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9 MAJOR POSITIONING CONTROL
In speed control
Speed
Current feed value during speed control start is maintained
(a) Current feed value not updated
Current feed value during 2-axis speed control
The following table shows the "
control corresponding to the "
settings. (Note that the reference axis setting values are used for parameters.)
" Pr.21 Current feed value during speed
control" setting
0: Do not update current feed value
1: Update current feed value
2: Zero clear current feed value
Speed
t
Current feed value is updated
(b) Current feed value updated
Restrictions
(1) Set "Positioning complete" in "
"Continuous path control not possible (error code: 516)" will occur and the
operation cannot start if "continuous positioning control" or "continuous path
control" is set.
("Continuous positioning control" and "continuous path control" cannot be set
in speed control.)
(2) Set the WITH mode in "
an M code. The M code will not be output, and the M code ON signal will not
turn ON if the AFTER mode is set.
(3) Set the "reference axis speed" in "
method". An "Interpolation mode error (error code: 523)" will occur and the
operation cannot start if a composite speed is set.
(4) When either of two axes exceeds the speed limit, that axis is controlled with
the speed limit value. The speeds of the other axes are limited at the ratios of
Da.8
"
Command speed".
(Examples)
Setting item
Pr.8
Speed limit value
Da.8
Command speed
With the settings shown above, the operation speed in speed control is as
follows.
Axis 1: 4000.00 mm/min (Speed is limited by
Axis 2: 3000.00 mm/min (Speed is limited at an ratio of an axis 1 command
speed to an axis 2 command speed).
Md.20
Current feed value" during 2-axis speed
Pr.21
Current feed value during speed control"
The current feed value at speed control start
is maintained.
The current feed value is updated.
The current feed value is fixed at 0.
In speed control
t
Da.1
Operation pattern". An axis error
Pr.18
M code ON signal output timing" when using
Pr.20
Interpolation speed designation
Axis
Axis 1 setting
4000.00mm/min
8000.00mm/min
9 - 71
MELSEC-Q
Md.20 Current feed value
In speed control
Speed
0
(c) Current feed value zero cleared
Axis 2 setting
5000.00mm/min
6000.00mm/min
Pr.8
).
t
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Troubleshooting
