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7 AUXILIARY AND APPLIED FUNCTIONS
7.5 Speed-Torque Control
■
Operation for "Position control mode
torque control mode switching"
When the mode is switched from position control mode to torque control mode, the command torque immediately after
switching is the torque set in "torque initial value selection at control mode switching".
When the servo parameter "POL reflection selection at torque control (PC29)" is set to "0: Valid" and "Torque
initial value selection at control mode switching" is set to "1: Feedback torque", a warning (error code: 0A55H)
will occur at control mode switching, and the command value immediately after switching is the same as the
case of selecting "0: Command torque". If the feedback torque is selected, set "1: Invalid" in the servo
parameter "POL reflection selection at torque control (PC29)".
When the mode is switched from torque control mode to position control mode, the command position immediately after
switching is the current feed value at switching.
The following chart shows the operation timing.
Torque initial value selection at
control mode switching
Command torque to servo amplifier immediately after switching from position control mode
to torque control mode
0: Command torque
Immediately after switching the control mode, the value of torque command device is the torque to servo amplifier
regardless of the command torque time constant.
1: Feedback torque
Motor current value received from servo amplifier at switching is the torque to servo amplifier.
t
Torque
0
20.0%
30.0%
Position control mode
Position control mode
Torque control mode
Control mode switching
request device
Control mode setting device
0
Torque command device
0
200
300
0
0
50000
[0, 0]
[0, 1]
[0, 0]
OFF
ON
6 to 11ms
6 to 11ms
[St.1040] Start accept flag
(R: n/Q: M2001+n)
Speed command device
(Speed limit command value)
Control mode (b2, b3)
([Md.108] Servo status1
(R: 48n/Q: #8010+20n))
OFF
ON
20: Torque control mode
0: Position control mode
Summary of Contents for MELSEC iQ-R16MTCPU
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