Mitsubishi Electronics QD75P, QD75D user manual Precautions during operation

12CONTROL SUB FUNCTIONS

[2]Precautions during operation

MELSEC-Q

(1)If the positioning movement direction from the stop position to a new target position is reversed, stop the operation once and then position to the new target position. (Refer to Fig. 12.41 (c).)

(2)If a command speed exceeding the speed limit value is set to change the command speed, a warning will be given, and the new command speed will be the speed limit value (warning code: 501).

Also, if the command speed change disables the remaining distance to the target value from being assured, a warning will be given (warning code: 509).

(3)During interpolation control, a target position change request given is ignored and a warning (warning code: 518) occurs if a new target position value (address) is outside the software stroke limit range, if the axis is decelerating to a stop, or if the operation pattern is continuous path control.

(4)When a command speed is changed, the current speed is also changed. When the next positioning speed uses the current speed in the continuous positioning, the next positioning operation is carried out at the new speed value. When the speed is set with the next positioning data, that speed becomes the current speed and the operation is carried out at the current speed.

(5)When a target position change request is given during automatic deceleration in position control, positioning control to a new position is exercised after the axis has stopped once if the moving direction is reversed. If the moving direction is not reversed, the axis is accelerated to the command speed again and positioned to the new position.

(6)If the constant speed status is regained or the output is reversed by a target position change made while " Md.48 Deceleration start flag" is ON, the deceleration start flag remains ON. (For details, refer to Section 12.7.9.)

POINT

When carrying out the target position change continuously, take an interval of 100 ms or longer between the times of the target position changes. Also, take an interval of 100 ms or longer when the speed change is carried out after changing the target position or the target position change is carried out after the speed change.

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