Emerson Epsilon EP Drive 400518-01 Manual de instalación descargar pdf (Pagina 53)

Setting Up Parameters

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

If the user decides to put a 5:1 reducer on the system, the user simply needs to change the Characteristic Length.

Now the belt travels 4.71" in 5 motor revolutions.

Keep in mind that the characteristic length is always a whole number and the valid range is from 1 to 2000.

Note

User Units may affect end motor speed and could cause trajectory faults.

Because of internal math in the FM-3/4 module and Epsilon EP-P drive, some user unit combinations may cause module or

drive trajectory faults. The maximum motor velocity allowed by the drive is detailed under the distance section of the User

Units View and is labeled “User Unit Limited Speed”. When the user unit setup is altered in such a way that the maximum

motor speed allowed by the drive is less than the maximum speed allowed by the chosen motor, the readout of maximum

motor speed allowed by the drive changes to have a red background. If a configuration is downloaded to the device with a

red background on the “User Unit Limited Speed”, the drive will obtain a trajectory fault at speeds near this velocity. To

alleviate this issue, simply remove decimal places from your user units, and/or change the characteristic distance (numerator)

of your scaling parameters to be a smaller number that it was. The red background indicating trajectory faults will go away

when the user unit setup is scaled for a realistic accuracy based on the encoder counts per revolution.

Velocity Group

Enable Separate Distance Units Check Box

If selected (enabled), separate distance and velocity units, name and scaling will be enabled. If not enabled, the velocity units,

name and scaling will be defined by the Distance Group.

Scaled Distance Name

If the user wants the velocity units to have a different distance scaling than the distance units a name can be entered here up

to 10 characters. For example, the user distance units name could be inches while the velocity units name is feet per minute.

Velocity Distance Units Scale Factor

This parameter scales the Velocity Distance Units back to actual distance units. To do this, enter the number of distance user

units that are equal to one velocity scaled distance unit.

Separate Distance Units Example:

A user has an application using a leadscrew with a 0.5"/turn lead. The user wants to have Distance Units of Inches, but wants

Velocity Units of Feet so motion can be programmed in feet/minute.

Scaling

Characteristic Distance = 4.712

Characteristic Length = 1

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Scaling

Characteristic Distance = 4.712

Characteristic Length = 5

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Emerson Epsilon EP Drive 400518-01 Manual de instalación Pagina 53

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Emerson Epsilon EP Drive 400518-01 Manual de instalación Pagina 53

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