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Setting Up Parameters

Time Base

Selects the Time Base for the home move velocity and acceleration/deceleration. Real-time

and sync are the allowed selections.

Velocity

Sets the target velocity for the home. The polarity determines the home direction. Positive

numbers cause motion in the positive direction and negative numbers cause motion in the

negative direction in search of the home reference.

Acceleration

Average Acceleration rate used during the home. Units are specified on the User Units page.

Deceleration

This is the average Deceleration rate used at the end of the Home move in user units.

If on sensor... Group

These radio buttons determine how the system reacts if the Home.#.SensorTrigger is already

active when the home is initiated.

’Back off before homing’ Radio Button

If this radio button is set, the drive will back off the sensor before beginning the home. It does

this by moving the direction opposite to that specified by the sign of the home velocity. It

continues moving in this direction at the target home velocity until the sensor goes

deactivates. The motor then decelerates to a stop and performs a standard home.

’Go forward to next sensor’ Radio Button

If this radio button is set, then the system will ignore the sensor that is active when the home

is initiated, and move in the proper direction until the first low to high transition of the Home

Reference signal.

Home Offset Group

The Home Offset group has two buttons, the calculated Offset Radio Button and the Specified

Offset Radio Button.

Calculated Offset Radio Button

The calculated offset is defined as the distance traveled during deceleration ramp from the

home velocity to a stop plus the distance traveled at the home velocity for 1600µs. This extra

distance is used to guarantee that the motor will not need to backup after the deceleration

ramp.

Specified Offset Radio Button

The specified offset allows the user to choose an exact offset from the Home Reference point.

The commanded motion will stop at exactly the offset distance away from the reference point

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Emerson FM-3 Installationshandbuch Seite 83