Section 3 Flashcards
._____ is the movement of the load by the actuator as it attempts to follow a changing command signal in a motion – control system.
tracking
A leadscrew mechanism converts __ ___ motion into __ ___ motion.
rotary to linear
List three factors that impede acceleration or deceleration.
friction
inertia
gravity
List three devices that are used to enter data into an operator interface device.
keyboard terminal
thumb wheels
switch panels
A common application of a _____ is to run a conveyor belt.
belt drive
The direction that the housing of a rolling ring drive moves is determined by the_____ .
direction rings are pitched
Which of the actuator transmission systems are capable of multiplying rotary speed from the input shaft to the output mechanism?
choose all that apply
not belt drive?
JUST Gear box
not rack and pinion
direct drive
leadscrew
The_____ is self-breaking, which enables it to hold a load in a stationary position .
worm and wheel
List the five major elements of a closed-loop motion-control system.
Operator interface Controller Amplifier Actuator Feedback
An inductosyn measures __ __ motion.
linear
A hydraulic actuator is a ___ device.
linear or rotary
AC drives perform the operation of which element in a motion-control closed-loop system?
Choose all that apply
everything but the actuator
The load movement lagging behind the desired movement specified by the command signal is called___.
following error
An open-loop configuration considered a servo system
is NOT
The direction at which the object being measured moves in relation to the housing of a linear
polarity of produced voltage
Convert Gray code number 1000 to an equivalent binary number.
to convert from grey to binary
you drop most sigbit and XOR with that bit and next but
1111
The number of degrees per count in an incremental optical encoder is called _____.
resolution
Which of the following parameters is measured by a tachometer?
chose all that apply
RPM
AND
Direction
A one-track incremental encoder is capable of measuring direction.
F
The Wiedemann effect is a _____ action caused by the interaction between two magnetic fields
twisting
Which of the following parameters is measured by the optical encoder?
all provided answers
Which of the following parameters is measured by a resolver?
all answer
An advantage of an absolute optical encoder is that if power is lost and then restored, it is
not necessary to re-establish a reference point.
true
wire rope transducer uses _____ to measure velocity
tachometer
List two ways an incremental optical encoder can measure velocity.
measuring time interval between pulses
or counting pulses within a time period
Where is the rotor positioned over the sections of the receiving board when the angular displacement
transducer produces 0 volts?
The rotor is positioned equally across the two sections of AB and CD with an equal area
The operation of an inducrosyn is similar to that of a resolver.
TRUE
What is the function of the Schmitt trigger in an optical encoder?
convert pulses from phototransistor into sqaure waves
Logic circuits that convert binary numbers to gray code, or vice versa, use _____ gates.
XOR
The best type of position device to use in conditions where there is extreme heat, humidity, and
dirt is the _____ .
NOT pot
resolver
It is possible to correct an underdamped condition of a position servo by the system gain.
decreasing
The characteristics of a servomechanism pertain to the condition of the load when it is moving.
dynamic
When equilibrium is reached in a servo system, the error signal becomes zero.
position
A current loop in a position-control application has a bandwidth.
HIGH
In a closed-loop velocity servosystem with a tachometer, if the load slows the motor down, the error signal (increases, decreases).
increases
A bang-bang position servo is used in applications.
hi speed
A _____ provides a better braking action in a point-to- point position system.
derivative
In the figure What is the purpose of the three exclusive-OR gates?
converting grey code to binary
The linear motion-control feedback transducer used by the electrohydraulic system in the Figure is a(n)_____
LVDT
Feed-forward the following error signal in a position servosystem.
decreases
Another term for speed regulation of a closed-loop velocity control system is _____.
stability
In a slow-moving contouring application, the _____ mode provides high stiffness during travel.
NOT derivative
integral
A position servo has a zero bandwidth.
proporitonal
List the four types of static characteristics.
accuracy
Response
Repeatbiolit
Stiffness
In Figure 26-8, the LVDT produces a voltage that is the polarity as the output of the D/A converter.
opposite!
Indexers perform the operation of which element in a motion-control closed-loop system?
CONTROLLER
Which of the following parameters primarily maintain speed regulation?
velociy control
In an XYZ system, if two axes movements control horizontal position, which axes controls the vertical position?
Z
Linear measurements can also be made by Rotary detectors.
TRUE
The actuator of a/an _____-loop system is activated when the command signal or a disturbance occurs.
clsoed
A potentiometer is considered a precision measuring device.
true
A potentiometer is capable of measuring velocity.
false
The _____ of an LVDT is physically attached to the object being measured for position.
iton core
5 bit grey code can divide into
32 at 11.25 degrrees
The linear velocity transducer produces a voltage that is _____ proportional to the speed of the magnet.
directly
Assuming that the system gain of a position servo remains unchanged, the transient response time if the load inertia is decreased.
increase
If a master axis slows down on a rewinder paper machine in a master–slave velocity servo, it is likely that the slave axis will
speed up
The following error in a contouring position control application is .
minimal
List the two ways in which gain adjustments can be made when tuning a servosystem.
potentiamoter or
value picked from software
When a setpoint command signal is held constant and the motor that the system is driving is rotating at a steady speed, the _____ amplifier output is zero.
derivative
A decelerating braking action called _____ prevents the load in a position servo from overshooting its end point.
damping
When input A of the magnitude comparator is less than input B, the motor turns.
CCW
A rack-and-pinion transmission system converts __ ___ motion into __ __ motion.
rotary
;inear
lA feedback potentiometer is a linear feedback device.
TRUE
The LVDT uses transformer action to measure position
true
In the Figure, if the setpoint potentiometer applies +7 V to the summing op amp when the feedback potentiometer applies –12 V to the other summing amplifier input, the rack will move _____
Right
