Specifications

Page 5

HOW THE CONTROL WORKS

CS24-Series controls monitor distance between a sensor and a target by echo-

location, the same principle that bats and porpoises use to nd their way in the

dark. The sensor emits a burst of high-frequency sound (50 to 60 kHz.) varying

from 15 to 82 times per second. (Rate depends on target distance.) This burst is

actually a controlled sequence of four separate frequencies. After each burst the

control measures how long it takes until the sensor picks up the echo. Because

sound travels at a known speed, distance equals time.

The control senses the distance to a target,

but it can’t tell what that target is. A useful

control must have a limited range of “vision”.

It should see only the thing that we want to

control, and that thing should exist as a

target within known limits. If the control sees beyond those limits,

the oor may confuse it, or the wall, or ceiling. The Figure at the

right shows the Range concept and explains the terms used in this

manual. You always know when the sensor detects a target within

the control range. The alignment light on the front glows green. If

the light is red, there is no target within the control range.

The microprocessor performs calculations that relate target dis-

tance and time to an analog or digital control signal. Loop control

is the primary application for CS24 Series controls. The control

monitors the loop of strip material between processing stations

and automatically matches the speed of one process to another.

It controls either the PAYOUT or the TAKEUP process by keeping

the drape of material constant. The program contains the control

algorithms necessary to stabilize the control process. The control

can synchronize takeup and payout to iterative processes (run/stop)

so that the equipment runs continuously at the right speed rather

than bumping on and off. The same signals can be used to perform

other control functions such as:

Control of winding and payoff tension by diameter

measurement.

Controlling levels of liquids, solids, or stacked materials.

Position control and contour measurement.

coiltek

Base Distance

13” Minimum

Control

Range

Lower Set Point