5.3.5. Home position settings

In the Application Settings Device configuration -> Home position

Home position settings window

Tab Home position sets the home position calibration parameters. Calibration comes to automatic accurate detection of the limit switch, the revolution sensor signal or moment of getting the external signal, which determines the zero position, and grading from it by a specified offset. It is helpful when the current location of the stage is unknown but we know the base point position relative to limit switch or some other signal, which is called home position.

Homing comes to the motor movement towards the predetermined 1st move direction (left or right) at Working speed until the signal from the source stop after don't happen. Then the motor movement towards the opposite direction with the same speed until the signal from the source stop after in the active state and continue half turn in the same direction. Then begins the precise movement in a given direction 1st move direction at 1st move speed. The speed is usually set low enough to keep the next signal. Motor stops, depending on the stop after value, upon getting a sync input signal, signal from RPM sensor or reaching of the limit switch.

If the flag Use second phase of homing is checked the homing algorithm rotates the motor in a predetermined 2nd move direction (left or right) with the 2nd move speed.

If the flag Blind half turn is checked the motor ignores the end of the second phase signal during half a turn. It helps to set an unambiguous detection order for the sensors that have the first and the second movement phases signals close each other.

The third phase of homing is the absolute offset to the distance standoff.

The resulting point is called a home position. It is important that its location on the stage does not depend on the calibration starting point.

Use fast homing algorithm option uses Working speed (see Settings of kinematics (stepper motor) page) for the first phase of homing to speed up the process.

Configuration commands are described in the Communication protocol specification section.