Control Techniques FM-3, Reference Manual

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15
Operational Overview
Home Limit Distance
This parameter places an upper limit on the incremental distance the motor will travel during
the home.
If no reference is found, the system will decelerate and stop at the limit distance. The Home
Limit Distance Hit function will be activated if the home stops at the limit distance without
finding the reference. Additionally, the Home.CommandComplete function will not turn
“On” if the limit distance is hit.
Home Examples
Example 1: Linear Application
In this example, the system uses an external sensor and the motor’s encoder marker channel
to establish a Home Reference Position. This is the most accurate and most common way to
home.
Figure 16: Home to Sensor and Marker, Example
When the FM-3 module sees the Home Initiate, it accelerates the motor to the Home Velocity.
The motor continues at that velocity until it first senses the Home Sensor input. It continues
at the same velocity until the motor’s encoder marker channel is sensed. The rising edge of
the motor’s encoder marker channel is used to establish the reference position. Once the
home reference is detected, the motor decelerates to a stop and moves to the offset position.