Mitsubishi Electric MELSERVO MR-J4-03A6-RJ, Instruction Manual

Page: 244 / 610

5. HOW TO USE THE PROGRAM
5 - 37
5.4 Home position return mode
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 proximity dog input polarity. Otherwise, it may cause an overrun and
malfunction.
In the following cases, make sure that the Z-phase has been passed through
once before performing a home position return.
When an incremental linear encoder is used in the linear servo motor control
mode
When an incremental external encoder is used in the fully closed loop control
mode
When a servo amplifier is used in the DD motor control mode
Z-phase unpassed will trigger [AL. 90.5 Home position return incomplete
warning].
For servo amplifiers with software version B6 or earlier, the dog type last Z-
phase reference home return and dogless Z-phase reference home position
return cannot be used in the following operation modes.
Fully closed loop control mode using an incremental linear encoder
Linear servo motor control mode using an 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].
5.4.1 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.
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