Mitsubishi Electronics QD75D, QD75P user manual Precautions for control

12CONTROL SUB FUNCTIONS

(2)Deceleration curve continuation

MELSEC-Q

The current deceleration curve is continued after a stop cause has occurred.

If a stop cause occurs during automatic deceleration of position control, the deceleration stop processing may be complete before the target has reached the positioning address specified in the positioning data that is currently executed.

V Stop cause occurrence

Deceleration stop

processing (automatic

deceleration) start

t

Fig. 12.54 Deceleration curve continuation operation (for position control or S-pattern

acceleration/deceleration processing)

[2]Precautions for control

(1)In manual control (JOG operation, inching operation, manual pulse generator operation), the stop command processing for deceleration stop function is invalid.

(2)The stop command processing for deceleration stop function is valid when "0: Normal deceleration stop" is set in " Pr.37 Stop group 1 sudden stop selection" to " Pr.39 Stop group 3 sudden stop selection" as the stopping method for stop cause occurrence.

(3)The stop command processing for deceleration stop function is invalid when "1: Sudden stop" is set in " Pr.37 Stop group 1 sudden stop selection" to

"Pr.39 Stop group 3 sudden stop selection". (A deceleration curve is re- processed, according to the " Pr.36 Sudden stop deceleration time" (starting from the speed at stop cause occurrence to a stop))

In the position control (including position control of speed/position changeover control or position/speed changeover control) mode, positioning may stop immediately depending on the stop cause occurrence timing and

"Pr.36 Sudden stop deceleration time" setting.

	Stop cause occurrence			Stop cause occurrence
V	(Sudden stop cause)		V
		Deceleration curve according		(Sudden stop cause)	Deceleration curve
					according to sudden
		to sudden stop deceleration time
					stop deceleration time
	Deceleration stop	Deceleration curve when		Deceleration stop	Deceleration curve
processing (automatic				processing (automatic	when stop cause
		stop cause does not occur
	deceleration) start			deceleration) start	does not occur
		t			t
(Sudden stop in front of the specified positioning address)				(Immediate stop at the specified positioning address)

Fig. 12.55 Sudden stop operation (for position control or S-pattern acceleration/deceleration processing)

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