Mitsubishi Electric MELSEC-Q QD75M, User Manual

Page: 135 / 858

5 - 44
MELSEC-Q
5 DATA USED FOR POSITIONING CONTROL
Pr.42 External command function selection
Select a command with which the external command signal should be associated.
0: External positioning start
The external command signal input is used to start a positioning
operation.
1: External speed change request
The external command signal input is used to change the speed
in the current positioning operation. The new speed should be set
in the "
Cd.14
Speed change value"
2: Speed-position, position-speed switching request
The external command signal input is used to switch from the
speed control to the position control while in the speed-position
switching control mode, or from the position control to the speed
control while in the position-speed switching control mode.
To enable the speed-position switching control, set the
"
Cd.24
Speed-position switching enable flag" to "1".
To enable the position-speed switching control, set the
"
Cd.26
Position-speed switching enable flag" to "1".
3: Skip request
The external command signal input is used skip the current
positioning operation.
POINT
To enable the external command signal, set the " Cd.8 External command enable"
to "1".
Pr.201 Restart allowable range when servo OFF to ON
(1) What is the restart function when servo OFF to ON ?
The QD75 restart function when servo OFF changes to ON, performs
continuous positioning operation (positioning start, restart) when the servo is
switched from OFF to ON in the stopped state (including servo emergency
stop).
Restart when servo OFF changes to ON can be performed when the
difference between the last command position for the QD75 when it stopped
and the present value when servo OFF changed to ON, is less than the value
set in the buffer memory for the restart allowable range setting.
(a) Servo emergency stop processing
1) For stop caused by a servo emergency stop signal, positioning
operation is judged as stopped and can be restarted if the difference
between the last command position for the QD75 when the servo
stop signal turned ON and present value at the time the servo stop
signal turned OFF is lower than the value set in the buffer memory
for the restart allowable range setting.