Emerson FM-3 Instrukcja Instalacji Pobierz pdf (Strona 45)

Setting Up Parameters

Scaling

A Characteristic Distance and Length must be established to allow the FM-3 to scale user

units back to actual motor revolutions. This scaling factor is as follows:

Characteristic Distance

Scaling =>

Characteristic Length

Characteristic Distance

This is the distance the load travels (in user units) when the motor travels the characteristic

length (in motor revolutions).

Characteristic Length

This is the distance the motor travels (in whole number of revolutions) to achieve one

characteristic distance of load travel.

Distance Scaling Examples

A 1.5" diameter pulley is used to drive a conveyor belt, and the user wishes to use units of

inches instead of revolutions.

Units Name —> Set to Inches

Decimal Places —> Set to desired accuracy 0.000

In one revolution of the motor (or pulley), the belt will travel a distance of one pulley

circumference.

= 1.5" x π

= 1.5 x 3.14...

= 4.712 inches / revolution

Characteristic Distance = 4.712

Characteristic Length = 1

If the user decides to put a 5:1 reducer on the system, they simply need to change the

characteristic length.

Now the belt travels 4.71" in 5 motor revolutions.

Characteristic Distance = 4.712

Characteristic Length = 5

Keep in mind that the characteristic length is always a whole number and the valid range is

from 1 to 2000.

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 229 230

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Emerson FM-3 Instrukcja Instalacji Strona 45