Emerson Epsilon EP Drive 400518-01 Manual de instalación Pagina 21

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9
Operational Overview
Figure 11: Sensor then Marker Home Reference Position Example 2
The Home Sensor must be “On” for at least 800 µsec to guarantee that it will be recognized.
Figure 12: Sensor then Marker Home Reference Position Example 3
Home Offset
The Home Offset is the distance from the Reference Position to the final stopping point at the end of the homing sequence.
Regardless of the value you enter for the Offset or which Home Reference type you choose, there is always an offset inherent
in the homing process.
The user may either specify a desired offset or allow the drive to calculate an offset automatically. The drive calculates an
offset that guarantees that the motor will not have to backup to get to the offset position. This is very convenient for
unidirectional applications.
The Calculated Offset is the distance travelled during deceleration ramp from the home velocity to a stop plus the distance
travelled at the home velocity for 800 usec. This extra distance is used to guarantee that the motor will not need to backup
after the deceleration ramp.
The Specified Offset allows the user to choose an exact offset from the Home Reference.
Once the home reference is detected, the device will do whatever is necessary to reach the offset position. This may be as
simple as a deceleration to a stop, a continuation at speed followed by a deceleration to a stop, or a deceleration followed by
a move in the opposite direction.
To enter a specified home offset, select the Specified Offset radio button. PowerTools Pro always displays the calculated
offset value as a reference. If the home reference is detected before the axis has reached its peak velocity, the axis will still
continue to the precise offset position.
Marker
Sensor
>800 µsec
Direction of Travel
800 µsec
Sensor
Sensor Min.
On Time
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