Emerson FM-3 Manual de instalación descargar pdf (Pagina 113)

Parameter Descriptions

This section lists all programmable and feedback parameters available. The parameters are listed

alphabetically by variable name on the right and give a description. Range is dynamic and depends

on User Unit scaling. The units of the parameters are dynamic and depend on selected User Units.

Absolute Position Valid AbsolutePositionValid

This source is activated when either the DefineHome destination is activated, or any home is

successfully completed (sensor or marker found). This source is deactivated if the drive is

rebooted, an encoder fault occurs, the drive is powered down, or a home is re-initiated.

Accelerating Accelerating

This source is active when the FM-3 is executing an acceleration ramp. A normal index

consists of 3 segments: Accelerating, At Velocity, and Decelerating. The Accelerating source

will be set (active) during this acceleration segment regardless of whether the motor is

speeding up or slowing down. Therefore, this source can sometimes be active when the motor

is decelerating. This could be true when compounding indexes together.

Acceleration Type AccelType

This parameter is used to select the accel/decel type for all motion (homes, jogs and indexes).

The “S-Curve” ramps offer the smoothest motion, but lead to higher peak accel/decel rates.

“Linear” ramps have the lowest peak accel/decel rates but they are the least smooth ramp

type. “5/8 S-Curve” ramps and “1/4 S-Curve” ramps use smoothing at the beginning and end

of the ramp but have constant (linear) accel rates in the middle of their profiles. The “5/8 S-

Curve” is less smooth than the “S-Curve” but smoother than the “1/4 S-Curve”. S-Curve

accelerations are very useful on machines where product slip is a problem. They are also

useful when smooth machine operation is critical. Linear ramps are useful in applications

where low peak torque is critical. Below is a comparison of the 4 ramp types:

• S-Curve: Peak Accel = 2 x Average Accel

• 5/8 S-Curve: Peak Accel = 1.4545 x Average Accel

• 1/4 S-Curve: Peak Accel = 1.142857 x Average Accel

• Linear: Peak Accel = Average Accel

Acceleration Decimal Places AccelUnits.Decimal

This parameter is the decimal point location for all real-time accel./decel. ramps.

FM-3 Programming Module Reference Manual

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Emerson FM-3 Manual de instalación Pagina 113