolution (1.8 degree) motor.

HANDSHAKE - A computer communications technique

in which one computer's program links up with an-

other's. The Motion Controller uses a software "Xon,

Xoff" handshake method. See "XON" below.

HOST - The computer or terminal that is connected to

the HOST serial port on the motion controller, and is

responsible for primary programming and operation of

the controller.

INCREMENTAL MODE - Motion mode in which all

motor movements are specified in reference to the

present motor position.

INDEXER - A Microprocessor-based programmable

motion controller that controls move distance and

speeds; possesses intelligent interfacing and input/output

capabilities.

INDEX FROM RUN – See Mark Registration.

INERTIA - Measurement of a property of matter that a

body resists a change in speed (must be overcome

during acceleration).

INERTIAL LOAD - A "flywheel" type load affixed to

the shaft of a step motor. All rotary loads (such as gears

or pulleys) have inertia. Sometimes used as a damper to

eliminate resonance.

INSTABILITY - Also frequently called, "mid-range

instability" or "mid-range resonance," this term refers to

a resonance that occurs in the 500 - 1,500 steps/sec

range. Mid-range instability is important because it

refers to a loss of torque or a stalled motor condition at

higher stepping rates. Since step motors do not start

instantaneously above the mid-range resonance fre-

quency, an acceleration scheme will have to be used to

pass through the troublesome region.

JOG MOVE - moves the motor continuously in a

specified direction.

LOAD - This term is used several ways in this and

other manuals.

LOAD (ELECTRICAL): The current in Amperes pass-

ing through a motor's windings.

LOAD (MECHANICAL): The mass to which motor

torque is being applied (the load being moved by the

system).

LOAD (PROGRAMMING): Transmits a program from

one commuter to another. "DOWNLOAD" refers to

transmitting a program from a host computer (where a

program has been written) to the Motion Controller

where it will be used. "UPLOAD" refers to transmitting

a program from a Motion Controller back to the host

computer.

MARK REGISTRATION - A motion process (usually

used in web handling applications) whereby a mark

placed on the material is sensed (e.g., through the use of

an optical sensor) and, following detection of this mark,

the material is moved (indexed) a fixed length.

MECHANICAL HOME - The position where a switch

input is used as a reference to establish electrical home.

MICROSTEPPING - A sophisticated form of motor

control that allows for finer resolution than full step (200

Pulses Per Revolution PPR) or half step (400 PPR) by

adjusting the amount of current being applied to the

motor windings. Microstepping up to 250 pulses per full

step (50,000 PPR on a 200 step/rev or 1.8 degree motor)

is supported. For 200 step per revolution motors, typical

microstepping levels are 1/10-step and 1/125 step (2000

PPR and 25,000 PPR, respectively). Note: this is a

DRIVE function.

MOVE TO MECHANICAL HOME - Function which

allows the Motion Controller to move the motor and seek

a switch to establish electrical home and set Absolute

Position = zero.

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