Home Position Return Mode; Summary Of Home Position Return - Mitsubishi Electric MELSERVO-J4 Instruction Manual

5. HOW TO USE THE PROGRAM

5.4 Home position return mode

5.4.1 Summary of home position return

A home position return is performed to match the command coordinates with the machine coordinates.
Under the incremental method, each power-on of the input power supply requires the home position return.
In the absolute position detection system, once you have performed the home position return at machine
installation, the current position will be retained even if the power supply is shut off. Therefore, the home
position return is unnecessary when the power supply is switched on again.
This section shows the home position return methods of the servo amplifier. Select the optimum method
according to the configuration and uses of the machine.
This servo amplifier has the home position return automatic retract function. When the machine stops
beyond or on a proximity dog, this function automatically moves the machine back to the proper position to
perform the home position return. Manually moving the machine by the JOG operation or others is
unnecessary.
Point
Before performing the home position return, make sure that the limit switch
operates.
Check the home position return direction. An incorrect setting will cause a
reverse running.
Check the input polarity of the proximity dog. Otherwise, it may cause an
unexpected operation.
When using an incremental encoder, make use that the Z-phase has been
passed through once before the home position return. Z-phase unpassed will
trigger [AL. 90.5 Home position return incomplete warning].
The dog type last/dogless Z-phase reference home position return cannot be
used with the following operation modes.
Fully closed loop control mode using a incremental linear encoder
Linear servo motor control mode using a incremental linear encoder
Direct drive motor control mode
Setting [Pr. PT04 Home position return type] to "_ _ _ 8" or "_ _ _ A" will trigger
[AL. 37 Parameter error].
5 - 37