12 - 45
MELSEC-Q
12 CONTROL SUB FUNCTIONS
(5) A warning "Deceleration/stop speed change (warning code: 500)" occurs
and the speed cannot be changed in the following cases.
•
During deceleration by a stop command
•
During automatic deceleration during positioning control
(6) A warning "Speed limit value over (warning code: 501)" occurs and the
speed is controlled at the " Pr.8 Speed limit value" when the value set in
"
Cd.14
New speed value" is equal to or larger than the " Pr.8 Speed limit
value".
(7) When the speed is changed during interpolation control, the required speed
is set in the reference axis.
(8) When carrying out consecutive speed changes, be sure there is an interval
between the speed changes of 100ms or more.
(If the interval between speed changes is short, the QD75MH will not be
able to track, and it may become impossible to carry out commands
correctly.)
(9) When a speed change is requested simultaneously for multiple axes, change
the speed in the ascending axis number order.
(10) Speed change cannot be carried out during the machine OPR. A request for
speed change is ignored.
(11) When deceleration is started by the speed change function, the deceleration
start flag does not turn ON.
[3] Setting the speed change function from the PLC CPU
The following shows the data settings and PLC program example for changing
the control speed of axis 1 from the PLC CPU. (In this example, the control
speed is changed to "20.00mm/min".)
(1) Set the following data.
(Use the start time chart shown in section (2) below as a reference, and set
using the PLC program shown in section (3).)
Buffer memory address
Setting item
Setting
value
Setting details
Axis
1
Axis
2
Axis
3
Axis
4
Cd.14
New speed value
2000
Set the new speed.
1514
1515
1614
1615
1714
1715
1814
1815
Cd .15
Speed change
request
1
Set "1: Change the speed".
1516 1616 1716 1816
Refer to Section 5.7 "List of control data" for details on the setting details.
Содержание QD75MH1
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