Mitsubishi MELSEC-Q QD77MS, User Manual

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Chapter 9 Major Positioning Control
Current feed value during 1-axis speed control
The following table shows the " Md.20 Current feed value" during 1-axis speed
control corresponding to the "
Pr.21
Current feed value during speed control"
settings.
Pr.21 Current feed value during speed
control" setting
Md.20 Current feed value
0: Do not update current feed value
The current feed value at speed control start
is maintained.
1: Update current feed value The current feed value is updated.
2: Zero clear current feed value The current feed value is fixed at 0.
V
t
In speed control
Current feed value during speed control start is maintained
(a) Current feed value not updated
t
Current feed value is updated
(b) Current feed value updated
(c) Current feed value zero cleared
t
0
In speed control
In speed control
V V
Restrictions
(1) Set "Positioning complete" in " Da.1 Operation pattern". An axis error
"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 in "
Da.1 Operation pattern".
("Continuous positioning control" and "continuous path control" cannot be set
in speed control.)
(2) Set the WITH mode in " Pr.18 M code ON signal output timing" when using
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) An error "No command speed (error code: 503)" will occur if the current speed
(-1) is set in "
Da.8 Command speed".
(4) The software stroke limit check will not carried out if the control unit is set to
"degree".