Mitsubishi Electric 800 Series Instruction Manual page 35

(2) Operation
Example) Operation at power-ON
Home position return
(for the first-time positioning)
Home position
(stored)
Positioning
First time After the home position return operation is performed (the home position data is retained), positioning starts.
The home position return operation is not required regardless of the ON/OFF of the power supply.
Second time and onward
To change the home position, perform the home position return operation again.
• When the amount of shift from the home position to one direction exceeds the maximum possible position shift amount, LHP
(multi-turn count excess) warning is generated. As the home position data is lost, perform the home position return again.
• When any of the following operations is performed, the home position data is lost. Perform the home position return again.
1) The absolute position control is disabled (Pr.419  "1110") and then enabled again.
2) The electronic gear (Pr.420 and Pr.421) is changed.
3) The encoder rotation direction is changed.
4) The LHP warning is generated.
• When the home position return is performed while Pr.1282 = "4" (ignoring the home position), set a value other than "4" in
Pr.1282 after the home position return is completed.
• While the absolute position control is valid, the roll feed mode is invalid regardless of the Pr.1293 setting.
• When the absolute position control is valid and the home position return is not completed, the position shift distance after
power-ON or inverter reset is monitored and the value is displayed in the position command, current position, and current
position 2. When the home position return is completed, the value indication is reset to "0".
Position at power-on
(for the second-time and
onward positioning)
Positioning operation
Target position
Operation
POSITION CONTROL FUNCTION
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