Mitsubishi MELSEC QD75P User Manual page 512

Positioning module
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12 CONTROL SUB FUNCTIONS
Positioning start signal
[Y10, Y11, Y12, Y13]
BUSY signal
[XC,XD,XE,XF]
Cd. 14 New speed value
Cd. 15 Speed change request
Positioning operation
Speed change 0 flag
Md. 31 status: b10
(4) When the speed is changed by setting "
the operation is carried out as follows.
A deceleration stop is carried out, and the speed change 0 flag
(
Md.31
Status: b10) turns ON.
(During interpolation control, the speed change 0 flag on the reference axis
side turns ON.)
The axis stops, but "
the BUSY signal remains ON. (If a stop signal is input, the BUSY signal
will turn OFF, and "
"stopped".)
In this case, setting the "
will turn OFF the speed change 0 flag (
continued operation.
ON
OFF
ON
OFF
0
ON
OFF
OFF
Fig. 12.25 Speed change at new speed value "0"
(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 "
"
Cd.14
New speed value" is equal to or larger than the "
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 QD75 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.
12 - 36
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Cd.14
Md.26
Axis operation status" does not change, and
Md.26
Axis operation status" will change to
Cd.14
New speed value" to a value besides "0"
Md.31
1000
ON
Pr.8
Speed limit value" when the value set in
MELSEC-Q
New speed value" to "0",
Status: b10), and enable
Pr.8
Speed limit

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