Mitsubishi Electric 800 Series, Instruction Manual, Page: 216 / 727

Position control under vector control
PARAMETERS
215
5
 Example 3 of positioning operation by point tables (variable speed
operation)
• The maximum frequency can be changed during positioning operation. Use as many point tables as the number of
maximum speeds to be set.
• The figure below shows an operation example when the following settings are made for point tables.
• Set "0" as the dwell time to perform variable speed operation.
 Return to home position during point table positioning
• Home position return is performed to match the command coordinates with the machine coordinates.
• The returned home position can be set as point 0, and positioning operation is available using this.
• Home position return procedure
1) Set parameters related to home position return.
• Set the home position return method ( Pr.1282 ).
• Set the speed for home position return operation ( Pr.1283 ).
• Set the creep speed for home position return operation ( Pr.1284 ).
• Set the home position return shift amount if necessary ( Pr.1286

10000 + Pr.1285 ).
• Set the post proximity dog travel distance if necessary ( Pr.1288

10000 + Pr.1287 ).
2) Turn OFF all point table selections.
• Turn OFF all RH, RM, RL and REX signals.
3) Turn ON the Pre-excitation/servo ON (LX) signal.
4) Turn ON the start signal (STF or STR).
• Home position return is performed according to the settings.
NOTE
• The setting values of the point table 1 are used as acceleration/deceleration time.
• After turning ON the start signal, only the setting values of
Pr.1283 Home position return speed or Pr.1284 Home position
return creep speed can be changed.
• Perform home position return at the motor switchover.
Point
table
Target position
Maximum
speed (Hz)
Acceleration
time (s)
Deceleration
time (s)
Dwell time
(ms)
Auxiliary function
Upper Lower
1 5 0 30 1 1 0 1 (absolute position, continuous)
2 3 0 20 Invalid Invalid 0 11 (incremental position, individual)
3 10 0 10 Invalid Invalid 0 1 (absolute position, continuous)
4 6 0 5 Invalid Invalid 0 10 (incremental position, individual)
0
30 Hz
(
Pr.4 )
Time
Position command
speed
STF
Acceleration time (1 s)
of point table 1
20 Hz
(
Pr.5 )
10 Hz
(
Pr.6 )
5 Hz
( Pr.24 )
Deceleration time (1 s)
of point table 1
Position feed length
50000
50000 80000 100000 160000 0
30000 20000 60000
RH
RM
RL
Servo ON
(LX)
ON
ON
ON