User`s manual

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MELSEC-Q
11 SUB FUNCTIONS
11.5 Acceleration/deceleration processing function
The "acceleration/deceleration processing function" is designed to adjust
acceleration/deceleration when OPR control, positioning control or JOG operation is
performed.
Adjusting the acceleration/deceleration processing according to control enables finer
control.
The acceleration/deceleration adjusting items that can be set are "bias speed at start",
"target speed", "acceleration time" and deceleration time".
The following will be explained for the "acceleration/deceleration processing function".
[1] Control details
[2] Precautions for control
[1] Control details
The following is the operation of the acceleration/deceleration processing
function of the QD70.
t
V
Pr. 6
Target speed
" Bias speed at start"
is other than 0
" Bias speed at start" is 0
(Set deceleration time) = (actual deceleration time)(Set acceleration time) = (actual acceleration time)
Pr. 6
Pr. 6
(Set acceleration/deceleration time) = (actual acceleration/deceleration time) if "
Pr. 6
Bias speed at start" is either 0 or other
than 0.
•
The set acceleration/deceleration time is the actual acceleration/deceleration time and "
Pr. 5
Speed limit value" does not
influence the acceleration/deceleration time.
•
The acceleration/deceleration time slope varies if the setting of "
Pr. 6
Bias speed at start" is changed.
•
The "set acceleration time" and "set deceleration time" are available individually for the functions
(For details, refer to "CHAPTER 4 DATA USED FOR POSITIONING CONTROL".)
<Jog operation>
Set acceleration time:
JOG. 1
JOG ACC time, set deceleration time:
JOG. 2
JOG DEC time
<Positioning control (Operation pattern: Positioning termination, continuous positioning control)>
Set acceleration time:
Da. 3
ACC/DEC time, set deceleration time:
Da. 4
DEC/STOP time
Fig. 11.6 Operation of acceleration/deceleration processing function of QD70
Slope of acceleration/deceleration
The slope of acceleration/deceleration is calculated by the following expression.
(Target speed) - (bias speed at start)
(Set acceleration time/set deceleration time)
POINT
For the QD70, the acceleration/deceleration slope is determined by the three data
of "bias speed at start", "target speed" and "acceleration/deceleration time". Fully
note this when changing the setting values.
(A sharp acceleration/deceleration slope may affect the machine.)