Mitsubishi Electronics QD75P Stop command processing for deceleration stop function, Control

12 CONTROL SUB FUNCTIONS

12.7.10 Stop command processing for deceleration stop function

MELSEC-Q

The "stop command processing for deceleration stop function" is provided to set the deceleration curve if a stop cause occurs during deceleration stop processing (including automatic deceleration).

This function is valid for both automatic trapezoidal and S-pattern acceleration/deceleration processing methods.

(For the stop cause, refer to Section 1.2.3 Outline of stopping.)

The "stop command processing for deceleration stop function" performs the following two operations:

(1) Deceleration curve re-processing

Re-processes a deceleration curve starting from the speed at stop cause occurrence to stop, according to the preset deceleration time.

(2) Deceleration curve continuation

Continues the current deceleration curve after a stop cause has occurred.

This section explains the "stop command processing for deceleration stop function" as follows:

[1]Control

[2]Precautions for control

[3]Setting method

[1]Control

The operation of "stop command processing for deceleration stop function" is explained below.

(1) Deceleration curve re-processing

A deceleration curve is re-processed starting from the speed at stop cause occurrence to stop, according to the preset deceleration time.

If a stop cause occurs during automatic deceleration of position control, the deceleration stop processing stops as soon as the target has reached the positioning address specified in the positioning data that is currently executed.

Stop cause

Voccurrence

Deceleration stop

processing (automatic

deceleration) start

Deceleration curve according to preset deceleration time

Immediate stop at the specified positioning address

Deceleration curve when stop cause does not occur

t

Fig. 12.53 Deceleration curve re-processing operation (for position control or S-pattern

acceleration/deceleration processing)

12 - 96