Mitsubishi Electric 800 Series Instruction Manual page 479

(A) Application parameters
Orientation from the running status (under V/F control, Advanced
magnetic flux vector control)
1) When the orientation command (X22) turns on, the motor speed decreases to the Pr.351 Orientation speed. (Pr.351
initial value: 2Hz)
2) After the speed reaches the orientation speed, the speed further decreases to the Pr.352 Creep speed as soon as the
current position pulse reaches the Pr.353 Creep switchover position. (Pr.352 is initially set to "0.5 Hz", Pr.353 is
initially set to "511")
3) Moreover, as soon as the current position pulse reaches the Pr.354 Position loop switchover position, control is
changed to the position loop. (Pr.354 is initially set to "96")
4) After the motor moves into the position loop, the motor decelerates and stops by the DC injection brake as soon as the
current position pulse reaches the Pr.355 DC injection brake start position. (Pr.355 is initially set to "5")
5) When the motor stops in Pr.357 Orientation in-position zone, the orientation complete (ORA) signal is output after
Pr.363 Completion signal output delay time. If the motor does not stop within the in-position width because of
external force, etc., the ORA signal turns OFF after the time set in Pr.363. (Pr.357 is initially set to "5", Pr.363 is initially
set to "0.5 s")
6) If the orientation is not completed continuously in Pr.365 Orientation limit after passing the creep switchover position,
the orientation fault signal (ORM) is output.
7) After the orientation start, if the motor is stopped by external force, etc. before reaching the in-position width and
therefore the ORA signal has not been output, the ORM signal is output after the Pr.364 Encoder stop check time.If
the motor is moved out of the in-position width by external force, etc. after the ORA signal has been output once, the
ORA signal turns OFF after the set time in Pr.363. If the orientation is not completed within the time set in Pr.364, the
ORM signal is output.
8) If the ORA and ORM signals have been output once, but the start signal (STF or STR) is turned OFF while the X22
signal is ON, the ORA or ORM signal will be output again after Pr.366 Recheck time.
9) The ORA and ORM signals cannot be output while the X22 signal is OFF.
NOTE
• When the orientation command turns OFF while the start signal is ON, the speed accelerates to the command speed.
• If hunting of the motor shaft occurs during orientation stop, set a larger value in Pr.354 or a smaller value in Pr.352 to prevent
it.
Main spindle speed (encoder)
Start signal (STF, STR)
Orientation command (X22)
Current position signal
DC injection brake
Orientation complete signal (ORA)
478
PARAMETERS
Orientation
speed
Creep switchover position
Pr.351
Pr.352
0
Origin signal
Position loop
Home position
Orientation stop position command
DC injection brake
Position loop switchover position
Creep
speed
Orientation speed (set with Pr.351)
1)
2)
OFF
ON
DC injection
brake start
position
(set with Pr.355)
Creep speed (set with Pr.352)
3) 4)
OFF
ON
OFF
Creep switchover position
(set with Pr.353)
Position loop switchover
(set with Pr.354)
Stop position command
OFF OFF
ON
5)
OFF OFF
ON
Time