5
Commissioning
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Festo – GDCP-CMMO-ST-EA-SY-EN – 2017-05c – English
5.4.4
Executing a homing run
During initial start-up of an actuator, also execute a homing run to determine the homing point. The
reference point is saved temporarily in the motor controller. When there is an open circuit in the logic
power supply, the homing point is lost and the homing run must be repeated. The required settings for
the dimensional reference system and the homing run are made on the parameter page of the FCT
[...][Axis][Homing].
To perform the homing run:
Select low search/creep speed to enable the target points to be identified as accurately as pos
sible.
Set deceleration high enough to prevent the target points from being overrun during the search run.
For control with valve profile, the automatic homing run function can be enabled with FCT.
(
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Tab. 2.25). In delivery condition, automatic running of the homing function is disabled.
Further information about homing:
– Dimensional reference system
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– Homing
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Requirements:
– The actuator is completely configured.
– The dimensional reference system is parameterised
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FCT [...][Axis][Measurements].
– Homing has been parameterised
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FCT [...][Axis][Homing].
– When homing on reference switch:
– The inputs for the reference switch are enabled.
– The type of switch used is configured correctly in the FCT
– All parameter settings were transferred with FCT <Download> to the controller.
Carry out homing run and test run:
1. Enabling via FCT
2. During initial start-up: check functionality of the actuator
Move actuator manually in both directions (
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FCT online tab “Manual Move” ).
Check direction of rotation/direction of travel of the electromechanical actuator.
Optional: enable reversal of direction of rotation (
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FCT [...][Application Data][Environment]).
Check signal characteristics of the digital I/O (e.g. reference switch).
3. Start homing run (
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FCT online tab “Homing” ).
Following successful completion of homing, the actuator is referenced to the dimensional reference
system.
4. For initial start-up: perform a test run (
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FCT online tab “Manual Move” ).
Move actuator in both directions with <Single Step.> or <Jog>.
Check displayed positions of the axis.
Move to the limits of the positioning range and check the software end positions.