118Homing OperationCaution1) If any of the set values of the parameters below is “0”, an operation trips due to homing error protection(error code No. 68) and stops according to an operation at alarm occurrence.• 16.Pr30 (Homing speed (high))• 16.Pr31 (Homing speed (low))• 16.Pr33 (Homing acceleration setting)• 16.Pr34 (Homing deceleration setting)2) Also, if the over-travel inhibit input is enabled in an operating direction under any of the conditions belowduring homing, an operation trips due to homing error protection (error code No. 68) and stops accordingto an operation at alarm occurrence.• After the reversal due to detection of a limit sensor in a direction of homing, the change in the homesensor ON into OFF could not be detected and a limit sensor in the reverse direction, not in a directionof homing, has been detected.How to decelerate at the detection of a limit sensor depends on the settings of SV.Pr55 (Over-travelinhibit input operation setting). (For a set value = 0 or 2, deceleration-and-stop. For a set value = 1 or 3,stop in the deceleration time “0”.)3) We would like to ask you to design so that a sensor signal does not vary (beyond the sensor signal width)when the motor is decelerating after it detects the home sensor or limit sensor.4) In this system, delay time of a maximum of 2 ms is caused when detecting the home sensor (front end) atthe • part and, therefore, the home position varies to the extent of a maximum of homing speed (low)multiplied by 2 (ms).Home sensor + Z phase (based on the rear end)Example: Z phase count = 3 at an operation in a positive directionDetect the home sensor (at the front end) in a direction of homing by 16.Pr30 (Homing speed (high)), decel-erate to 16.Pr31 (Homing speed (low)), detect the home sensor (at the rear end) turning off, count the Zphase specified times by 16.Pr3B (Homing Z phase count setting) and define that point as a home position.(1) A starting point is between the home sensor and negative direction limit sensor (also on the negative direction limit sensor)Home sensorDirection of homingL-SPDL-SPDL-SPDH-SPDH-SPDH-SPD(2) A starting point is on the home sensor(3) A starting point is between the positive direction limit sensor and home sensor(4) A starting point is on the positive direction limit sensorL-SPDH-SPDPositive direction limit sensor Negative direction limit sensor
