Mitsubishi Electric Melservo-Jet MR-JET-G Series User Manual page 56

■Method -2 and -34 (Count type homing)
For the count type homing, after the front end of the proximity dog is detected, the position is shifted by the
distance set in the travel distance after proximity dog. Then, the first Z-phase is set as the home position.
Therefore, when the on-time of the proximity dog is 10 ms or more, the length of the proximity dog has no
restrictions. Use this homing when the dog type homing cannot be used because the length of the proximity
dog cannot be reserved or other cases.
The following figure shows the operation of Homing method -2. The homing direction of Homing method -34 is opposite to that
of Homing method -2.
Statusword bit 10
Target reached
Statusword bit 12
Homing attained
Servo motor speed
Z-phase
DOG (Proximity dog)
Controlword bit 4
Homing operation start
*1 After the front end of the proximity dog is detected, if the distance after proximity dog is traveled without reaching the creep speed, [AL.
090] occurs. Set the travel distance after proximity dog enough for the servo motor to decelerate from the homing speed to the creep
speed.
• When homing is started from the proximity dog
Servo motor speed
The homing start position is automatically moved back to the position
just before the proximity dog, and homing starts from here.
• When the servo motor returns at the stroke end
Servo motor speed
Homing starts from here.
*1 This cannot be used with the software limit.
2 CONTROL MODE
54
2.1 Control mode
ON
OFF
ON
OFF
Acceleration time constant
Homing speed
Forward
rotation
0 r/min
3 ms or shorter
Reverse
rotation
Travel distance after
proximity dog
ON
OFF
ON
OFF
ON
OFF
Homing direction
0 r/min
Reverse
rotation
Homing direction
Forward
Homing start position
rotation
0 r/min
Reverse
rotation
Deceleration time constant
*1
Proximity dog
Proximity dog
Homing start position
Proximity dog
Home position
shift distance
Creep speed
Homing position data
*1
Stroke end