Mitsubishi Electric 800 Series Instruction Manual page 219

Position control under vector control
Pr.1282 Home position
Setting return method
Count type front end
6
reference
NOTE
• Home position return automatic back-off function
In a system that uses home position return with proximity dog, if the home position return is commanded while the motor is in
a position within the proximity dog, the motor moves out of the proximity dog once, then starts deceleration to stop when it
comes to the proximity dog again. The home position return is performed automatically after that.
Home position return error
• If home position return is not normally completed, the following warnings appear on the operation panel.
Operation panel
indication
HP1 Home position return setting error
HP2 Home position return uncompleted
Home position return parameter
HP3
setting error
• The Home position return failure (ZA) signal is output while the home position return warning is occurring. To use the ZA
signal, set "56 (positive logic) or 156 (negative logic)" in any of Pr.190 to Pr.196 (Output terminal function selection) to
assign the function.
218
PARAMETERS
Deceleration starts at the front end of the proximity dog, and the position is shifted by the post-
dog travel distance and home position shift distance. The position after the shifts is set as the
home position.
Set pulses required for changing the speed from the home position speed to the creep speed
or more as the total of the post-dog travel distance and home position shift amount.
Position command
speed
0
Proximity dog
signal (X76)
Point table selection
signal
Servo-ON (LX)
Start signal (STF)
Home position
return speed
Proximity dog
X76
Name
• The home position setting has failed.
• Start signal for the point table positioning has turned ON without completing
the home position return.
• The proximity dog signal is turned OFF during transition from the home
position return speed to the creep speed when home position return is
performed in the dog type or dog type back end reference.
• The position command is given for the motor to reach the post-dog travel
distance during transition from the home position return speed to the creep
speed when home position return is performed in the count type.
• The position command is given for the motor to reach the total of the post-
dog travel distance and home position shift distance during deceleration from
the creep speed after the proximity dog signal is turned OFF in the dog type
back end reference.
• The speed did not reach the creep speed in the count type with front end
reference.
• An unavailable home position return method is selected.
Description
Point table 1
acceleration time Home position
return speed
Creep speed
Home position
Home position return start position
Point table 1
deceleration time travel distance
Home position
shift amount
Creep speed
Proximity dog
Cause
Post-dog
+
Home
position
Time