Mitsubishi Electric 800 Series Instruction Manual page 216

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.
Target position
Point
table
Upper Lower
1 5 0
2 3 0
3 10 0
4 6 0
Position command
speed
0
Position feed length
Servo ON
(LX)
STF
RH
RM
RL
• 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.
Maximum Acceleration
speed (Hz) time (s)
30 1
20 Invalid
10 Invalid
5 Invalid
Acceleration time (1 s)
of point table 1
30 Hz
(Pr.4)
20 Hz
(Pr.5)
50000
0 50000
ON
Position control under vector control
Deceleration Dwell time
time (s) (ms)
1 0
Invalid 0
Invalid 0
Invalid 0
Deceleration time (1 s)
of point table 1
10 Hz
(Pr.6)
30000 20000
80000 100000
ON
ON
Auxiliary function
1 (absolute position, continuous)
11 (incremental position, individual)
1 (absolute position, continuous)
10 (incremental position, individual)
5 Hz
(Pr.24)
Time
60000
160000
PARAMETERS
5
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